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aadf7db66e
The only practical effect of these changes is to avoid a useless list_copy() operation when there is a single hashclause. That's never going to make any noticeable performance difference, but the code is arguably clearer this way, especially if we take the opportunity to add some comments so that readers don't have to reverse-engineer the usage of these local variables. Also add some braces for better/more consistent style. Author: Tender Wang <tndrwang@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAHewXNnHBOO9NEa=NBDYOrwZL4oHu2NOcTYvqyNyWEswo8f5OQ@mail.gmail.com