afb529e677
Before this patch, there was some code that tried to make sure that the buffer was always big enough at the start, and then asserted that it didn't need to be enlarged later. However, the code to make sure it was big enough at the start doesn't actually work, and therefore it was possible to fail an assertion and crash later. Remove the code that tries to make sure the buffer is always big enough at the start in favor of enlarging the buffer as we go along whenever that is necessary. The mistake probably happened because, on the server side, we do actually need to guarantee that the buffer is big enough at the start to avoid subsequent resizings. However, in that case, the calling code makes promises about how much data it will provide at once, but here, that's not the case. Report by Justin Pryzby. Analysis by me. Patch by Dipesh Pandit. Discussion: http://postgr.es/m/20220330143536.GG28503@telsasoft.com
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