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Fix varatt versus Datum type confusions

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Macros like VARDATA() and VARSIZE() should be thought of as taking
values of type pointer to struct varlena or some other related struct.
The way they are implemented, you can pass anything to it and it will
cast it right.  But this is in principle incorrect.  To fix, add the
required DatumGetPointer() calls.  Or in a couple of cases, remove
superfluous PointerGetDatum() calls.

It is planned in a subsequent patch to change macros like VARDATA()
and VARSIZE() to inline functions, which will enforce stricter typing.
This is in preparation for that.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/928ea48f-77c6-417b-897c-621ef16685a6%40eisentraut.org
This commit is contained in:
Peter Eisentraut
2025-08-05 12:11:36 +02:00
parent 2ad6e80de9
commit 0f5ade7a36
23 changed files with 65 additions and 66 deletions
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2
contrib/test_decoding/test_decoding.c
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@@ -581,7 +581,7 @@ tuple_to_stringinfo(StringInfo s, TupleDesc tupdesc, HeapTuple tuple, bool skip_
/* print data */
if (isnull)
appendStringInfoString(s, "null");
else if (typisvarlena && VARATT_IS_EXTERNAL_ONDISK(origval))
else if (typisvarlena && VARATT_IS_EXTERNAL_ONDISK(DatumGetPointer(origval)))
appendStringInfoString(s, "unchanged-toast-datum");
else if (!typisvarlena)
print_literal(s, typid,