executor: make the aggregation function distinct consider collations (#17182)
#17240
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cherry-pick #17182 to release-4.0
What problem does this PR solve?
Issue Number: close #16668
Problem Summary: the aggregation function
distinctdoesn't consider collationsWhat is changed and how it works?
Check collation when comparing strings in aggregation function
distinct.Check List
Tests
Release note
distinctconsider collations