fix(jindo): make async reads concurrency-safe

[zjw1111]

Purpose

Linked issue: N/A

JindoInputStream reused one member std::string_view across synchronous and concurrent asynchronous reads, and ignored failures returned by perform(). This could race between reads or leave a caller's completion callback unresolved.

This change:

• gives every asynchronous read an independent result and completion state
• completes the callback exactly once, including when perform() fails
• keeps synchronous read results local and documents the caller-side async lifetime contract
• adds real OSS coverage for concurrent sync/async reads and listing across an OSS page boundary
• introduces the opt-in PAIMON_ENABLE_JINDO_TESTS switch and enables Jindo cases in the existing filesystem and write/read integration test binaries

Tests

• cmake --build build --target paimon-fs-test -j64
• cmake --build build --target paimon-write-and-read-inte-test -j64
• Real OSS Jindo filesystem tests: 6 passed
• FsType/FileSystemTest.TestFactoryCreator/1
• FileFormatAndFileSystem/WriteAndReadInteTest.TestAppendSimple/1
• pre-commit run --files ...
• git diff --check

API and Format

Clarifies the existing InputStream::ReadAsync lifetime contract. No storage format or protocol changes.

Documentation

No user-facing documentation changes.

Generative AI tooling

Generated-by: OpenAI Codex (GPT-5)

[Copilot]

Pull request overview

This PR hardens the Jindo filesystem InputStream async read path to be concurrency-safe by removing shared per-instance read result state and ensuring async callbacks are completed exactly once, including when the underlying async task fails to start/perform. It also adds opt-in remote OSS-backed Jindo test coverage and clarifies the ReadAsync lifetime contract in the public API.

Changes:

• Refactor JindoInputStream::ReadAsync to use per-request state and to propagate perform() failures via the callback.
• Remove shared std::string_view member state from JindoInputStream and keep sync read results local.
• Add PAIMON_ENABLE_JINDO_TESTS CMake option and gate OSS-backed Jindo tests/integration test parameterization behind it.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/inte/write_and_read_inte_test.cpp	Conditionally enables "jindo" test matrix entries when PAIMON_ENABLE_JINDO_TESTS is set.
test/inte/CMakeLists.txt	Adds PAIMON_ENABLE_JINDO_TESTS compile definition to the write/read integration test target when enabled.
src/paimon/fs/jindo/jindo_file_system.h	Removes shared std::string_view member from JindoInputStream.
src/paimon/fs/jindo/jindo_file_system.cpp	Implements per-async-read state + callback completion-on-perform-failure for concurrency safety.
src/paimon/fs/jindo/jindo_file_system_test.cpp	Adds OSS-backed tests for listing across page boundaries and concurrent sync/async reads.
src/paimon/common/fs/file_system_test.cpp	Conditionally includes "jindo" in filesystem unit test parameters when PAIMON_ENABLE_JINDO_TESTS is set.
src/paimon/CMakeLists.txt	Gates Jindo filesystem test sources/link libs and test compile definitions behind PAIMON_ENABLE_JINDO_TESTS.
include/paimon/fs/file_system.h	Clarifies InputStream::ReadAsync caller lifetime requirements in the public API doc.
CMakeLists.txt	Introduces PAIMON_ENABLE_JINDO_TESTS option and enforces option dependencies.
cmake_modules/DefineOptions.cmake	Exposes PAIMON_ENABLE_JINDO_TESTS via the project’s option definition helpers.

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