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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2022/03/18 01:05:54 UTC

[GitHub] [calcite] zgramana opened a new pull request #2747: Adds UNION query performance regression test

zgramana opened a new pull request #2747:
URL: https://github.com/apache/calcite/pull/2747


   Per email group, this captures a change in behavior from 1.24 to 1.29.
   
   In 1.24, `UNION` and `UNION ALL` query plans were identical, with the
   exception of the `EnumerableUnion.all` value.
   
   In 1.29, the reproduced plan eliminates some `LogicalProject` nodes,
   resulting in the inability to pushdown projections of very
   wide tables, causing performance to regress sometimes rather
   a lot


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