planner: set dbName for hinted query block table alias (#21213) #21380
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cherry-pick #21213 to release-4.0
What problem does this PR solve?
Issue Number: close #15972
Problem Summary:
Hint does not take effect for query block table alias.
What is changed and how it works?
What's Changed:
RC for the ineffective hint is query block table alias has empty dbName, which is different with the specified hint. Set the dbName as CurrentDB if it is empty.
Related changes
Check List
Tests
Side effects
N/A
Release note