Skip null checks for positions from blocks that have no nulls in aggr…#14567
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sopel39 merged 1 commit intotrinodb:masterfrom Nov 15, 2022
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Skip null checks for positions from blocks that have no nulls in aggr…#14567sopel39 merged 1 commit intotrinodb:masterfrom
sopel39 merged 1 commit intotrinodb:masterfrom
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Using io.trino.spi.block.Block.mayHaveNull it can be detected that there are no null positions in the block. Basing on that we skip checking nullability of every postition for such blocks in the aggregation `input` method for performance reason.
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Using
io.trino.spi.block.Block.mayHaveNullit can be detected that there are no null positions in the block. Basing on that we skip checking nullability of every postition for such blocks in the aggregationinputmethod for performance reason.Performance results (cpu time, parquet, unpart, sf1000)
tpch: -1.77% (average for two runs)
tpcds: -1.61% (average for two runs)
For queries where aggregation is a significant operator there is more gain, like 4-5% cpu time gain, for example:
q06,q12 in tpch and q09 / q28 in tpcds
full report:
serial benchmarks.pdf
(* ) This is not user-visible or docs only and no release notes are required.
( ) Release notes are required, please propose a release note for me.
( ) Release notes are required, with the following suggested text:
(*) Release note is optional: Improved performance for aggregation