ddl: fix sequence default value will cause primary-key occur not-null error (#16437) #16510
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cherry-pick #16437 to release-4.0
What problem does this PR solve?
close bug competition issue #11
What is changed and how it works?
if the default is expr(sequence expr), return nil directly in function
checkDefaultValueotherwise will cause some primary key check problem.
Check List
Tests
Release note: ddl: fix sequence default value will cause primary-key occur not-null error