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Fast default trigger and expand_tuple fixes

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Ensure that triggers get properly filled in tuples for the OLD value.
Also fix the logic of detecting missing null values. The previous logic
failed to detect a missing null column before the first missing column
with a default. Fixing this has simplified the logic a bit.

Regression tests are added to test changes. This should ensure better
coverage of expand_tuple().

Original bug reports, and some code and test scripts from Tomas Vondra

Backpatch to release 11.
This commit is contained in:
Andrew Dunstan
2018-09-24 16:11:24 -04:00
parent bfdd02f88b
commit 9625ab7924
4 changed files with 328 additions and 33 deletions
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5
src/backend/commands/trigger.c
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@ -3396,7 +3396,10 @@ ltrmark:;
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
}
result = heap_copytuple(&tuple);
if (HeapTupleHeaderGetNatts(tuple.t_data) < relation->rd_att->natts)
result = heap_expand_tuple(&tuple, relation->rd_att);
else
result = heap_copytuple(&tuple);
ReleaseBuffer(buffer);
return result;