planner, util: new unfixed mutrow for TypeNull (#17893) #17935
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cherry-pick #17893 to release-3.0
What problem does this PR solve?
Issue Number: close #16027 #6252
Problem Summary:
TypeNull should be handled as unfixedLen field type. refer MySQL: https://github.com/mysql/mysql-server/blob/8.0/sql/field.h#L151
What is changed and how it works?
What's Changed:
makeMutRowBytesColumnfornilHow it Works:
The reason is mentioned in #15512 (comment).
Related changes
Check List
Tests
Side effects
N/A
Release note