planner: prune duplicate expr in sort (#20325) #20333
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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cherry-pick #20325 to release-4.0
What problem does this PR solve?
Issue Number: close #20322
Problem Summary: Duplicated ORDER BY condition causes bad execution plan
What is changed and how it works?
What's Changed: Duplicated expressions are pruned from the logical plan during the preprocessing phase
How it Works: Iterate through the ByItems in the sort plan in order and prune columns that have already been seen. Any duplicates found are always noop sort steps.
Check List
Tests
Side effects
Release note