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In bms_add_member(), use repalloc() if the bms needs to be enlarged.
Previously bms_add_member() would palloc a whole-new copy of the existing set, copy the words, and pfree the old one. repalloc() is potentially much faster, and more importantly, this is less surprising if CurrentMemoryContext is not the same as the context the old set is in. bms_add_member() still allocates a new bitmapset in CurrentMemoryContext if NULL is passed as argument, but that is a lot less likely to induce bugs. Nicholas White.
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