Fwiw it looks like the LLVM folk think this is an asan bug.


It looks like the fix is that the compiler should avoid this
optimization if the code is being compiled with instrumentation. This
worries me a bit but I think our code is safe as the Datum will always
be either palloced which will be fully aligned and therefore can't
overrun a page or on a stack in which case the whole struct will be
allocated regardless of how many digits we need.

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