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opt: prefer sorting fewer columns #60469

Merged
merged 1 commit into from
Feb 11, 2021
Merged

opt: prefer sorting fewer columns #60469

merged 1 commit into from
Feb 11, 2021

Commits on Feb 11, 2021

  1. opt: prefer sorting fewer columns 

    Currently, if we have to sort results and project a new column, there
is no cost difference between the two orders and we happen to prefer
the sort on top. It is preferable to sort before adding new columns to
avoid storing the extra value in memory or on disk.

This change improves the sort costing by adding a cost proportional to
the total number of values.

Fixes cockroachdb#32952.
    @RaduBerinde
    RaduBerinde committed Feb 11, 2021
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