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sql: Add more efficient implementation of min, max, sum, avg aggregates when used as window functions. #26988

Merged
merged 1 commit into from
Jul 16, 2018
Merged

sql: Add more efficient implementation of min, max, sum, avg aggregates when used as window functions. #26988

merged 1 commit into from
Jul 16, 2018

Commits on Jul 16, 2018

  1. sql: Add efficient min, max, sum, avg when used as window functions 

    Adds linear-time implementations of min, max, sum, and avg
(using sliding window approach) instead of naive quadratic
version.

Addresses: cockroachdb#26464.

Bonus: min and max are an order of magnitude faster than PG
(when window frame doesn't include the whole partition).

Release note (performance improvement): min, max, sum, avg
now take linear time when used for aggregation as window
functions for all supported window frame options.
    @yuzefovich
    yuzefovich committed Jul 16, 2018
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