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34d136f92a
If libpq ran out of memory while constructing the result set, it would hang, waiting for more data from the server, which might never arrive. To fix, distinguish between out-of-memory error and not-enough-data cases, and give a proper error message back to the client on OOM. There are still similar issues in handling COPY start messages, but let's handle that as a separate patch. Michael Paquier, Amit Kapila and me. Backpatch to all supported versions.