executor: fix wrong result for index merge read generate column (#16002) #16359
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cherry-pick #16002 to release-4.0
What problem does this PR solve?
Issue Number: close #15994
Problem Summary: When an index merge reader reads the generated column, it gets the wrong result. Because the generated column is ignored in the final table reader stage.
What is changed and how it works?
What's Changed: deal the generated column for final table reader.
Related changes
Check List
Tests
Side effects