diff --git a/.github/workflows/job-mutation-tests.yml b/.github/workflows/job-mutation-tests.yml
index dcad210a07..3933ef1554 100644
--- a/.github/workflows/job-mutation-tests.yml
+++ b/.github/workflows/job-mutation-tests.yml
@@ -28,6 +28,8 @@ jobs:
           dependencies: "locked"
           coverage: "pcov"
           cache-key-suffix: "-locked"
+          extensions: ':psr, apcu, bcmath, dom, hash, json, mbstring, xml, xmlwriter, xmlreader, zlib'
+          ini-values: 'memory_limit=-1, apc.enable_cli=1'
 
       - name: "Create cache directory"
         run: "mkdir -p var/infection/cache"
diff --git a/.github/workflows/job-tests.yml b/.github/workflows/job-tests.yml
index ce524dbfdc..230dbfb600 100644
--- a/.github/workflows/job-tests.yml
+++ b/.github/workflows/job-tests.yml
@@ -96,8 +96,8 @@ jobs:
           php-version: "${{ matrix.php-version }}"
           dependencies: "${{ matrix.dependencies }}"
           coverage: ${{ matrix.php-version == '8.3' && 'pcov' || 'none' }}
-          extensions: ':psr, bcmath, dom, hash, json, mbstring, xml, xmlwriter, xmlreader, zlib, curl, pgsql, grpc, protobuf'
-          ini-values: 'memory_limit=-1, post_max_size=32M, upload_max_filesize=32M'
+          extensions: ':psr, apcu, bcmath, dom, hash, json, mbstring, xml, xmlwriter, xmlreader, zlib, curl, pgsql, grpc, protobuf'
+          ini-values: 'memory_limit=-1, post_max_size=32M, upload_max_filesize=32M, apc.enable_cli=1'
           apt-packages: "build-essential autoconf automake libtool protobuf-compiler libprotobuf-c-dev"
           pie-extensions: "flow-php/pg-query-ext:1.x-dev"
 
diff --git a/.nix/php/lib/php.ini.dist b/.nix/php/lib/php.ini.dist
index 488665798b..ba9900777c 100644
--- a/.nix/php/lib/php.ini.dist
+++ b/.nix/php/lib/php.ini.dist
@@ -9,4 +9,7 @@ file_uploads = On
 max_file_uploads = 20
 short_open_tag = off
 opcache.enable=1
-opcache.enable_cli=0
\ No newline at end of file
+opcache.enable_cli=0
+apc.enabled=1
+apc.enable_cli=1
+apc.shm_size=128M
\ No newline at end of file
diff --git a/.nix/pkgs/flow-php/package.nix b/.nix/pkgs/flow-php/package.nix
index 6d0af49a4d..fd6c7db0a9 100644
--- a/.nix/pkgs/flow-php/package.nix
+++ b/.nix/pkgs/flow-php/package.nix
@@ -24,6 +24,7 @@ let
     with all;
     enabled
         ++ [
+            apcu
             bcmath
             dom
             mbstring
diff --git a/src/core/etl/composer.json b/src/core/etl/composer.json
index 55f4df2e71..5f871f3008 100644
--- a/src/core/etl/composer.json
+++ b/src/core/etl/composer.json
@@ -23,6 +23,7 @@
         "symfony/string": "^6.4 || ^7.4 || ^8.0"
     },
     "suggest": {
+        "ext-apcu": "Allows using ApcuCache as a pipeline cache implementation",
         "ext-bcmath": "BCMath extension for PHP for more precise calculations"
     },
     "require-dev": {
diff --git a/src/core/etl/src/Flow/ETL/Cache/Implementation/ApcuCache.php b/src/core/etl/src/Flow/ETL/Cache/Implementation/ApcuCache.php
new file mode 100644
index 0000000000..cc206e0e3c
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/Cache/Implementation/ApcuCache.php
@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Cache\Implementation;
+
+use APCUIterator;
+use Flow\ETL\Cache;
+use Flow\ETL\Exception\KeyNotInCacheException;
+use Flow\ETL\Exception\RuntimeException;
+use Flow\ETL\Rows;
+use Generator;
+
+use function apcu_delete;
+use function apcu_enabled;
+use function apcu_exists;
+use function apcu_fetch;
+use function apcu_store;
+use function extension_loaded;
+use function preg_quote;
+use function sprintf;
+
+final readonly class ApcuCache implements Cache
+{
+    public function __construct(
+        private string $namespace = 'flow_php_cache',
+    ) {
+        if (!extension_loaded('apcu') || !apcu_enabled()) {
+            throw new RuntimeException(
+                'ApcuCache requires the APCu extension (ext-apcu) with apc.enabled=1'
+                . (PHP_SAPI === 'cli' ? ' and apc.enable_cli=1' : ''),
+            );
+        }
+    }
+
+    public function clear(): void
+    {
+        $iterator = new APCUIterator('/^' . preg_quote($this->namespace . ':', '/') . '/');
+
+        apcu_delete($iterator);
+    }
+
+    public function delete(string $key): void
+    {
+        apcu_delete($this->namespacedKey($key));
+    }
+
+    public function get(string $key): Rows
+    {
+        $success = false;
+
+        // @mago-ignore analysis:mixed-assignment
+        $value = apcu_fetch($this->namespacedKey($key), $success);
+
+        if (!$success) {
+            throw new KeyNotInCacheException($key);
+        }
+
+        if (!$value instanceof Rows) {
+            throw new RuntimeException(sprintf(
+                'Cache entry for key "%s" is corrupted or was not written by ApcuCache.',
+                $key,
+            ));
+        }
+
+        return $value;
+    }
+
+    public function has(string $key): bool
+    {
+        return (bool) apcu_exists($this->namespacedKey($key));
+    }
+
+    /**
+     * @throws KeyNotInCacheException
+     *
+     * @return Generator<int, Rows>
+     */
+    public function read(string $key): Generator
+    {
+        yield $this->get($key);
+    }
+
+    public function set(string $key, Rows $value): void
+    {
+        $result = apcu_store($this->namespacedKey($key), $value);
+
+        if ($result === false) {
+            throw new RuntimeException(sprintf(
+                'Failed to store cache entry for key "%s" in APCu, the cache segment might be full.',
+                $key,
+            ));
+        }
+    }
+
+    private function namespacedKey(string $key): string
+    {
+        return $this->namespace . ':' . $key;
+    }
+}
diff --git a/src/core/etl/src/Flow/ETL/Config.php b/src/core/etl/src/Flow/ETL/Config.php
index a5ce3fbd49..cfe0dc1e99 100644
--- a/src/core/etl/src/Flow/ETL/Config.php
+++ b/src/core/etl/src/Flow/ETL/Config.php
@@ -7,6 +7,7 @@
 use Flow\Calculator\Calculator;
 use Flow\ETL\Config\Cache\CacheConfig;
 use Flow\ETL\Config\ConfigBuilder;
+use Flow\ETL\Config\Grouping\GroupingConfig;
 use Flow\ETL\Config\Sort\SortConfig;
 use Flow\ETL\Config\Telemetry\TelemetryConfig;
 use Flow\ETL\Filesystem\FilesystemStreams;
@@ -37,6 +38,7 @@ public function __construct(
         public SortConfig $sort,
         private ?Analyze $analyze,
         public TelemetryConfig $telemetry,
+        public GroupingConfig $grouping,
         private Calculator $calculator = new Calculator(),
     ) {}
 
diff --git a/src/core/etl/src/Flow/ETL/Config/ConfigBuilder.php b/src/core/etl/src/Flow/ETL/Config/ConfigBuilder.php
index d2eb6c4696..7d1b8701dd 100644
--- a/src/core/etl/src/Flow/ETL/Config/ConfigBuilder.php
+++ b/src/core/etl/src/Flow/ETL/Config/ConfigBuilder.php
@@ -9,6 +9,7 @@
 use Flow\ETL\Cache;
 use Flow\ETL\Config;
 use Flow\ETL\Config\Cache\CacheConfigBuilder;
+use Flow\ETL\Config\Grouping\GroupingConfigBuilder;
 use Flow\ETL\Config\Sort\SortConfigBuilder;
 use Flow\ETL\Config\Telemetry\TelemetryConfig;
 use Flow\ETL\Config\Telemetry\TelemetryOptions;
@@ -19,6 +20,7 @@
 use Flow\ETL\Pipeline\Optimizer\LimitOptimization;
 use Flow\ETL\RandomValueGenerator;
 use Flow\ETL\Row\EntryFactory;
+use Flow\ETL\Sort\ExternalSort\BucketsCache;
 use Flow\Filesystem\Filesystem;
 use Flow\Filesystem\FilesystemTable;
 use Flow\Floe\FloeSerializer;
@@ -34,6 +36,8 @@ final class ConfigBuilder
 {
     public readonly CacheConfigBuilder $cache;
 
+    public readonly GroupingConfigBuilder $grouping;
+
     public readonly SortConfigBuilder $sort;
 
     private ?Analyze $analyze;
@@ -68,6 +72,7 @@ public function __construct()
         $this->optimizer = null;
         $this->clock = null;
         $this->cache = new CacheConfigBuilder();
+        $this->grouping = new GroupingConfigBuilder();
         $this->sort = new SortConfigBuilder();
         $this->randomValueGenerator = new NativePHPRandomValueGenerator();
         $this->analyze = null;
@@ -86,7 +91,7 @@ public function analyze(Analyze $analyze): self
 
     public function build(EntryFactory $entryFactory = new EntryFactory()): Config
     {
-        $this->id ??= 'flow-php-' . $this->randomValueGenerator->string(32);
+        $id = $this->id ??= 'flow-php-' . $this->randomValueGenerator->string(32);
         $this->serializer ??= new FloeSerializer();
         $this->optimizer ??= new Optimizer(new LimitOptimization(), new BatchSizeOptimization(batchSize: 1000));
 
@@ -94,8 +99,10 @@ public function build(EntryFactory $entryFactory = new EntryFactory()): Config
         $optimizer = $this->optimizer;
         $dataframeName = $this->name ?? 'flow_dataframe';
 
+        $cacheConfig = $this->cache->build($this->fstab(), $this->telemetryConfig, $dataframeName);
+
         return new Config(
-            $this->id,
+            $id,
             $dataframeName,
             $this->version,
             $serializer,
@@ -105,10 +112,11 @@ public function build(EntryFactory $entryFactory = new EntryFactory()): Config
             $optimizer,
             $this->putInputIntoRows,
             $entryFactory,
-            $this->cache->build($this->fstab(), $this->telemetryConfig, $dataframeName),
+            $cacheConfig,
             $this->sort->build(),
             $this->analyze,
             $this->telemetryConfig ?? TelemetryConfig::default($this->getClock()),
+            $this->grouping->build($this->fstab(), $cacheConfig->localFilesystemCacheDir),
         );
     }
 
@@ -187,6 +195,33 @@ public function externalSortFilesystem(string $protocol): self
         return $this;
     }
 
+    /**
+     * @param int<1, max> $batchSize
+     */
+    public function groupingBatchSize(int $batchSize): self
+    {
+        $this->grouping->batchSize($batchSize);
+
+        return $this;
+    }
+
+    /**
+     * @param int<1, max> $bucketsCount
+     */
+    public function groupingBucketsCount(int $bucketsCount): self
+    {
+        $this->grouping->bucketsCount($bucketsCount);
+
+        return $this;
+    }
+
+    public function groupingCache(BucketsCache $cache): self
+    {
+        $this->grouping->cache($cache);
+
+        return $this;
+    }
+
     public function id(string $id): self
     {
         $this->id = $id;
diff --git a/src/core/etl/src/Flow/ETL/Config/Grouping/GroupingConfig.php b/src/core/etl/src/Flow/ETL/Config/Grouping/GroupingConfig.php
new file mode 100644
index 0000000000..cc0007d65f
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/Config/Grouping/GroupingConfig.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Config\Grouping;
+
+use Flow\ETL\Sort\ExternalSort\BucketsCache;
+
+final readonly class GroupingConfig
+{
+    /**
+     * @param int<1, max> $bucketsCount
+     * @param int<1, max> $batchSize
+     */
+    public function __construct(
+        public BucketsCache $cache,
+        public int $bucketsCount = 64,
+        public int $batchSize = 1000,
+    ) {}
+}
diff --git a/src/core/etl/src/Flow/ETL/Config/Grouping/GroupingConfigBuilder.php b/src/core/etl/src/Flow/ETL/Config/Grouping/GroupingConfigBuilder.php
new file mode 100644
index 0000000000..2db31c1be5
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/Config/Grouping/GroupingConfigBuilder.php
@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Config\Grouping;
+
+use Flow\ETL\Exception\InvalidArgumentException;
+use Flow\ETL\Sort\ExternalSort\BucketsCache;
+use Flow\ETL\Sort\ExternalSort\BucketsCache\FilesystemBucketsCache;
+use Flow\Filesystem\FilesystemTable;
+use Flow\Filesystem\Path;
+
+final class GroupingConfigBuilder
+{
+    /**
+     * @var int<1, max>
+     */
+    private int $batchSize = 1000;
+
+    /**
+     * @var int<1, max>
+     */
+    private int $bucketsCount = 64;
+
+    private ?BucketsCache $cache = null;
+
+    private string $filesystemMount = 'file';
+
+    /**
+     * @param int<1, max> $batchSize
+     */
+    public function batchSize(int $batchSize): self
+    {
+        // @mago-ignore analysis:impossible-condition,redundant-comparison
+        if ($batchSize < 1) {
+            throw new InvalidArgumentException('Batch size must be at least 1');
+        }
+
+        $this->batchSize = $batchSize;
+
+        return $this;
+    }
+
+    public function build(FilesystemTable $filesystemTable, Path $localFilesystemCacheDir): GroupingConfig
+    {
+        $cache = $this->cache ?? new FilesystemBucketsCache(
+            $filesystemTable->for($this->filesystemMount),
+            $localFilesystemCacheDir->suffix('/flow-php-group-by/'),
+            $this->batchSize,
+        );
+
+        return new GroupingConfig($cache, $this->bucketsCount, $this->batchSize);
+    }
+
+    /**
+     * @param int<1, max> $bucketsCount
+     */
+    public function bucketsCount(int $bucketsCount): self
+    {
+        // @mago-ignore analysis:impossible-condition,redundant-comparison
+        if ($bucketsCount < 1) {
+            throw new InvalidArgumentException('Buckets count must be greater than 0');
+        }
+
+        $this->bucketsCount = $bucketsCount;
+
+        return $this;
+    }
+
+    public function cache(BucketsCache $cache): self
+    {
+        $this->cache = $cache;
+
+        return $this;
+    }
+}
diff --git a/src/core/etl/src/Flow/ETL/DataFrame/GroupedDataFrame.php b/src/core/etl/src/Flow/ETL/DataFrame/GroupedDataFrame.php
index f4d2f48506..697d2bada2 100644
--- a/src/core/etl/src/Flow/ETL/DataFrame/GroupedDataFrame.php
+++ b/src/core/etl/src/Flow/ETL/DataFrame/GroupedDataFrame.php
@@ -21,15 +21,7 @@ public function aggregate(AggregatingFunction ...$aggregations): DataFrame
     {
         $this->groupBy->aggregate(...$aggregations);
 
-        $pipelineAdder = function (GroupBy $groupBy): void {
-            // @mago-ignore analysis:non-existent-property,method-access-on-null
-            $this->pipeline->add(new GroupByProcessor($groupBy));
-        };
-
-        // @mago-ignore analysis:invalid-method-access
-        $pipelineAdder->bindTo($this->df, $this->df)($this->groupBy);
-
-        return $this->df;
+        return $this->addProcessor(new GroupByProcessor($this->groupBy));
     }
 
     public function pivot(Reference $ref): self
@@ -38,4 +30,17 @@ public function pivot(Reference $ref): self
 
         return $this;
     }
+
+    private function addProcessor(GroupByProcessor $processor): DataFrame
+    {
+        $pipelineAdder = function (GroupByProcessor $processor): void {
+            // @mago-ignore analysis:non-existent-property,method-access-on-null
+            $this->pipeline->add($processor);
+        };
+
+        // @mago-ignore analysis:invalid-method-access
+        $pipelineAdder->bindTo($this->df, $this->df)($processor);
+
+        return $this->df;
+    }
 }
diff --git a/src/core/etl/src/Flow/ETL/GroupBy.php b/src/core/etl/src/Flow/ETL/GroupBy.php
index d606797cd4..8ae5424a18 100644
--- a/src/core/etl/src/Flow/ETL/GroupBy.php
+++ b/src/core/etl/src/Flow/ETL/GroupBy.php
@@ -4,65 +4,40 @@
 
 namespace Flow\ETL;
 
-use DateTimeImmutable;
-use DateTimeInterface;
 use Flow\ETL\Exception\InvalidArgumentException;
 use Flow\ETL\Exception\RuntimeException;
 use Flow\ETL\Function\AggregatingFunction;
-use Flow\ETL\Hash\NativePHPHash;
+use Flow\ETL\GroupBy\Aggregators;
+use Flow\ETL\GroupBy\GroupKey;
+use Flow\ETL\Row\EntryFactory;
 use Flow\ETL\Row\Reference;
 use Flow\ETL\Row\References;
-use Stringable;
+use Generator;
 
 use function array_filter;
 use function array_key_exists;
 use function array_unique;
 use function array_values;
 use function count;
-use function current;
 use function Flow\ETL\DSL\array_to_rows;
 use function Flow\Types\DSL\type_integer;
 use function Flow\Types\DSL\type_string;
 use function Flow\Types\DSL\type_union;
-use function implode;
-use function is_array;
-use function is_scalar;
-use function serialize;
 
 final class GroupBy
 {
-    /**
-     * @var array<AggregatingFunction>
-     */
-    private array $aggregations;
+    private const int RESULT_BATCH_SIZE = 1000;
 
-    /**
-     * @var array<string, array{values?: array<string, mixed>, aggregators: array<AggregatingFunction>}>
-     */
-    private array $groupedTable;
+    private Aggregators $aggregations;
 
-    private ?Reference $pivot;
-
-    /**
-     * @var array<int, null|array<array-key, mixed>|bool|float|int|object|string>
-     */
-    private array $pivotColumns;
-
-    /**
-     * @var array<string, array<string, AggregatingFunction|null|array<array-key, mixed>|bool|float|int|object|string>>
-     */
-    private array $pivotedTable;
+    private ?Reference $pivot = null;
 
     private readonly References $refs;
 
     public function __construct(string|Reference ...$entries)
     {
         $this->refs = References::init(...array_unique($entries));
-        $this->aggregations = [];
-        $this->groupedTable = [];
-        $this->pivotedTable = [];
-        $this->pivotColumns = [];
-        $this->pivot = null;
+        $this->aggregations = new Aggregators();
     }
 
     public function aggregate(AggregatingFunction ...$aggregator): void
@@ -77,41 +52,104 @@ public function aggregate(AggregatingFunction ...$aggregator): void
             );
         }
 
-        $this->aggregations = $aggregator;
+        $this->aggregations = new Aggregators(...$aggregator);
+    }
+
+    public function aggregatedRow(GroupKey $key, Aggregators $aggregators, EntryFactory $entryFactory): Row
+    {
+        $entries = [];
+
+        /** @var mixed $value */
+        foreach ($key as $name => $value) {
+            $entries[] = $entryFactory->create($name, $value);
+        }
+
+        foreach ($aggregators as $aggregator) {
+            $entries[] = $aggregator->result($entryFactory);
+        }
+
+        return Row::create(...$entries);
+    }
+
+    public function aggregations(): Aggregators
+    {
+        return $this->aggregations;
     }
 
-    public function group(Rows $rows, FlowContext $context): void
+    public function isPivot(): bool
+    {
+        return $this->pivot !== null;
+    }
+
+    public function keyValues(Row $row): GroupKey
+    {
+        $values = [];
+
+        foreach ($this->refs as $ref) {
+            try {
+                $values[$ref->name()] = $row->valueOf($ref);
+            } catch (InvalidArgumentException) {
+                $values[$ref->name()] = null;
+            }
+        }
+
+        return new GroupKey($values);
+    }
+
+    public function pivot(Reference $ref): void
+    {
+        $this->pivot = $ref;
+    }
+
+    /**
+     * @param Generator<Rows> $rows
+     *
+     * @return Generator<Rows>
+     */
+    public function pivotResult(Generator $rows, FlowContext $context): Generator
     {
         $pivot = $this->pivot;
 
-        if ($pivot !== null) {
-            foreach ($rows as $row) {
+        if ($pivot === null) {
+            throw new RuntimeException('pivotResult() called without a pivot reference');
+        }
+
+        if ($this->aggregations->count() === 0) {
+            throw new RuntimeException('Pivot requires exactly one aggregation');
+        }
+
+        $aggregation = $this->aggregations->first();
+
+        /** @var array<int, null|array<array-key, mixed>|bool|float|int|object|string> $pivotColumns */
+        $pivotColumns = [];
+        /** @var array<string, array<string, AggregatingFunction|null|array<array-key, mixed>|bool|float|int|object|string>> $pivotedTable */
+        $pivotedTable = [];
+
+        foreach ($rows as $batch) {
+            foreach ($batch as $row) {
                 try {
-                    $this->pivotColumns[] = $row->valueOf($pivot);
+                    $pivotColumns[] = $row->valueOf($pivot);
                 } catch (InvalidArgumentException) {
-                    $this->pivotColumns[] = null;
+                    $pivotColumns[] = null;
                 }
             }
 
-            $this->pivotColumns = array_values(array_filter(array_unique($this->pivotColumns)));
-
-            foreach ($rows as $row) {
+            foreach ($batch as $row) {
                 $values = [];
 
                 foreach ($this->refs as $ref) {
                     $values[$ref->name()] = $row->valueOf($ref);
                 }
 
-                $indexValue = $this->hash($values);
-
+                $indexValue = (string) new GroupKey($values);
                 $pivotValue = $row->valueOf($pivot);
 
-                if (!array_key_exists($indexValue, $this->pivotedTable)) {
-                    $this->pivotedTable[$indexValue] = [];
+                if (!array_key_exists($indexValue, $pivotedTable)) {
+                    $pivotedTable[$indexValue] = [];
                 }
 
                 foreach ($this->refs as $ref) {
-                    $this->pivotedTable[$indexValue][$ref->name()] = $row->valueOf($ref);
+                    $pivotedTable[$indexValue][$ref->name()] = $row->valueOf($ref);
                 }
 
                 if ($pivotValue === null) {
@@ -120,132 +158,49 @@ public function group(Rows $rows, FlowContext $context): void
 
                 $pivotValue = type_union(type_string(), type_integer())->assert($pivotValue);
 
-                if (!array_key_exists($pivotValue, $this->pivotedTable[$indexValue])) {
-                    // @mago-ignore analysis:invalid-property-assignment-value,possibly-invalid-clone
-                    $this->pivotedTable[$indexValue][$pivotValue] = clone current($this->aggregations);
+                if (!array_key_exists($pivotValue, $pivotedTable[$indexValue])) {
+                    $pivotedTable[$indexValue][$pivotValue] = clone $aggregation;
                 }
 
-                $aggregator = $this->pivotedTable[$indexValue][$pivotValue];
+                $aggregator = $pivotedTable[$indexValue][$pivotValue];
 
                 if ($aggregator instanceof AggregatingFunction) {
                     $aggregator->aggregate($row, $context);
                 }
             }
-        } else {
-            foreach ($rows as $row) {
-                /** @var array<string, null|mixed> $values */
-                $values = [];
-
-                foreach ($this->refs as $ref) {
-                    try {
-                        $values[$ref->name()] = $row->valueOf($ref);
-                    } catch (InvalidArgumentException) {
-                        $values[$ref->name()] = null;
-                    }
-                }
-
-                $valuesHash = $this->hash($values);
-
-                if (!array_key_exists($valuesHash, $this->groupedTable)) {
-                    $aggregators = [];
-
-                    foreach ($this->aggregations as $aggregator) {
-                        $aggregators[] = clone $aggregator;
-                    }
-
-                    $this->groupedTable[$valuesHash] = [
-                        'values' => $values,
-                        'aggregators' => $aggregators,
-                    ];
-                }
-
-                foreach ($this->groupedTable[$valuesHash]['aggregators'] as $aggregator) {
-                    $aggregator->aggregate($row, $context);
-                }
-            }
         }
-    }
-
-    public function pivot(Reference $ref): void
-    {
-        $this->pivot = $ref;
-    }
-
-    public function result(FlowContext $context): Rows
-    {
-        $rows = [];
 
-        if ($this->pivot) {
-            foreach ($this->pivotedTable as $index => $columns) {
-                $row = [$this->refs->first()->name() => $index];
+        $pivotColumns = array_values(array_filter(array_unique($pivotColumns)));
 
-                foreach ($columns as $rowIndex => $values) {
-                    $row[$rowIndex] = $values instanceof AggregatingFunction
-                        ? $values->result($context->entryFactory())->value()
-                        : $values;
-                }
+        $buffer = [];
 
-                foreach ($this->pivotColumns as $column) {
-                    $column = type_union(type_string(), type_integer())->assert($column);
+        foreach ($pivotedTable as $index => $columns) {
+            $row = [$this->refs->first()->name() => $index];
 
-                    if (!array_key_exists($column, $row)) {
-                        $row[$column] = null;
-                    }
-                }
-
-                $rows[] = $row;
+            foreach ($columns as $rowIndex => $value) {
+                $row[$rowIndex] = $value instanceof AggregatingFunction
+                    ? $value->result($context->entryFactory())->value()
+                    : $value;
             }
 
-            return array_to_rows($rows, $context->entryFactory());
-        }
-
-        foreach ($this->groupedTable as $group) {
-            $entries = [];
+            foreach ($pivotColumns as $column) {
+                $column = type_union(type_string(), type_integer())->assert($column);
 
-            /** @var mixed $value */
-            foreach ($group['values'] ?? [] as $entry => $value) {
-                $entries[] = $context->entryFactory()->create($entry, $value);
+                if (!array_key_exists($column, $row)) {
+                    $row[$column] = null;
+                }
             }
 
-            foreach ($group['aggregators'] as $aggregator) {
-                $entries[] = $aggregator->result($context->entryFactory());
-            }
+            $buffer[] = $row;
 
-            if (count($entries)) {
-                $rows[] = Row::create(...$entries);
+            if (count($buffer) >= self::RESULT_BATCH_SIZE) {
+                yield array_to_rows($buffer, $context->entryFactory());
+                $buffer = [];
             }
         }
 
-        return new Rows(...$rows);
-    }
-
-    /**
-     * @param array<array-key, mixed> $values
-     */
-    private function hash(array $values): string
-    {
-        /** @var array<string> $stringValues */
-        $stringValues = [];
-
-        /** @var mixed $value */
-        foreach ($values as $value) {
-            if ($value === null) {
-                $stringValues[] = 'null';
-            } elseif (is_scalar($value)) {
-                $stringValues[] = (string) $value;
-            } else {
-                if ($value instanceof Stringable) {
-                    $stringValues[] = $value->__toString();
-                } elseif ($value instanceof DateTimeInterface) {
-                    $stringValues[] = $value->format(DateTimeImmutable::ATOM);
-                } elseif (is_array($value)) {
-                    $stringValues[] = $this->hash($value);
-                } else {
-                    $stringValues[] = serialize($value);
-                }
-            }
+        if ($buffer !== []) {
+            yield array_to_rows($buffer, $context->entryFactory());
         }
-
-        return NativePHPHash::xxh128(implode('', $stringValues));
     }
 }
diff --git a/src/core/etl/src/Flow/ETL/GroupBy/Aggregators.php b/src/core/etl/src/Flow/ETL/GroupBy/Aggregators.php
new file mode 100644
index 0000000000..5a07f38ab7
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/GroupBy/Aggregators.php
@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\GroupBy;
+
+use ArrayIterator;
+use Countable;
+use Flow\ETL\Exception\InvalidArgumentException;
+use Flow\ETL\FlowContext;
+use Flow\ETL\Function\AggregatingFunction;
+use Flow\ETL\Row;
+use IteratorAggregate;
+use Traversable;
+
+use function array_map;
+use function count;
+
+/**
+ * @implements IteratorAggregate<array-key, AggregatingFunction>
+ */
+final readonly class Aggregators implements Countable, IteratorAggregate
+{
+    /**
+     * @var array<array-key, AggregatingFunction>
+     */
+    private array $aggregators;
+
+    public function __construct(AggregatingFunction ...$aggregators)
+    {
+        $this->aggregators = $aggregators;
+    }
+
+    public function aggregate(Row $row, FlowContext $context): void
+    {
+        foreach ($this->aggregators as $aggregator) {
+            $aggregator->aggregate($row, $context);
+        }
+    }
+
+    public function cloned(): self
+    {
+        return new self(...array_map(
+            static fn(AggregatingFunction $aggregator): AggregatingFunction => clone $aggregator,
+            $this->aggregators,
+        ));
+    }
+
+    public function count(): int
+    {
+        return count($this->aggregators);
+    }
+
+    public function first(): AggregatingFunction
+    {
+        if ($this->aggregators === []) {
+            throw new InvalidArgumentException('Aggregators are empty.');
+        }
+
+        return $this->aggregators[0];
+    }
+
+    public function getIterator(): Traversable
+    {
+        return new ArrayIterator($this->aggregators);
+    }
+}
diff --git a/src/core/etl/src/Flow/ETL/GroupBy/Bucket.php b/src/core/etl/src/Flow/ETL/GroupBy/Bucket.php
new file mode 100644
index 0000000000..9cfbc5a8de
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/GroupBy/Bucket.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\GroupBy;
+
+final readonly class Bucket
+{
+    public function __construct(
+        public GroupKey $key,
+        public Aggregators $aggregators,
+    ) {}
+}
diff --git a/src/core/etl/src/Flow/ETL/GroupBy/BucketAggregation.php b/src/core/etl/src/Flow/ETL/GroupBy/BucketAggregation.php
new file mode 100644
index 0000000000..c7b3dbdcc8
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/GroupBy/BucketAggregation.php
@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\GroupBy;
+
+use Flow\ETL\FlowContext;
+use Flow\ETL\GroupBy;
+use Flow\ETL\Rows;
+use Generator;
+
+use function count;
+
+final readonly class BucketAggregation
+{
+    private const int RESULT_BATCH_SIZE = 1000;
+
+    /**
+     * @param Generator<Rows> $rows
+     *
+     * @return Generator<Rows>
+     */
+    public function aggregate(Generator $rows, FlowContext $context, GroupBy $groupBy): Generator
+    {
+        /** @var array<string, Bucket> $buckets */
+        $buckets = [];
+        $aggregations = $groupBy->aggregations();
+
+        foreach ($rows as $batch) {
+            foreach ($batch as $row) {
+                $key = $groupBy->keyValues($row);
+                $bucket = $buckets[(string) $key] ??= new Bucket($key, $aggregations->cloned());
+                $bucket->aggregators->aggregate($row, $context);
+            }
+        }
+
+        $buffer = [];
+        $entryFactory = $context->entryFactory();
+
+        foreach ($buckets as $bucket) {
+            $buffer[] = $groupBy->aggregatedRow($bucket->key, $bucket->aggregators, $entryFactory);
+
+            if (count($buffer) >= self::RESULT_BATCH_SIZE) {
+                yield new Rows(...$buffer);
+                $buffer = [];
+            }
+        }
+
+        if ($buffer !== []) {
+            yield new Rows(...$buffer);
+        }
+    }
+}
diff --git a/src/core/etl/src/Flow/ETL/GroupBy/ExternalAggregation.php b/src/core/etl/src/Flow/ETL/GroupBy/ExternalAggregation.php
new file mode 100644
index 0000000000..e9f31c263d
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/GroupBy/ExternalAggregation.php
@@ -0,0 +1,116 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\GroupBy;
+
+use Flow\ETL\Exception\InvalidArgumentException;
+use Flow\ETL\FlowContext;
+use Flow\ETL\GroupBy;
+use Flow\ETL\Hash\NativePHPHash;
+use Flow\ETL\Row;
+use Flow\ETL\Rows;
+use Flow\ETL\Sort\ExternalSort\BucketsCache;
+use Generator;
+use Throwable;
+
+use function bin2hex;
+use function count;
+use function hexdec;
+use function random_bytes;
+use function substr;
+
+final readonly class ExternalAggregation
+{
+    /**
+     * @param int<1, max> $bucketsCount
+     * @param int<1, max> $batchSize
+     */
+    public function __construct(
+        private BucketsCache $cache,
+        private int $bucketsCount,
+        private int $batchSize,
+    ) {
+        // @mago-ignore analysis:invalid-operand
+        // @mago-ignore analysis:impossible-condition,redundant-comparison
+        if ($this->bucketsCount < 1) {
+            throw new InvalidArgumentException('Buckets count must be greater than 0, given: ' . $this->bucketsCount);
+        }
+
+        // @mago-ignore analysis:invalid-operand
+        // @mago-ignore analysis:impossible-condition,redundant-comparison
+        if ($this->batchSize < 1) {
+            throw new InvalidArgumentException('Batch size must be greater than 0, given: ' . $this->batchSize);
+        }
+    }
+
+    /**
+     * @param Generator<Rows> $rows
+     *
+     * @return Generator<Rows>
+     */
+    public function aggregate(Generator $rows, FlowContext $context, GroupBy $groupBy): Generator
+    {
+        $runId = bin2hex(random_bytes(8));
+
+        /** @var array<int, string> $buckets */
+        $buckets = [];
+
+        try {
+            foreach ($rows as $batch) {
+                /** @var array<int, list<Row>> $bucketed */
+                $bucketed = [];
+
+                foreach ($batch as $row) {
+                    $bucketed[$this->bucket((string) $groupBy->keyValues($row))][] = $row;
+                }
+
+                foreach ($bucketed as $bucket => $bucketRows) {
+                    $buckets[$bucket] ??= 'group-by-' . $runId . '-bucket-' . $bucket;
+                    $this->cache->append($buckets[$bucket], new Rows(...$bucketRows));
+                }
+            }
+
+            $aggregation = new BucketAggregation();
+
+            foreach ($buckets as $bucketId) {
+                foreach ($aggregation->aggregate($this->bucketRows($bucketId), $context, $groupBy) as $resultBatch) {
+                    yield $resultBatch;
+                }
+            }
+        } finally {
+            foreach ($buckets as $bucketId) {
+                try {
+                    $this->cache->remove($bucketId);
+                } catch (Throwable) {
+                }
+            }
+        }
+    }
+
+    private function bucket(string $key): int
+    {
+        return (int) hexdec(substr(NativePHPHash::xxh128($key), 0, 8)) % $this->bucketsCount;
+    }
+
+    /**
+     * @return Generator<int, Rows>
+     */
+    private function bucketRows(string $bucketId): Generator
+    {
+        $buffer = [];
+
+        foreach ($this->cache->get($bucketId) as $row) {
+            $buffer[] = $row;
+
+            if (count($buffer) >= $this->batchSize) {
+                yield new Rows(...$buffer);
+                $buffer = [];
+            }
+        }
+
+        if ($buffer !== []) {
+            yield new Rows(...$buffer);
+        }
+    }
+}
diff --git a/src/core/etl/src/Flow/ETL/GroupBy/GroupKey.php b/src/core/etl/src/Flow/ETL/GroupBy/GroupKey.php
new file mode 100644
index 0000000000..f313fd1362
--- /dev/null
+++ b/src/core/etl/src/Flow/ETL/GroupBy/GroupKey.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\GroupBy;
+
+use ArrayIterator;
+use IteratorAggregate;
+use Stringable;
+use Traversable;
+
+use function serialize;
+
+/**
+ * @implements IteratorAggregate<string, mixed>
+ */
+final readonly class GroupKey implements IteratorAggregate, Stringable
+{
+    /**
+     * @param array<string, mixed> $values ref name => key value
+     */
+    public function __construct(
+        private array $values,
+    ) {}
+
+    public function __toString(): string
+    {
+        return serialize($this->values);
+    }
+
+    public function getIterator(): Traversable
+    {
+        return new ArrayIterator($this->values);
+    }
+}
diff --git a/src/core/etl/src/Flow/ETL/Processor/GroupByProcessor.php b/src/core/etl/src/Flow/ETL/Processor/GroupByProcessor.php
index 46f0050ad6..844dfdadb2 100644
--- a/src/core/etl/src/Flow/ETL/Processor/GroupByProcessor.php
+++ b/src/core/etl/src/Flow/ETL/Processor/GroupByProcessor.php
@@ -6,6 +6,7 @@
 
 use Flow\ETL\FlowContext;
 use Flow\ETL\GroupBy;
+use Flow\ETL\GroupBy\ExternalAggregation;
 use Flow\ETL\Processor;
 use Generator;
 
@@ -22,10 +23,18 @@ public function __construct(
 
     public function process(Generator $rows, FlowContext $context): Generator
     {
-        foreach ($rows as $batch) {
-            $this->groupBy->group($batch, $context);
+        if ($this->groupBy->isPivot()) {
+            yield from $this->groupBy->pivotResult($rows, $context);
+
+            return;
         }
 
-        yield $this->groupBy->result($context);
+        $config = $context->config->grouping;
+
+        yield from (new ExternalAggregation($config->cache, $config->bucketsCount, $config->batchSize))->aggregate(
+            $rows,
+            $context,
+            $this->groupBy,
+        );
     }
 }
diff --git a/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache.php b/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache.php
index ec9895c3c5..b77d5fe0a8 100644
--- a/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache.php
+++ b/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache.php
@@ -10,6 +10,11 @@
 
 interface BucketsCache
 {
+    /**
+     * @param iterable<Row>|Rows $rows
+     */
+    public function append(string $bucketId, iterable|Rows $rows): void;
+
     /**
      * @return \Generator<Row>
      */
diff --git a/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache/FilesystemBucketsCache.php b/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache/FilesystemBucketsCache.php
index 87db1fe72e..f9960ecdfe 100644
--- a/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache/FilesystemBucketsCache.php
+++ b/src/core/etl/src/Flow/ETL/Sort/ExternalSort/BucketsCache/FilesystemBucketsCache.php
@@ -17,19 +17,24 @@
 
 use function count;
 
-final readonly class FilesystemBucketsCache implements BucketsCache
+final class FilesystemBucketsCache implements BucketsCache
 {
-    private Path $cacheDir;
+    private readonly Path $cacheDir;
 
-    private FloeReader $reader;
+    private readonly FloeReader $reader;
+
+    /**
+     * @var array<string, FloeWriter>
+     */
+    private array $writers = [];
 
     /**
      * @param int<1, max> $batchSize
      */
     public function __construct(
-        private Filesystem $filesystem,
+        private readonly Filesystem $filesystem,
         ?Path $cacheDir = null,
-        private int $batchSize = 1000,
+        private readonly int $batchSize = 1000,
     ) {
         // @mago-ignore analysis:impossible-condition,redundant-comparison
         if ($this->batchSize < 1) {
@@ -40,11 +45,27 @@ public function __construct(
         $this->reader = new FloeReader($this->filesystem);
     }
 
+    /**
+     * @param iterable<Row>|Rows $rows
+     */
+    public function append(string $bucketId, iterable $rows): void
+    {
+        if (!isset($this->writers[$bucketId])) {
+            $writer = new FloeWriter($this->filesystem);
+            $writer->append($this->keyPath($bucketId));
+            $this->writers[$bucketId] = $writer;
+        }
+
+        $this->write($this->writers[$bucketId], $rows);
+    }
+
     /**
      * @return \Generator<Row>
      */
     public function get(string $bucketId): Generator
     {
+        $this->closeWriter($bucketId);
+
         $path = $this->keyPath($bucketId);
 
         if (!$this->filesystem->status($path)) {
@@ -58,6 +79,8 @@ public function get(string $bucketId): Generator
 
     public function remove(string $bucketId): void
     {
+        $this->closeWriter($bucketId);
+
         // we want to remove not only cache file but entire directory
         $this->filesystem->rm($this->keyPath($bucketId)->parentDirectory());
     }
@@ -68,9 +91,38 @@ public function remove(string $bucketId): void
      */
     public function set(string $bucketId, iterable $rows): void
     {
+        $this->closeWriter($bucketId);
+
         $writer = new FloeWriter($this->filesystem);
         $writer->create($this->keyPath($bucketId));
 
+        $this->write($writer, $rows);
+
+        $writer->close();
+    }
+
+    private function closeWriter(string $bucketId): void
+    {
+        if (!isset($this->writers[$bucketId])) {
+            return;
+        }
+
+        $writer = $this->writers[$bucketId];
+        unset($this->writers[$bucketId]);
+
+        $writer->close();
+    }
+
+    private function keyPath(string $key): Path
+    {
+        return $this->cacheDir->suffix(NativePHPHash::xxh128($key) . '/' . $key . '.floe');
+    }
+
+    /**
+     * @param iterable<Row>|Rows $rows
+     */
+    private function write(FloeWriter $writer, iterable $rows): void
+    {
         $batch = [];
 
         foreach ($rows as $row) {
@@ -85,12 +137,5 @@ public function set(string $bucketId, iterable $rows): void
         if ($batch !== []) {
             $writer->write(new Rows(...$batch));
         }
-
-        $writer->close();
-    }
-
-    private function keyPath(string $key): Path
-    {
-        return $this->cacheDir->suffix(NativePHPHash::xxh128($key) . '/' . $key . '.floe');
     }
 }
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Integration/DataFrame/GroupByAggregationTest.php b/src/core/etl/tests/Flow/ETL/Tests/Integration/DataFrame/GroupByAggregationTest.php
new file mode 100644
index 0000000000..64abf624d6
--- /dev/null
+++ b/src/core/etl/tests/Flow/ETL/Tests/Integration/DataFrame/GroupByAggregationTest.php
@@ -0,0 +1,248 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Tests\Integration\DataFrame;
+
+use Flow\ETL\Config\ConfigBuilder;
+use Flow\ETL\Tests\Double\FakeRandomOrdersExtractor;
+use Flow\ETL\Tests\FlowIntegrationTestCase;
+
+use function array_map;
+use function Flow\ETL\DSL\average;
+use function Flow\ETL\DSL\collect;
+use function Flow\ETL\DSL\collect_unique;
+use function Flow\ETL\DSL\config_builder;
+use function Flow\ETL\DSL\count;
+use function Flow\ETL\DSL\data_frame;
+use function Flow\ETL\DSL\first;
+use function Flow\ETL\DSL\from_array;
+use function Flow\ETL\DSL\last;
+use function Flow\ETL\DSL\ref;
+use function Flow\ETL\DSL\sum;
+use function iterator_to_array;
+
+final class GroupByAggregationTest extends FlowIntegrationTestCase
+{
+    public function test_partition_count_does_not_affect_the_result(): void
+    {
+        $input = [
+            ['seller' => 'a', 'amount' => 10],
+            ['seller' => 'b', 'amount' => 5],
+            ['seller' => 'a', 'amount' => 20],
+            ['seller' => 'c', 'amount' => 1],
+            ['seller' => 'b', 'amount' => 7],
+            ['seller' => 'a', 'amount' => 3],
+        ];
+
+        $pipeline = static fn(ConfigBuilder $config): array => iterator_to_array(
+            data_frame($config)
+                ->read(from_array($input))
+                ->groupBy(ref('seller'))
+                ->aggregate(count(ref('seller')), sum(ref('amount')))
+                ->sortBy(ref('seller')->asc())
+                ->getEachAsArray(),
+        );
+
+        $default = $pipeline(config_builder());
+        $fewPartitions = $pipeline(config_builder()->groupingBucketsCount(3)->groupingBatchSize(2));
+
+        static::assertSame($default, $fewPartitions);
+        static::assertCount(3, $default);
+
+        $bySeller = [];
+
+        foreach ($default as $row) {
+            $bySeller[$row['seller']] = ['count' => $row['seller_count'], 'sum' => $row['amount_sum']];
+        }
+
+        static::assertSame(
+            [
+                'a' => ['count' => 3, 'sum' => 33],
+                'b' => ['count' => 2, 'sum' => 12],
+                'c' => ['count' => 1, 'sum' => 1],
+            ],
+            $bySeller,
+        );
+    }
+
+    public function test_multi_column_key_does_not_collide(): void
+    {
+        $input = [
+            ['a' => 'x', 'b' => 'yz', 'v' => 1],
+            ['a' => 'xy', 'b' => 'z', 'v' => 1],
+            ['a' => 'x', 'b' => 'yz', 'v' => 1],
+        ];
+
+        $result = iterator_to_array(
+            data_frame(config_builder()->groupingBucketsCount(3))
+                ->read(from_array($input))
+                ->groupBy(ref('a'), ref('b'))
+                ->aggregate(sum(ref('v')))
+                ->sortBy(ref('a')->asc())
+                ->getEachAsArray(),
+        );
+
+        static::assertCount(2, $result);
+
+        $byGroup = [];
+
+        foreach ($result as $row) {
+            $byGroup[(string) $row['a'] . '|' . (string) $row['b']] = $row['v_sum'];
+        }
+
+        static::assertSame(2, $byGroup['x|yz']);
+        static::assertSame(1, $byGroup['xy|z']);
+    }
+
+    public function test_chained_filesystem_group_by_stages_do_not_corrupt_each_other(): void
+    {
+        $input = [
+            ['seller' => 'a', 'region' => 'south'],
+            ['seller' => 'b', 'region' => 'north'],
+            ['seller' => 'c', 'region' => 'south'],
+            ['seller' => 'd', 'region' => 'north'],
+            ['seller' => 'e', 'region' => 'south'],
+            ['seller' => 'f', 'region' => 'north'],
+        ];
+
+        $result = iterator_to_array(
+            data_frame(config_builder()->groupingBucketsCount(3))
+                ->read(from_array($input))
+                ->groupBy(ref('seller'), ref('region'))
+                ->aggregate(count(ref('seller')))
+                ->groupBy(ref('region'))
+                ->aggregate(count(ref('region')))
+                ->sortBy(ref('region')->asc())
+                ->getEachAsArray(),
+        );
+
+        $byRegion = [];
+
+        foreach ($result as $row) {
+            $byRegion[$row['region']] = $row['region_count'];
+        }
+
+        static::assertSame(['north' => 3, 'south' => 3], $byRegion);
+    }
+
+    public function test_first_and_last_survive_the_filesystem_round_trip(): void
+    {
+        $input = [
+            ['k' => 'a', 'v' => 1],
+            ['k' => 'a', 'v' => 2],
+            ['k' => 'a', 'v' => 3],
+        ];
+
+        $result = iterator_to_array(
+            data_frame(config_builder()->groupingBucketsCount(3))
+                ->read(from_array($input))
+                ->groupBy(ref('k'))
+                ->aggregate(first(ref('v')), last(ref('v')))
+                ->sortBy(ref('k')->asc())
+                ->getEachAsArray(),
+        );
+
+        static::assertSame(1, $result[0]['v_first']);
+        static::assertSame(3, $result[0]['v_last']);
+    }
+
+    public function test_collect_matches_across_partition_counts(): void
+    {
+        $input = [
+            ['k' => 'a', 'v' => 1],
+            ['k' => 'b', 'v' => 4],
+            ['k' => 'a', 'v' => 2],
+            ['k' => 'c', 'v' => 6],
+            ['k' => 'b', 'v' => 5],
+            ['k' => 'a', 'v' => 3],
+        ];
+
+        $pipeline = static fn(ConfigBuilder $config): array => iterator_to_array(
+            data_frame($config)
+                ->read(from_array($input))
+                ->groupBy(ref('k'))
+                ->aggregate(collect(ref('v')), collect_unique(ref('v')))
+                ->sortBy(ref('k')->asc())
+                ->getEachAsArray(),
+        );
+
+        $default = $pipeline(config_builder());
+        $fewPartitions = $pipeline(config_builder()->groupingBucketsCount(3));
+
+        static::assertSame($default, $fewPartitions);
+
+        $byKey = [];
+
+        foreach ($default as $row) {
+            $byKey[$row['k']] = [
+                'collection' => $row['v_collection'],
+                'collection_unique' => $row['v_collection_unique'],
+            ];
+        }
+
+        static::assertSame(
+            [
+                'a' => ['collection' => [1, 2, 3], 'collection_unique' => [1, 2, 3]],
+                'b' => ['collection' => [4, 5], 'collection_unique' => [4, 5]],
+                'c' => ['collection' => [6], 'collection_unique' => [6]],
+            ],
+            $byKey,
+        );
+    }
+
+    public function test_average_matches_across_partition_counts(): void
+    {
+        $input = [
+            ['k' => 'a', 'v' => 2],
+            ['k' => 'b', 'v' => 10],
+            ['k' => 'c', 'v' => 7],
+            ['k' => 'a', 'v' => 4],
+            ['k' => 'b', 'v' => 20],
+            ['k' => 'b', 'v' => 30],
+        ];
+
+        $pipeline = static fn(ConfigBuilder $config): array => iterator_to_array(
+            data_frame($config)
+                ->read(from_array($input))
+                ->groupBy(ref('k'))
+                ->aggregate(average(ref('v')))
+                ->sortBy(ref('k')->asc())
+                ->getEachAsArray(),
+        );
+
+        $default = $pipeline(config_builder());
+        $fewPartitions = $pipeline(config_builder()->groupingBucketsCount(3));
+
+        static::assertSame($default, $fewPartitions);
+
+        $byKey = [];
+
+        foreach ($default as $row) {
+            $byKey[$row['k']] = $row['v_avg'];
+        }
+
+        static::assertSame(['a' => 3, 'b' => 20, 'c' => 7], $byKey);
+    }
+
+    public function test_partition_count_does_not_affect_a_realistic_dataset(): void
+    {
+        $raw = iterator_to_array((new FakeRandomOrdersExtractor(1000))->rawData(), false);
+        $data = array_map(static fn(array $order): array => [
+            'seller_id' => $order['seller_id'],
+            'email' => $order['email'],
+            'discount' => $order['discount'],
+        ], $raw);
+
+        $pipeline = static fn(ConfigBuilder $config): array => iterator_to_array(
+            data_frame($config)
+                ->read(from_array($data))
+                ->groupBy(ref('email'))
+                ->aggregate(count(ref('email')), sum(ref('discount')))
+                ->sortBy(ref('email')->asc())
+                ->getEachAsArray(),
+        );
+
+        static::assertSame($pipeline(config_builder()), $pipeline(config_builder()->groupingBucketsCount(3)));
+    }
+}
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Integration/DataFrame/GroupByScaleTest.php b/src/core/etl/tests/Flow/ETL/Tests/Integration/DataFrame/GroupByScaleTest.php
new file mode 100644
index 0000000000..47dc9f8d46
--- /dev/null
+++ b/src/core/etl/tests/Flow/ETL/Tests/Integration/DataFrame/GroupByScaleTest.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Tests\Integration\DataFrame;
+
+use Flow\ETL\Tests\Double\FakeRandomOrdersExtractor;
+use Flow\ETL\Tests\FlowIntegrationTestCase;
+
+use function Flow\ETL\DSL\config_builder;
+use function Flow\ETL\DSL\count;
+use function Flow\ETL\DSL\data_frame;
+use function Flow\ETL\DSL\from_array;
+use function Flow\ETL\DSL\ref;
+use function Flow\ETL\DSL\sum;
+use function iterator_to_array;
+use function microtime;
+
+final class GroupByScaleTest extends FlowIntegrationTestCase
+{
+    public function test_aggregation_stays_fast_at_100k(): void
+    {
+        $data = [];
+
+        foreach ((new FakeRandomOrdersExtractor(100_000))->rawData() as $order) {
+            $data[] = [
+                'seller_id' => $order['seller_id'],
+                'email' => $order['email'],
+                'discount' => $order['discount'],
+            ];
+        }
+
+        $start = microtime(true);
+
+        $result = iterator_to_array(
+            data_frame(config_builder())
+                ->read(from_array($data))
+                ->groupBy(ref('email'))
+                ->aggregate(count(ref('email')), sum(ref('discount')))
+                ->sortBy(ref('email')->asc())
+                ->getEachAsArray(),
+        );
+
+        $elapsed = microtime(true) - $start;
+
+        static::assertNotEmpty($result);
+
+        static::assertLessThan(
+            30.0,
+            $elapsed,
+            'filesystem aggregation at 100k regressed toward the old super-linear cliff',
+        );
+    }
+}
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Integration/Sort/ExternalSort/FilesystemBucketsCacheTest.php b/src/core/etl/tests/Flow/ETL/Tests/Integration/Sort/ExternalSort/FilesystemBucketsCacheTest.php
index ce1abb1e24..9da14e55d5 100644
--- a/src/core/etl/tests/Flow/ETL/Tests/Integration/Sort/ExternalSort/FilesystemBucketsCacheTest.php
+++ b/src/core/etl/tests/Flow/ETL/Tests/Integration/Sort/ExternalSort/FilesystemBucketsCacheTest.php
@@ -15,6 +15,78 @@
 
 final class FilesystemBucketsCacheTest extends FlowIntegrationTestCase
 {
+    public function test_appends_accumulate_into_one_bucket_in_order(): void
+    {
+        $cacheDir = path(__DIR__ . '/var/buckets_append');
+        $this->fs()->rm($cacheDir);
+
+        $cache = new FilesystemBucketsCache($this->fs(), cacheDir: $cacheDir, batchSize: 2);
+        $cache->append('bucket', [row(int_entry('id', 1)), row(int_entry('id', 2))]);
+        $cache->append('bucket', [row(int_entry('id', 3))]);
+        $cache->append('bucket', [row(int_entry('id', 4)), row(int_entry('id', 5))]);
+
+        $ids = [];
+
+        foreach ($cache->get('bucket') as $row) {
+            $ids[] = $row->valueOf('id');
+        }
+
+        static::assertSame([1, 2, 3, 4, 5], $ids);
+
+        $this->fs()->rm($cacheDir);
+    }
+
+    public function test_append_after_get_does_not_truncate_the_bucket(): void
+    {
+        $cacheDir = path(__DIR__ . '/var/buckets_append_reopen');
+        $this->fs()->rm($cacheDir);
+
+        $cache = new FilesystemBucketsCache($this->fs(), cacheDir: $cacheDir);
+        $cache->append('bucket', [row(int_entry('id', 1))]);
+
+        static::assertCount(1, iterator_to_array($cache->get('bucket'), false));
+
+        $cache->append('bucket', [row(int_entry('id', 2))]);
+
+        static::assertCount(2, iterator_to_array($cache->get('bucket'), false));
+
+        $this->fs()->rm($cacheDir);
+    }
+
+    public function test_remove_closes_an_open_append_session(): void
+    {
+        $cacheDir = path(__DIR__ . '/var/buckets_append_remove');
+        $this->fs()->rm($cacheDir);
+
+        $cache = new FilesystemBucketsCache($this->fs(), cacheDir: $cacheDir);
+        $cache->append('bucket', [row(int_entry('id', 1))]);
+        $cache->remove('bucket');
+
+        static::assertSame([], iterator_to_array($cache->get('bucket')));
+
+        $this->fs()->rm($cacheDir);
+    }
+
+    public function test_set_replaces_a_bucket_written_with_append(): void
+    {
+        $cacheDir = path(__DIR__ . '/var/buckets_append_set');
+        $this->fs()->rm($cacheDir);
+
+        $cache = new FilesystemBucketsCache($this->fs(), cacheDir: $cacheDir);
+        $cache->append('bucket', [row(int_entry('id', 1)), row(int_entry('id', 2))]);
+        $cache->set('bucket', [row(int_entry('id', 3))]);
+
+        $ids = [];
+
+        foreach ($cache->get('bucket') as $row) {
+            $ids[] = $row->valueOf('id');
+        }
+
+        static::assertSame([3], $ids);
+
+        $this->fs()->rm($cacheDir);
+    }
+
     public function test_custom_batch_size_round_trips_all_rows(): void
     {
         $cacheDir = path(__DIR__ . '/var/buckets_batch_size');
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/Cache/Implementation/ApcuCacheTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/Cache/Implementation/ApcuCacheTest.php
new file mode 100644
index 0000000000..743471524b
--- /dev/null
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/Cache/Implementation/ApcuCacheTest.php
@@ -0,0 +1,124 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Tests\Unit\Cache\Implementation;
+
+use Flow\ETL\Cache\Implementation\ApcuCache;
+use Flow\ETL\Exception\KeyNotInCacheException;
+use Flow\ETL\Tests\FlowTestCase;
+use Override;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\RequiresPhpExtension;
+
+use function apcu_enabled;
+use function Flow\ETL\DSL\int_entry;
+use function Flow\ETL\DSL\row;
+use function Flow\ETL\DSL\rows;
+use function Flow\ETL\DSL\str_entry;
+use function iterator_to_array;
+
+#[CoversClass(ApcuCache::class)]
+#[RequiresPhpExtension('apcu')]
+final class ApcuCacheTest extends FlowTestCase
+{
+    private ApcuCache $cache;
+
+    private ApcuCache $otherCache;
+
+    #[Override]
+    protected function setUp(): void
+    {
+        if (!apcu_enabled()) {
+            static::markTestSkipped('APCu is not enabled for CLI (apc.enable_cli=0).');
+        }
+
+        $this->cache = new ApcuCache('flow_php_cache_test');
+        $this->otherCache = new ApcuCache('flow_php_cache_test_other');
+
+        $this->cache->clear();
+        $this->otherCache->clear();
+    }
+
+    #[Override]
+    protected function tearDown(): void
+    {
+        if (!isset($this->cache)) {
+            return;
+        }
+
+        $this->cache->clear();
+        $this->otherCache->clear();
+    }
+
+    public function test_caching_rows(): void
+    {
+        static::assertFalse($this->cache->has('rows'));
+
+        $this->cache->set(
+            'rows',
+            $rows = rows(
+                row(int_entry('id', 1), str_entry('name', 'John')),
+                row(int_entry('id', 2), str_entry('name', 'Jane')),
+            ),
+        );
+
+        static::assertTrue($this->cache->has('rows'));
+        static::assertEquals($rows, $this->cache->get('rows'));
+    }
+
+    public function test_checking_on_non_existing_cache_key(): void
+    {
+        static::assertFalse($this->cache->has('non-existing'));
+    }
+
+    public function test_clearing_cache_removes_only_its_own_namespace(): void
+    {
+        $this->cache->set('rows', rows(row(int_entry('id', 1))));
+        $this->otherCache->set('rows', rows(row(int_entry('id', 2))));
+
+        $this->cache->clear();
+
+        static::assertFalse($this->cache->has('rows'));
+        static::assertTrue($this->otherCache->has('rows'));
+    }
+
+    public function test_getting_non_existing_cache_key(): void
+    {
+        $this->expectException(KeyNotInCacheException::class);
+
+        $this->cache->get('non-existing');
+    }
+
+    public function test_reading_rows(): void
+    {
+        $this->cache->set('rows', $rows = rows(row(int_entry('id', 1)), row(int_entry('id', 2))));
+
+        static::assertEquals([$rows], iterator_to_array($this->cache->read('rows'), false));
+    }
+
+    public function test_reading_non_existing_cache_key(): void
+    {
+        $this->expectException(KeyNotInCacheException::class);
+
+        iterator_to_array($this->cache->read('non-existing'), false);
+    }
+
+    public function test_removing_from_cache(): void
+    {
+        $this->cache->set('first', rows(row(int_entry('id', 1))));
+        $this->cache->set('second', rows(row(int_entry('id', 2))));
+
+        $this->cache->delete('second');
+
+        static::assertTrue($this->cache->has('first'));
+        static::assertFalse($this->cache->has('second'));
+    }
+
+    public function test_removing_non_existing_cache_key(): void
+    {
+        $this->cache->delete('non-existing');
+
+        static::assertFalse($this->cache->has('non-existing'));
+    }
+}
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/Config/Grouping/GroupingConfigBuilderTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/Config/Grouping/GroupingConfigBuilderTest.php
new file mode 100644
index 0000000000..f2c9aec8d4
--- /dev/null
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/Config/Grouping/GroupingConfigBuilderTest.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Tests\Unit\Config\Grouping;
+
+use Flow\ETL\Config\Grouping\GroupingConfigBuilder;
+use Flow\ETL\Sort\ExternalSort\BucketsCache\FilesystemBucketsCache;
+use Flow\ETL\Tests\FlowTestCase;
+use Flow\Filesystem\Local\NativeLocalFilesystem;
+use Flow\Filesystem\Path;
+
+use function Flow\Filesystem\DSL\fstab;
+
+final class GroupingConfigBuilderTest extends FlowTestCase
+{
+    public function test_default_builds_a_filesystem_buckets_cache(): void
+    {
+        $config = (new GroupingConfigBuilder())->build(fstab(), Path::realpath(__DIR__));
+
+        static::assertInstanceOf(FilesystemBucketsCache::class, $config->cache);
+        static::assertSame(64, $config->bucketsCount);
+        static::assertSame(1000, $config->batchSize);
+    }
+
+    public function test_injected_cache_wins_over_the_default(): void
+    {
+        $cache = new FilesystemBucketsCache(new NativeLocalFilesystem(), Path::realpath(__DIR__));
+
+        $config = (new GroupingConfigBuilder())
+            ->cache($cache)
+            ->build(fstab(), Path::realpath(__DIR__));
+
+        static::assertSame($cache, $config->cache);
+    }
+
+    public function test_buckets_count_and_batch_size_are_set(): void
+    {
+        $config = (new GroupingConfigBuilder())
+            ->bucketsCount(4)
+            ->batchSize(250)
+            ->build(fstab(), Path::realpath(__DIR__));
+
+        static::assertSame(4, $config->bucketsCount);
+        static::assertSame(250, $config->batchSize);
+    }
+}
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/GroupBy/BucketAggregationTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/GroupBy/BucketAggregationTest.php
new file mode 100644
index 0000000000..491e66d168
--- /dev/null
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/GroupBy/BucketAggregationTest.php
@@ -0,0 +1,100 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\ETL\Tests\Unit\GroupBy;
+
+use Flow\ETL\GroupBy;
+use Flow\ETL\GroupBy\BucketAggregation;
+use Flow\ETL\Tests\FlowTestCase;
+
+use function Flow\ETL\DSL\first;
+use function Flow\ETL\DSL\flow_context;
+use function Flow\ETL\DSL\int_entry;
+use function Flow\ETL\DSL\last;
+use function Flow\ETL\DSL\ref;
+use function Flow\ETL\DSL\row;
+use function Flow\ETL\DSL\rows;
+use function Flow\ETL\DSL\str_entry;
+use function Flow\ETL\DSL\sum;
+
+final class BucketAggregationTest extends FlowTestCase
+{
+    public function test_folds_groups_across_multiple_batches(): void
+    {
+        $context = flow_context();
+
+        $groupBy = new GroupBy(ref('k'));
+        $groupBy->aggregate(sum(ref('v')));
+
+        $batches = (static function () {
+            yield rows(row(str_entry('k', 'a'), int_entry('v', 1)), row(str_entry('k', 'b'), int_entry('v', 10)));
+            yield rows(row(str_entry('k', 'a'), int_entry('v', 2)), row(str_entry('k', 'b'), int_entry('v', 20)));
+        })();
+
+        $sums = [];
+
+        foreach ((new BucketAggregation())->aggregate($batches, $context, $groupBy) as $resultRows) {
+            foreach ($resultRows as $resultRow) {
+                $key = $resultRow->valueOf(ref('k'));
+                assert(is_string($key));
+
+                $sums[$key] = $resultRow->valueOf(ref('v_sum'));
+            }
+        }
+
+        static::assertSame(['a' => 3, 'b' => 30], $sums);
+    }
+
+    public function test_first_preserves_input_order_across_batches(): void
+    {
+        $context = flow_context();
+
+        $groupBy = new GroupBy(ref('k'));
+        $groupBy->aggregate(first(ref('v')));
+
+        $batches = (static function () {
+            yield rows(row(str_entry('k', 'a'), int_entry('v', 100)));
+            yield rows(row(str_entry('k', 'a'), int_entry('v', 200)));
+        })();
+
+        $firsts = [];
+
+        foreach ((new BucketAggregation())->aggregate($batches, $context, $groupBy) as $resultRows) {
+            foreach ($resultRows as $resultRow) {
+                $key = $resultRow->valueOf(ref('k'));
+                assert(is_string($key));
+
+                $firsts[$key] = $resultRow->valueOf(ref('v_first'));
+            }
+        }
+
+        static::assertSame(['a' => 100], $firsts);
+    }
+
+    public function test_last_keeps_the_latest_across_batches(): void
+    {
+        $context = flow_context();
+
+        $groupBy = new GroupBy(ref('k'));
+        $groupBy->aggregate(last(ref('v')));
+
+        $batches = (static function () {
+            yield rows(row(str_entry('k', 'a'), int_entry('v', 100)));
+            yield rows(row(str_entry('k', 'a'), int_entry('v', 200)));
+        })();
+
+        $lasts = [];
+
+        foreach ((new BucketAggregation())->aggregate($batches, $context, $groupBy) as $resultRows) {
+            foreach ($resultRows as $resultRow) {
+                $key = $resultRow->valueOf(ref('k'));
+                assert(is_string($key));
+
+                $lasts[$key] = $resultRow->valueOf(ref('v_last'));
+            }
+        }
+
+        static::assertSame(['a' => 200], $lasts);
+    }
+}
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/GroupByTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/GroupByTest.php
index 2d97fc5e58..a34e301a1c 100644
--- a/src/core/etl/tests/Flow/ETL/Tests/Unit/GroupByTest.php
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/GroupByTest.php
@@ -6,9 +6,12 @@
 
 use Flow\ETL\Exception\InvalidArgumentException;
 use Flow\ETL\GroupBy;
+use Flow\ETL\Processor\GroupByProcessor;
+use Flow\ETL\Rows;
 use Flow\ETL\Tests\FlowTestCase;
 
 use function Flow\ETL\DSL\config;
+use function Flow\ETL\DSL\count;
 use function Flow\ETL\DSL\flow_context;
 use function Flow\ETL\DSL\int_entry;
 use function Flow\ETL\DSL\null_entry;
@@ -23,33 +26,26 @@ final class GroupByTest extends FlowTestCase
     public function test_group_by_missing_entry(): void
     {
         $groupBy = new GroupBy('type');
-
-        $groupBy->group(
-            rows(row(str_entry('type', 'a')), row(str_entry('not-type', 'b')), row(str_entry('type', 'c'))),
-            flow_context(),
-        );
+        $groupBy->aggregate(count());
 
         static::assertEquals(
-            rows(row(str_entry('type', 'a')), row(null_entry('type')), row(str_entry('type', 'c'))),
-            $groupBy->result(flow_context(config())),
+            rows(
+                row(str_entry('type', 'a'), int_entry('_count', 1)),
+                row(null_entry('type'), int_entry('_count', 1)),
+                row(str_entry('type', 'c'), int_entry('_count', 1)),
+            ),
+            $this->aggregate($groupBy, rows(
+                row(str_entry('type', 'a')),
+                row(str_entry('not-type', 'b')),
+                row(str_entry('type', 'c')),
+            )),
         );
     }
 
     public function test_group_by_with_aggregation(): void
     {
         $group = new GroupBy('type');
-
         $group->aggregate(sum(ref('id')));
-        $group->group(
-            rows(
-                row(int_entry('id', 1), str_entry('type', 'a')),
-                row(int_entry('id', 2), str_entry('type', 'b')),
-                row(int_entry('id', 3), str_entry('type', 'c')),
-                row(int_entry('id', 4), str_entry('type', 'a')),
-                row(int_entry('id', 5), str_entry('type', 'd')),
-            ),
-            flow_context(),
-        );
 
         static::assertEquals(
             rows(
@@ -58,7 +54,13 @@ public function test_group_by_with_aggregation(): void
                 row(int_entry('id_sum', 3), str_entry('type', 'c')),
                 row(int_entry('id_sum', 5), str_entry('type', 'd')),
             ),
-            $group->result(flow_context(config())),
+            $this->aggregate($group, rows(
+                row(int_entry('id', 1), str_entry('type', 'a')),
+                row(int_entry('id', 2), str_entry('type', 'b')),
+                row(int_entry('id', 3), str_entry('type', 'c')),
+                row(int_entry('id', 4), str_entry('type', 'a')),
+                row(int_entry('id', 5), str_entry('type', 'd')),
+            )),
         );
     }
 
@@ -72,27 +74,10 @@ public function test_group_by_with_empty_aggregations(): void
 
     public function test_group_by_with_pivoting(): void
     {
-        $rows = rows(
-            row(str_entry('product', 'Banana'), int_entry('amount', 1000), str_entry('country', 'USA')),
-            row(str_entry('product', 'Carrots'), int_entry('amount', 1500), str_entry('country', 'USA')),
-            row(str_entry('product', 'Beans'), int_entry('amount', 1600), str_entry('country', 'USA')),
-            row(str_entry('product', 'Orange'), int_entry('amount', 2000), str_entry('country', 'USA')),
-            row(str_entry('product', 'Orange'), int_entry('amount', 2000), str_entry('country', 'USA')),
-            row(str_entry('product', 'Banana'), int_entry('amount', 400), str_entry('country', 'China')),
-            row(str_entry('product', 'Carrots'), int_entry('amount', 1200), str_entry('country', 'China')),
-            row(str_entry('product', 'Beans'), int_entry('amount', 1500), str_entry('country', 'China')),
-            row(str_entry('product', 'Orange'), int_entry('amount', 4000), str_entry('country', 'China')),
-            row(str_entry('product', 'Banana'), int_entry('amount', 2000), str_entry('country', 'Canada')),
-            row(str_entry('product', 'Carrots'), int_entry('amount', 2000), str_entry('country', 'Canada')),
-            row(str_entry('product', 'Beans'), int_entry('amount', 2000), str_entry('country', 'Mexico')),
-        );
-
         $group = new GroupBy(ref('product'));
         $group->aggregate(sum(ref('amount')));
         $group->pivot(ref('country'));
 
-        $group->group($rows, flow_context());
-
         static::assertEquals(
             rows(
                 row(
@@ -124,29 +109,52 @@ public function test_group_by_with_pivoting(): void
                     int_entry('USA', 4000),
                 ),
             ),
-            $group->result(flow_context(config()))->sortBy(ref('product')),
+            $this->aggregate($group, rows(
+                row(str_entry('product', 'Banana'), int_entry('amount', 1000), str_entry('country', 'USA')),
+                row(str_entry('product', 'Carrots'), int_entry('amount', 1500), str_entry('country', 'USA')),
+                row(str_entry('product', 'Beans'), int_entry('amount', 1600), str_entry('country', 'USA')),
+                row(str_entry('product', 'Orange'), int_entry('amount', 2000), str_entry('country', 'USA')),
+                row(str_entry('product', 'Orange'), int_entry('amount', 2000), str_entry('country', 'USA')),
+                row(str_entry('product', 'Banana'), int_entry('amount', 400), str_entry('country', 'China')),
+                row(str_entry('product', 'Carrots'), int_entry('amount', 1200), str_entry('country', 'China')),
+                row(str_entry('product', 'Beans'), int_entry('amount', 1500), str_entry('country', 'China')),
+                row(str_entry('product', 'Orange'), int_entry('amount', 4000), str_entry('country', 'China')),
+                row(str_entry('product', 'Banana'), int_entry('amount', 2000), str_entry('country', 'Canada')),
+                row(str_entry('product', 'Carrots'), int_entry('amount', 2000), str_entry('country', 'Canada')),
+                row(str_entry('product', 'Beans'), int_entry('amount', 2000), str_entry('country', 'Mexico')),
+            ))->sortBy(ref('product')),
         );
     }
 
     public function test_group_by_with_pivoting_with_null_pivot_column(): void
     {
-        $rows = rows(
-            row(str_entry('product', 'Banana'), str_entry('country', 'USA'), int_entry('amount', 1000)),
-            row(str_entry('product', 'Apple'), str_entry('country', null), int_entry('amount', 400)),
-        );
-
         $group = new GroupBy(ref('product'));
         $group->aggregate(sum(ref('amount')));
         $group->pivot(ref('country'));
 
-        $group->group($rows, flow_context());
-
         static::assertEquals(
             rows(
                 row(str_entry('product', 'Apple'), null_entry('USA')),
                 row(str_entry('product', 'Banana'), int_entry('USA', 1000)),
             ),
-            $group->result(flow_context(config()))->sortBy(ref('product')),
+            $this->aggregate($group, rows(
+                row(str_entry('product', 'Banana'), str_entry('country', 'USA'), int_entry('amount', 1000)),
+                row(str_entry('product', 'Apple'), str_entry('country', null), int_entry('amount', 400)),
+            ))->sortBy(ref('product')),
         );
     }
+
+    private function aggregate(GroupBy $groupBy, Rows $input): Rows
+    {
+        $result = new Rows();
+
+        $output = (new GroupByProcessor($groupBy))->process((static fn() => yield $input)(), flow_context(config()));
+
+        /** @var Rows $batch */
+        foreach ($output as $batch) {
+            $result = $result->merge($batch);
+        }
+
+        return $result;
+    }
 }
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/Processor/GroupByProcessorTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/Processor/GroupByProcessorTest.php
index fa42188bb7..4bd42fca48 100644
--- a/src/core/etl/tests/Flow/ETL/Tests/Unit/Processor/GroupByProcessorTest.php
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/Processor/GroupByProcessorTest.php
@@ -35,14 +35,21 @@ public function test_groups_across_multiple_batches(): void
         /** @var list<Rows> $result */
         $result = iterator_to_array($processor->process($generator, flow_context()));
 
-        static::assertCount(1, $result);
+        $aggregated = [];
 
-        $resultArray = $result[0]->toArray();
-        static::assertCount(2, $resultArray);
+        foreach ($result as $batch) {
+            foreach ($batch->toArray() as $groupRow) {
+                $aggregated[] = $groupRow;
+            }
+        }
 
-        $categoryA = array_values(array_filter($resultArray, static fn(array $r): bool => $r['category'] === 'a'))[0];
+        static::assertCount(2, $aggregated);
 
-        static::assertEquals(30, $categoryA['amount_sum']);
+        $categoryA = array_values(array_filter($aggregated, static fn(array $r): bool => $r['category'] === 'a'))[0];
+        $categoryB = array_values(array_filter($aggregated, static fn(array $r): bool => $r['category'] === 'b'))[0];
+
+        static::assertSame(30, $categoryA['amount_sum']);
+        static::assertSame(15, $categoryB['amount_sum']);
     }
 
     public function test_groups_and_aggregates_rows(): void
@@ -63,16 +70,21 @@ public function test_groups_and_aggregates_rows(): void
         /** @var list<Rows> $result */
         $result = iterator_to_array($processor->process($generator, flow_context()));
 
-        static::assertCount(1, $result);
+        $aggregated = [];
+
+        foreach ($result as $batch) {
+            foreach ($batch->toArray() as $groupRow) {
+                $aggregated[] = $groupRow;
+            }
+        }
 
-        $resultArray = $result[0]->toArray();
-        static::assertCount(2, $resultArray);
+        static::assertCount(2, $aggregated);
 
-        $categoryA = array_values(array_filter($resultArray, static fn(array $r): bool => $r['category'] === 'a'))[0];
-        $categoryB = array_values(array_filter($resultArray, static fn(array $r): bool => $r['category'] === 'b'))[0];
+        $categoryA = array_values(array_filter($aggregated, static fn(array $r): bool => $r['category'] === 'a'))[0];
+        $categoryB = array_values(array_filter($aggregated, static fn(array $r): bool => $r['category'] === 'b'))[0];
 
-        static::assertEquals(30, $categoryA['amount_sum']);
-        static::assertEquals(15, $categoryB['amount_sum']);
+        static::assertSame(30, $categoryA['amount_sum']);
+        static::assertSame(15, $categoryB['amount_sum']);
     }
 
     public function test_handles_empty_input(): void
@@ -89,7 +101,12 @@ public function test_handles_empty_input(): void
         /** @var list<Rows> $result */
         $result = iterator_to_array($processor->process($generator, flow_context()));
 
-        static::assertCount(1, $result);
-        static::assertCount(0, $result[0]);
+        $total = 0;
+
+        foreach ($result as $batch) {
+            $total += $batch->count();
+        }
+
+        static::assertSame(0, $total);
     }
 }
diff --git a/web/landing/resources/api.json b/web/landing/resources/api.json
index 6fe86ab256..2def0635ca 100644
--- a/web/landing/resources/api.json
+++ b/web/landing/resources/api.json
@@ -1 +1 @@
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