planner/core: fix duplicate enum items (#26145)#26202
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cherry-pick #26145 to release-5.1
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# In tidb repo: git pr https://github.com/pingcap/tidb/pull/26202After apply modifications, you can push your change to this PR via:
What problem does this PR solve?
Issue Number: close #25955
Problem Summary:
In this pr: #23203 , I support enum push down for only mpp exchanger. However, a month later this pr: #22686 is merged to support general enum type push-down. This leads to the elem lists are appended two times.
What is changed and how it works?
What's Changed:
Remove the #23203 code
Check List
Tests
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Documentation
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