On Thu, 26 Oct 2023 at 08:43, Tom Lane <t...@sss.pgh.pa.us> wrote:
> I think that we can make that assumption starting with v17.
> Back-patching it would be hazardous perhaps; but if there's some
> function out there that depends on NUL termination, testing should
> expose it before too long. Wouldn't hurt to mention this explicitly
> as a possible incompatibility in the commit message.
>
> Looking over the v5 patch, I have some nits:
Thanks for looking at this again. I fixed up each of those and pushed
the result, mentioning the incompatibility in the commit message.
Now that that's done, I've attached a patch which makes use of the new
initReadOnlyStringInfo initializer function for the original case
mentioned when I opened this thread. I don't think there are any
remaining objections to this, but I'll let it sit for a bit to see.
David
diff --git a/src/backend/utils/adt/array_userfuncs.c
b/src/backend/utils/adt/array_userfuncs.c
index c831a9395c..57bd7e82bc 100644
--- a/src/backend/utils/adt/array_userfuncs.c
+++ b/src/backend/utils/adt/array_userfuncs.c
@@ -723,12 +723,11 @@ array_agg_deserialize(PG_FUNCTION_ARGS)
sstate = PG_GETARG_BYTEA_PP(0);
/*
- * Copy the bytea into a StringInfo so that we can "receive" it using
the
- * standard recv-function infrastructure.
+ * Initialize a StringInfo so that we can "receive" it using the
standard
+ * recv-function infrastructure.
*/
- initStringInfo(&buf);
- appendBinaryStringInfo(&buf,
- VARDATA_ANY(sstate),
VARSIZE_ANY_EXHDR(sstate));
+ initReadOnlyStringInfo(&buf, VARDATA_ANY(sstate),
+ VARSIZE_ANY_EXHDR(sstate));
/* element_type */
element_type = pq_getmsgint(&buf, 4);
@@ -815,7 +814,6 @@ array_agg_deserialize(PG_FUNCTION_ARGS)
}
pq_getmsgend(&buf);
- pfree(buf.data);
PG_RETURN_POINTER(result);
}
@@ -1124,12 +1122,11 @@ array_agg_array_deserialize(PG_FUNCTION_ARGS)
sstate = PG_GETARG_BYTEA_PP(0);
/*
- * Copy the bytea into a StringInfo so that we can "receive" it using
the
- * standard recv-function infrastructure.
+ * Initialize a StringInfo so that we can "receive" it using the
standard
+ * recv-function infrastructure.
*/
- initStringInfo(&buf);
- appendBinaryStringInfo(&buf,
- VARDATA_ANY(sstate),
VARSIZE_ANY_EXHDR(sstate));
+ initReadOnlyStringInfo(&buf, VARDATA_ANY(sstate),
+ VARSIZE_ANY_EXHDR(sstate));
/* element_type */
element_type = pq_getmsgint(&buf, 4);
@@ -1187,7 +1184,6 @@ array_agg_array_deserialize(PG_FUNCTION_ARGS)
memcpy(result->lbs, temp, sizeof(result->lbs));
pq_getmsgend(&buf);
- pfree(buf.data);
PG_RETURN_POINTER(result);
}
diff --git a/src/backend/utils/adt/numeric.c b/src/backend/utils/adt/numeric.c
index 3c3184f15b..bf61fd7dbc 100644
--- a/src/backend/utils/adt/numeric.c
+++ b/src/backend/utils/adt/numeric.c
@@ -5190,12 +5190,11 @@ numeric_avg_deserialize(PG_FUNCTION_ARGS)
init_var(&tmp_var);
/*
- * Copy the bytea into a StringInfo so that we can "receive" it using
the
- * standard recv-function infrastructure.
+ * Initialize a StringInfo so that we can "receive" it using the
standard
+ * recv-function infrastructure.
*/
- initStringInfo(&buf);
- appendBinaryStringInfo(&buf,
- VARDATA_ANY(sstate),
VARSIZE_ANY_EXHDR(sstate));
+ initReadOnlyStringInfo(&buf, VARDATA_ANY(sstate),
+ VARSIZE_ANY_EXHDR(sstate));
result = makeNumericAggStateCurrentContext(false);
@@ -5222,7 +5221,6 @@ numeric_avg_deserialize(PG_FUNCTION_ARGS)
result->nInfcount = pq_getmsgint64(&buf);
pq_getmsgend(&buf);
- pfree(buf.data);
free_var(&tmp_var);
@@ -5306,12 +5304,11 @@ numeric_deserialize(PG_FUNCTION_ARGS)
init_var(&tmp_var);
/*
- * Copy the bytea into a StringInfo so that we can "receive" it using
the
- * standard recv-function infrastructure.
+ * Initialize a StringInfo so that we can "receive" it using the
standard
+ * recv-function infrastructure.
*/
- initStringInfo(&buf);
- appendBinaryStringInfo(&buf,
- VARDATA_ANY(sstate),
VARSIZE_ANY_EXHDR(sstate));
+ initReadOnlyStringInfo(&buf, VARDATA_ANY(sstate),
+ VARSIZE_ANY_EXHDR(sstate));
result = makeNumericAggStateCurrentContext(false);
@@ -5342,7 +5339,6 @@ numeric_deserialize(PG_FUNCTION_ARGS)
result->nInfcount = pq_getmsgint64(&buf);
pq_getmsgend(&buf);
- pfree(buf.data);
free_var(&tmp_var);
@@ -5677,12 +5673,11 @@ numeric_poly_deserialize(PG_FUNCTION_ARGS)
init_var(&tmp_var);
/*
- * Copy the bytea into a StringInfo so that we can "receive" it using
the
- * standard recv-function infrastructure.
+ * Initialize a StringInfo so that we can "receive" it using the
standard
+ * recv-function infrastructure.
*/
- initStringInfo(&buf);
- appendBinaryStringInfo(&buf,
- VARDATA_ANY(sstate),
VARSIZE_ANY_EXHDR(sstate));
+ initReadOnlyStringInfo(&buf, VARDATA_ANY(sstate),
+ VARSIZE_ANY_EXHDR(sstate));
result = makePolyNumAggStateCurrentContext(false);
@@ -5706,7 +5701,6 @@ numeric_poly_deserialize(PG_FUNCTION_ARGS)
#endif
pq_getmsgend(&buf);
- pfree(buf.data);
free_var(&tmp_var);
@@ -5868,12 +5862,11 @@ int8_avg_deserialize(PG_FUNCTION_ARGS)
init_var(&tmp_var);
/*
- * Copy the bytea into a StringInfo so that we can "receive" it using
the
- * standard recv-function infrastructure.
+ * Initialize a StringInfo so that we can "receive" it using the
standard
+ * recv-function infrastructure.
*/
- initStringInfo(&buf);
- appendBinaryStringInfo(&buf,
- VARDATA_ANY(sstate),
VARSIZE_ANY_EXHDR(sstate));
+ initReadOnlyStringInfo(&buf, VARDATA_ANY(sstate),
+ VARSIZE_ANY_EXHDR(sstate));
result = makePolyNumAggStateCurrentContext(false);
@@ -5889,7 +5882,6 @@ int8_avg_deserialize(PG_FUNCTION_ARGS)
#endif
pq_getmsgend(&buf);
- pfree(buf.data);
free_var(&tmp_var);
diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c
index 72e1e24fe0..ec4e580d7f 100644
--- a/src/backend/utils/adt/varlena.c
+++ b/src/backend/utils/adt/varlena.c
@@ -5289,12 +5289,11 @@ string_agg_deserialize(PG_FUNCTION_ARGS)
sstate = PG_GETARG_BYTEA_PP(0);
/*
- * Copy the bytea into a StringInfo so that we can "receive" it using
the
- * standard recv-function infrastructure.
+ * Initialize a StringInfo so that we can "receive" it using the
standard
+ * recv-function infrastructure.
*/
- initStringInfo(&buf);
- appendBinaryStringInfo(&buf,
- VARDATA_ANY(sstate),
VARSIZE_ANY_EXHDR(sstate));
+ initReadOnlyStringInfo(&buf, VARDATA_ANY(sstate),
+ VARSIZE_ANY_EXHDR(sstate));
result = makeStringAggState(fcinfo);
@@ -5307,7 +5306,6 @@ string_agg_deserialize(PG_FUNCTION_ARGS)
appendBinaryStringInfo(result, data, datalen);
pq_getmsgend(&buf);
- pfree(buf.data);
PG_RETURN_POINTER(result);
}
