I wrote:
> Yeah. The intent of the protocol design was that the recipient could
> skip over the correct number of bytes even if it didn't have room to
> buffer them, but the memory allocation mechanism in the backend makes
> it difficult to actually do that. Now that we have PG_TRY, though,
> it might not be out of reach to do it right.
And indeed it wasn't. Patch committed.
regards, tom lane
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
