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cherry-pick branch-4.1 : [Improve](Variant) Keep first duplicate Variant JSON path - #63697
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morningman merged 1 commit intoMay 27, 2026
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### What problem does this PR solve? Issue Number: None Related PR: apache#63082 Problem Summary: Pick apache#63082 to branch-4.0. Add disabled-by-default duplicate Variant JSON path checking so Variant JSON parsing can keep the first value for duplicate normalized leaf paths and avoid inconsistent subcolumns during load/parsing. Adapt the implementation to branch-4.0's vec/json parser and parse2column flow. ### Release note Add BE config variant_enable_duplicate_json_path_check to keep the first duplicate Variant JSON leaf path when enabled. The default value is false. ### Check List (For Author) - Test: Unit Test - Unit Test: ./run-be-ut.sh --run --filter='JsonParserTest.*DuplicateJsonPath*:SchemaUtilTest.TestParseVariantColumnsDuplicateJsonPathCheck' - Format: PATH=/mnt/disk1/claude-max/ldb_toolchain16/bin:$PATH ./build-support/clang-format.sh - Static check: git diff --cached --check - Regression test: Not run (no local ASAN output cluster available in the fresh branch-4.0 checkout) - Behavior changed: Yes. When variant_enable_duplicate_json_path_check is enabled, duplicate normalized Variant JSON leaf paths keep the first parsed value. The default value is false. - Does this need documentation: No (cherry picked from commit f563b2e)
hello-stephen
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May 26, 2026
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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eldenmoon
commented
May 26, 2026
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run buildall |
eldenmoon
marked this pull request as ready for review
May 27, 2026 01:27
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Pull request overview
This cherry-pick introduces an optional BE-side behavior change for Variant JSON parsing: when enabled, duplicate JSON paths (including normalization between dotted keys and nested objects) keep the first encountered value instead of erroring/overwriting.
Changes:
- Add BE config
variant_enable_duplicate_json_path_checkand plumb it into Variant parsing/segment writers. - Enhance the JSON parser and Variant subcolumn materialization to de-duplicate normalized paths (keep-first semantics).
- Add unit + regression coverage for duplicate-path scenarios (SQL insert + stream load + compaction).
Reviewed changes
Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| regression-test/suites/variant_p0/duplicate_json_path.groovy | New regression suite validating keep-first behavior across inserts/stream load and after compaction. |
| regression-test/data/variant_p0/duplicate_json_path.json | Stream load data covering duplicate key/path edge cases. |
| be/test/vec/jsonb/json_parser_test.cpp | Unit tests for keep-first behavior and dotted-vs-nested normalization at the JSON parser level. |
| be/test/vec/common/schema_util_test.cpp | Unit test ensuring Variant subcolumn parsing keeps the first value for duplicate paths. |
| be/src/vec/json/parse2column.cpp | Normalize “plain” paths when duplicate-path check is enabled so dotted/nested map to the same Variant subcolumns. |
| be/src/vec/json/json_parser.h | Extend parse config/context to support duplicate-path checking. |
| be/src/vec/json/json_parser.cpp | Implement keep-first de-duplication during traversal via appendValueIfNotDuplicate. |
| be/src/vec/data_types/serde/data_type_variant_serde.cpp | Apply the new BE config when deserializing Variant from JSON. |
| be/src/olap/rowset/segment_v2/vertical_segment_writer.cpp | Pass duplicate-path config into Variant parsing during segment writing. |
| be/src/olap/rowset/segment_v2/segment_writer.cpp | Pass duplicate-path config into Variant parsing during segment writing. |
| be/src/olap/rowset/segment_creator.cpp | Pass duplicate-path config into Variant parsing during segment flushing. |
| be/src/common/config.h | Declare variant_enable_duplicate_json_path_check. |
| be/src/common/config.cpp | Define default value for variant_enable_duplicate_json_path_check. |
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| } | ||
| if (subcolumn->size() != old_num_rows) { | ||
| throw doris::Exception(ErrorCode::INVALID_ARGUMENT, | ||
| "subcolumn {} size missmatched, may contains duplicated entry", |
hello-stephen
commented
May 27, 2026
Contributor
BE Regression && UT Coverage ReportIncrement line coverage Increment coverage report
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morningman
approved these changes
May 27, 2026
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Pick #63082 to branch-4.0.