Zoltán Borók-Nagy created IMPALA-13088:
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Summary: Speedup IcebergDeleteBuilder
Key: IMPALA-13088
URL: https://issues.apache.org/jira/browse/IMPALA-13088
Project: IMPALA
Issue Type: Improvement
Reporter: Zoltán Borók-Nagy
When there are lots of delete records IcebergDeleteBuilder can become a
bottleneck. Since the left side of the JOIN is blocked on the build side any
improvement we make here significantly improves Iceberg V2 table scanning.
* std vector growths need lots of re-allocations and memory copies
* inserting into the position vectors one-by-one is inefficient
* sorting the position vectors could be parallelized (especially in case of
MT_DOP when there are MT_DOP threads blocked on the build)
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