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[flink] Fix decimal column analysis with null statistics #9469

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Merged
JingsongLi merged 1 commit into from
Aug 30, 2026
+21 −4
Merged

[flink] Fix decimal column analysis with null statistics #9469

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14 changes: 10 additions & 4 deletions ...flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/utils/TableStatsUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -212,17 +212,23 @@ private static ColStats<?> getPaimonColStats(
null,
null);
} else if (typeRoot.equals(DataTypeRoot.DECIMAL)) {
BigDecimal max = BigDecimal.valueOf(doubleColumnStatsData.getMax());
BigDecimal min = BigDecimal.valueOf(doubleColumnStatsData.getMin());
BigDecimal max =
doubleColumnStatsData.getMax() == null
? null
: BigDecimal.valueOf(doubleColumnStatsData.getMax());
BigDecimal min =
doubleColumnStatsData.getMin() == null
? null
: BigDecimal.valueOf(doubleColumnStatsData.getMin());
return ColStats.newColStats(
field.id(),
null != doubleColumnStatsData.getNdv()
? doubleColumnStatsData.getNdv()
: null,
null != doubleColumnStatsData.getMin()
min != null
? Decimal.fromBigDecimal(min, min.precision(), min.scale())
: null,
null != doubleColumnStatsData.getMax()
max != null
? Decimal.fromBigDecimal(max, max.precision(), max.scale())
: null,
null != doubleColumnStatsData.getNullCount()
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11 changes: 11 additions & 0 deletions ...nk/paimon-flink-common/src/test/java/org/apache/paimon/flink/FlinkAnalyzeTableITCase.java
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,17 @@ public void testAnalyzeTable() throws Catalog.TableNotExistException {
assertThat(newStats.get()).isSameAs(stats);
}

@Test
public void testAnalyzeAllNullDecimalColumn() throws Catalog.TableNotExistException {
sql("CREATE TABLE T (id INT, amount DECIMAL(10, 2))");
sql("INSERT INTO T VALUES (1, CAST(NULL AS DECIMAL(10, 2)))");

sql("ANALYZE TABLE T COMPUTE STATISTICS FOR ALL COLUMNS");

ColStats<?> decimalStats = paimonTable("T").statistics().get().colStats().get("amount");
assertThat(decimalStats).isEqualTo(ColStats.newColStats(1, 0L, null, null, 1L, null, null));
}

@Test
public void testAnalyzeTableColumn() throws Catalog.TableNotExistException {
sql(
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