Tom Lane wrote:
That test is a no-op in the case where hashp->alloc in fact points to
palloc.  But it doesn't always point there --- see shmem_alloc.

Perhaps it would be a net win to change ShmemAlloc() to elog(ERROR) on out-of-memory? A fair few of the ShmemAlloc() call sites don't bother to check the return value anyway, and a few more just elog(ERROR). For the few cases when we do need to do some cleanup, PG_TRY() could be used, or we could just provide a variant of ShmemAlloc() that returns NULL on OOM and could be used when error recovery is required.


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