branch-4.0: [fix](window) allow constant expression evaluation in LAG/LEAD offset parameter #58200#58261
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yiguolei merged 1 commit intobranch-4.0from Nov 25, 2025
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… parameter (#58200) ### What problem does this PR solve? Problem Summary: ``` mysql> select lag(k1,1+1,6) over() from test_query_qa.baseall; ERROR 1105 (HY000): errCode = 2, detailMessage = The offset parameter of LAG must be a constant positive integer: lag(k1, (1 + 1), 6) mysql> ``` before the function second param of offset must be a constant value. but 1 + 1 also should be support in offset params. ``` mysql> select lag(k1,1+1,6) over() from test_query_qa.baseall where k1 <= 3; +----------------------+ | lag(k1,1+1,6) over() | +----------------------+ | 6 | | 6 | | 3 | +----------------------+ ```
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Cherry-picked from #58200