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This representation saves 8 bytes per tuple compared to HeapTuple, and avoids the need to allocate, copy and free on the receiving side. Gather can emit the returned MinimalTuple directly, but GatherMerge now needs to make an explicit copy because it buffers multiple tuples at a time. That should be no worse than before. Reviewed-by: Soumyadeep Chakraborty <soumyadeep2007@gmail.com> Discussion: https://postgr.es/m/CA%2BhUKG%2B8T_ggoUTAE-U%3DA%2BOcPc4%3DB0nPPHcSfffuQhvXXjML6w%40mail.gmail.com
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