HIVE-28329: Fix vectorized col * CASE decimal multiply returning zero#6575
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HIVE-28329: Fix vectorized col * CASE decimal multiply returning zero#6575kokila-19 wants to merge 1 commit into
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Preserve inputColumnNum column refs when re-instantiating DECIMAL parents after DECIMAL_64 child conversion and refresh projectedOutputColumns.
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What changes were proposed in this pull request?
Fix HIVE-28329 in Vectorizer.java: preserve column inputs when re-instantiating DECIMAL multiply after DECIMAL_64→DECIMAL conversion and refresh projectedOutputColumns.
Added qtest vector_decimal64_col_multiply_case_subquery_join.q.
Why are the changes needed?
With CBO and vectorization enabled, expressions like col3 * CASE(...) are vectorized with the CASE as DECIMAL_64 and the multiply expecting DECIMAL. When fixDecimalDataTypePhysicalVariations() wraps the CASE with ConvertDecimal64ToDecimal and re-builds the multiply, the old code only used child expressions. So, col3 in inputColumnNum[] was dropped and a stale scratch column (often 0) was used instead.
That led to wrong multiply inputs and stale projectedOutputColumns, so HIVE-28329 returned 0.000000000 instead of 0.000197260.
Disabling vectorization avoided this broken path.
Does this PR introduce any user-facing change?
Yes, a bug fix. Affected queries now return correct decimal results. No new config or syntax.
How was this patch tested?
qtest: vector_decimal64_col_multiply_case_subquery_join.q
Manual test: EXPLAIN before/after to confirm multiply wiring col2, col19 vs col19, col9