Revert "prepared plan cache: Enable by default" (#5811)#5857

Merged

ti-chi-bot merged 1 commit intopingcap:release-5.0from ti-srebot:release-5.0-32c1a0bd8c0d

Mar 26, 2021

+9-5

Commits on Mar 26, 2021

cherry pick pingcap#5811 to release-5.0

Joyinqin
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