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This PR builds count-min sketch when analyze and use it for point queries. Especially, we do not build it for primary key when it is handle and the unique index.
PTAL @coocood @hanfei1991 @winoros @zz-jason
*: collect and use count-min sketch
Merge branch 'master' of github.com:pingcap/tidb into cms
load cm sketch by need
Should we merge this PR after TiKV support count-min sketch?
@shenli We can, but do not have to, because the code does not assume that tikv will build count-min sketch despite we send the request.
address comment and remove useless error
pre-allocate space for proto sketch
Merge branch 'master' into cms