feat(compact): add FieldListaggAgg aggregate function#224
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Pull request overview
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Adds a new listagg field aggregate for MergeTree compaction to concatenate string values with configurable delimiter support, including an optional distinct/dedup mode.
Changes:
- Introduce
FieldListaggAggaggregator and wire it intoFieldAggregatorFactory. - Add new field-level options for
list-agg-delimiteranddistinctviaCoreOptions/Options. - Add unit tests covering delimiter/null/empty/distinct/type-validation scenarios.
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.
Show a summary per file
| File | Description |
|---|---|
| src/paimon/core/mergetree/compact/aggregate/field_listagg_agg.h | Implements listagg aggregation, including distinct token deduplication logic. |
| src/paimon/core/mergetree/compact/aggregate/field_aggregator_factory.h | Registers listagg in the aggregator factory. |
| src/paimon/core/core_options.h | Adds CoreOptions accessors for listagg delimiter and distinct mode. |
| src/paimon/core/core_options.cpp | Implements option parsing for delimiter and distinct mode. |
| include/paimon/defs.h | Declares new option keys (distinct, list-agg-delimiter). |
| src/paimon/common/defs.cpp | Defines the new option key constants. |
| src/paimon/core/mergetree/compact/aggregate/field_listagg_agg_test.cpp | Adds unit tests for listagg behavior and validation. |
| src/paimon/CMakeLists.txt | Adds the new test file to the test build. |
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- Reject empty delimiter when distinct is enabled to prevent
infinite loop in AggDistinctImpl (find("") always returns 0)
- Pre-reserve string capacity and use append() instead of +=
in AggDistinctImpl to avoid repeated reallocations
- Replace assert() with gtest ADD_FAILURE() in test CreateOptions()
to ensure failures are reported properly even under NDEBUG
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
lxy-9602
reviewed
Apr 14, 2026
Collaborator
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Great work! Thanks for enhancing the aggregation functionality! |
lszskye
reviewed
Apr 14, 2026
lszskye
reviewed
Apr 14, 2026
lszskye
reviewed
Apr 14, 2026
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
lxy-9602
reviewed
Apr 15, 2026
Collaborator
|
By the way, your change helped us identify a bug in the Java implementation: We're preparing a PR today to fix this on the Java side — thanks for catching this discrepancy! |
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Summary
Add
listaggaggregate function for MergeTree compaction. Concatenatesstring values with a configurable delimiter, with optional distinct mode
to deduplicate tokens.
Test plan
Unit tests cover null handling, empty strings, custom delimiters,
distinct dedup, and type validation.
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