tidb_query: add is true/false keep null ScalarFuncSig (#7532) #7565
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cherry-pick #7532 to release-3.0
Signed-off-by: zhongzc zhongzc_arch@outlook.com
What problem does this PR solve?
Close: pingcap/tidb/issues/15718 pingcap/tidb/issues/15987
Related PR: pingcap/tidb/pull/15718 pingcap/tidb/pull/15987
What is changed and how it works?
Implement
ScalarFuncSig::XXXXIsTrueWithNull
s,ScalarFuncSig::XXXXIsFalseWithNull
sCheck List
Tests