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[improve](partition_topn) Add partition threshold check in hash table…
… to control partition nums (#39057) ## Proposed changes 1. Add a session variable to control partition_topn partition threshold 2. move the partition threshold check at emplace data to hash table to control partition nums, so get check every rows. this could improve some bad case about 50%+ performance improvement, and some better case before, after move the check in hash table, maybe have performance degradation almost 10%, I think this is within the acceptable result。 <!--Describe your changes.-->
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