Hi, In postgresAcquireSampleRowsFunc, we 1) determine the fetch size and then 2) construct the fetch command in each iteration of fetching some rows from the remote, but that would be totally redundant. Attached is a patch for removing that redundancy.
I'll add this to the upcoming commitfest. Best regards, Etsuro Fujita
postgresAcquireSampleRowsFunc.patch
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