planner: fix different err msg from MySQL when group by window function (#16134) #16427
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cherry-pick #16134 to release-3.1
What problem does this PR solve?
Issue Number: close #11518
Problem Summary: When GROUP BY is followed by a number in a select stmt and this number correspond to a window function in select fields, TiDB prints a different error message from MySQL.
What is changed and how it works?
What's Changed: When dealing with ast.PositionExpr in gbyResolver's Leave() method, we check if it's a ast.WindowFuncExpr. If so, ErrWrongGroupField will occur, which is expected.
Check List
Tests