planner: fix the inappropriate heuristic rule to estimate the EQ selectivity when out of range (#18543)#18995

Closed

ti-srebot wants to merge 1 commit intopingcap:release-3.1from ti-srebot:release-3.1-aeee1524e40c

+101-14

Commits on Aug 5, 2020

cherry pick pingcap#18543 to release-3.1

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