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release-22.2: opt: fixup CTE stats on placeholder queries #100327

Merged
merged 1 commit into from
Apr 3, 2023
Merged

release-22.2: opt: fixup CTE stats on placeholder queries #100327

merged 1 commit into from
Apr 3, 2023

Commits on Mar 31, 2023

  1. opt: fixup CTE stats on placeholder queries 

    During optbuilder phase we copy the initial expressions stats into the
fake-rel but this value can change when placeholders are assigned so add
code in AssignPlaceholders to rebuild the cte if the stats change.

Fixes: cockroachdb#99389
Epic: none
Release note (sql change): Prepared statements using placeholders in
recursive CTEs sometimes did not re-optimize correctly after plugging
in the parameters leading to poor plan choices, this has been fixed.
    @cucaroach
    cucaroach committed Mar 31, 2023
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