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Unnecessary ORDER BY expressions
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
When an expression is repeated in the ORDER BY clause, then the second one can be removed as it has no effect - even if it has a different value for ASC, DESC, NULLS.
Using Settings.transformPatternsUnnecessaryOrderByExpressions, the following transformations can be achieved:
-- With Settings.transformPatternsUnnecessaryOrderByExpressions active, this: SELECT a, b FROM t ORDER BY a DESC, b, a ASC; -- ... is transformed into the equivalent expression: SELECT a, b FROM t GROUP BY a DESC, b;
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