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Prevent segfault in expand_tuple with no missing values

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Commit 16828d5c forgot to check that it had a set of missing values
before trying to retrieve a value from it.

An additional query to add coverage for this code is added to the
regression test.

Per bug report from Andreas Seltenreich.
This commit is contained in:
Andrew Dunstan
2018-04-13 16:43:33 -04:00
parent 8bf358c18e
commit 7c44c46deb
3 changed files with 50 additions and 1 deletions
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2
src/backend/access/common/heaptuple.c
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@ -981,7 +981,7 @@ expand_tuple(HeapTuple *targetHeapTuple,
Form_pg_attribute attr = TupleDescAttr(tupleDesc, attnum);
if (attrmiss[attnum].ammissingPresent)
if (attrmiss && attrmiss[attnum].ammissingPresent)
{
fill_val(attr,
nullBits ? &nullBits : NULL,