Fix merge(how=left, left_on=, right_index=True, sort=True) #18166
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Matt711
approved these changes
Mar 4, 2025
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Description
closes #18153
This fix a bit more conservative than what was initially done in #17739.
Before, we were modifying the
_using_left_index/_using_right_indexattributes which affects other merge operations besides setting the result index. Now, this PR scopes a specific attribute to determine when to set aRangeIndexin the resultChecklist