pick: #42256
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
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Co-authored-by: LiBinfeng <libinfeng@selectdb.com>
bp #42882#43246#43336
We pick these PRs together because they all fix one problem and if not
do so, the regression test won't be passed.
---------
Co-authored-by: Sun Chenyang <csun5285@gmail.com>
Co-authored-by: qidaye <luen@selectdb.com>
### What problem does this PR solve?
pick #43000
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nereids will parse function statement when replay create alias function,
when do parse, need to get sql mode and other variable. because replay
thread do not have connect context, NPE be thrown when parsing
