Finding Distinct Values Quickly
SQL Performance
MARCH 17, 2020
Back in 2014, I wrote an article called Performance Tuning the Whole Query Plan. The Sort only has 19 rows to process, so it consumes only 1ms or so. The parallel column store aggregate push down result of 57 million rows processed in 7ms (using 40ms of CPU) is remarkable, especially considering the hardware.
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