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opt: improve the rule that converts COUNT to COUNT_ROWS #49126

Merged
merged 1 commit into from May 18, 2020
Merged

opt: improve the rule that converts COUNT to COUNT_ROWS #49126

merged 1 commit into from May 18, 2020

Commits on May 17, 2020

  1. opt: improve the rule that converts COUNT to COUNT_ROWS 

    Improve the ConvertCountToCountRows rule to check for any scalar expression that
is never null, not just bare variable references.

Release note (performance improvement): `COUNT` is now converted to `COUNT(*)`
(aka `COUNT_ROWS`) in more cases.
    @RaduBerinde
    RaduBerinde committed May 17, 2020
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