Mop-up for Datum conversion cleanups.HEADorigin/masterorigin/HEADmaster

Fix a couple more places where an explicit Datum conversion
is needed (not clear how we missed these in ff89e182d and
previous commits).

Replace the minority usage "(Datum) NULL" with "(Datum) 0".
The former depends on the assumption that Datum is the same
width as Pointer, the latter doesn't.  Anyway consistency
is a good thing.

This is, I believe, the last of the notational mop-up needed
before we can consider changing Datum to uint64 everywhere.
It's also important cleanup for more aggressive ideas such
as making Datum a struct.

Discussion: https://postgr.es/m/1749799.1752797397@sss.pgh.pa.us
Discussion: https://postgr.es/m/8246d7ff-f4b7-4363-913e-827dadfeb145@eisentraut.org

12 files changed, 16 insertions, 16 deletions

diff --git a/src/backend/catalog/pg_aggregate.c b/src/backend/catalog/pg_aggregate.c
index a05f8a87c1f..c62e8acd413 100644
--- a/src/backend/catalog/pg_aggregate.c
+++ b/src/backend/catalog/pg_aggregate.c
@@ -654,7 +654,7 @@ AggregateCreate(const char *aggName,
 	for (i = 0; i < Natts_pg_aggregate; i++)
 	{
 		nulls[i] = false;
-		values[i] = (Datum) NULL;
+		values[i] = (Datum) 0;
 		replaces[i] = true;
 	}
 	values[Anum_pg_aggregate_aggfnoid - 1] = ObjectIdGetDatum(procOid);
diff --git a/src/backend/catalog/pg_constraint.c b/src/backend/catalog/pg_constraint.c
index 2d5ac1ea813..6002fd0002f 100644
--- a/src/backend/catalog/pg_constraint.c
+++ b/src/backend/catalog/pg_constraint.c
@@ -179,7 +179,7 @@ CreateConstraintEntry(const char *constraintName,
 	for (i = 0; i < Natts_pg_constraint; i++)
 	{
 		nulls[i] = false;
-		values[i] = (Datum) NULL;
+		values[i] = (Datum) 0;
 	}
 
 	conOid = GetNewOidWithIndex(conDesc, ConstraintOidIndexId,
diff --git a/src/backend/catalog/pg_conversion.c b/src/backend/catalog/pg_conversion.c
index 04cc375caea..090f680d190 100644
--- a/src/backend/catalog/pg_conversion.c
+++ b/src/backend/catalog/pg_conversion.c
@@ -87,7 +87,7 @@ ConversionCreate(const char *conname, Oid connamespace,
 	for (i = 0; i < Natts_pg_conversion; i++)
 	{
 		nulls[i] = false;
-		values[i] = (Datum) NULL;
+		values[i] = (Datum) 0;
 	}
 
 	/* form a tuple */
diff --git a/src/backend/catalog/pg_namespace.c b/src/backend/catalog/pg_namespace.c
index 6f5634a4de6..616bcc78521 100644
--- a/src/backend/catalog/pg_namespace.c
+++ b/src/backend/catalog/pg_namespace.c
@@ -76,7 +76,7 @@ NamespaceCreate(const char *nspName, Oid ownerId, bool isTemp)
 	for (i = 0; i < Natts_pg_namespace; i++)
 	{
 		nulls[i] = false;
-		values[i] = (Datum) NULL;
+		values[i] = (Datum) 0;
 	}
 
 	nspoid = GetNewOidWithIndex(nspdesc, NamespaceOidIndexId,
diff --git a/src/backend/catalog/pg_operator.c b/src/backend/catalog/pg_operator.c
index bfcfa643464..44d2ccb6788 100644
--- a/src/backend/catalog/pg_operator.c
+++ b/src/backend/catalog/pg_operator.c
@@ -225,7 +225,7 @@ OperatorShellMake(const char *operatorName,
 	for (i = 0; i < Natts_pg_operator; ++i)
 	{
 		nulls[i] = false;
-		values[i] = (Datum) NULL;	/* redundant, but safe */
+		values[i] = (Datum) 0;	/* redundant, but safe */
 	}
 
 	/*
@@ -453,7 +453,7 @@ OperatorCreate(const char *operatorName,
 
 	for (i = 0; i < Natts_pg_operator; ++i)
 	{
-		values[i] = (Datum) NULL;
+		values[i] = (Datum) 0;
 		replaces[i] = true;
 		nulls[i] = false;
 	}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index b36f81afb9d..1ec523ee3e5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -80,7 +80,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
 	for (i = 0; i < Natts_pg_type; ++i)
 	{
 		nulls[i] = false;
-		values[i] = (Datum) NULL;	/* redundant, but safe */
+		values[i] = (Datum) 0;	/* redundant, but safe */
 	}
 
 	/*
diff --git a/src/backend/executor/spi.c b/src/backend/executor/spi.c
index ecb2e4ccaa1..50fcd023776 100644
--- a/src/backend/executor/spi.c
+++ b/src/backend/executor/spi.c
@@ -1258,7 +1258,7 @@ SPI_getbinval(HeapTuple tuple, TupleDesc tupdesc, int fnumber, bool *isnull)
 	{
 		SPI_result = SPI_ERROR_NOATTRIBUTE;
 		*isnull = true;
-		return (Datum) NULL;
+		return (Datum) 0;
 	}
 
 	return heap_getattr(tuple, fnumber, tupdesc, isnull);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 48b5d13b9b6..2f933e95cb9 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -630,7 +630,7 @@ readDatum(bool typbyval)
 		}
 	}
 	else if (length <= 0)
-		res = (Datum) NULL;
+		res = (Datum) 0;
 	else
 	{
 		s = (char *) palloc(length);
diff --git a/src/backend/utils/adt/jsonfuncs.c b/src/backend/utils/adt/jsonfuncs.c
index 370456408bf..c5e1a027956 100644
--- a/src/backend/utils/adt/jsonfuncs.c
+++ b/src/backend/utils/adt/jsonfuncs.c
@@ -2027,7 +2027,7 @@ each_worker_jsonb(FunctionCallInfo fcinfo, const char *funcname, bool as_text)
 				{
 					/* a json null is an sql null in text mode */
 					nulls[1] = true;
-					values[1] = (Datum) NULL;
+					values[1] = (Datum) 0;
 				}
 				else
 					values[1] = PointerGetDatum(JsonbValueAsText(&v));
@@ -2266,7 +2266,7 @@ elements_worker_jsonb(FunctionCallInfo fcinfo, const char *funcname,
 				{
 					/* a json null is an sql null in text mode */
 					nulls[0] = true;
-					values[0] = (Datum) NULL;
+					values[0] = (Datum) 0;
 				}
 				else
 					values[0] = PointerGetDatum(JsonbValueAsText(&v));
@@ -2389,7 +2389,7 @@ elements_array_element_end(void *state, bool isnull)
 	if (isnull && _state->normalize_results)
 	{
 		nulls[0] = true;
-		values[0] = (Datum) NULL;
+		values[0] = (Datum) 0;
 	}
 	else if (_state->next_scalar)
 	{
diff --git a/src/backend/utils/adt/rangetypes.c b/src/backend/utils/adt/rangetypes.c
index 15398c72ea0..18e467bccd3 100644
--- a/src/backend/utils/adt/rangetypes.c
+++ b/src/backend/utils/adt/rangetypes.c
@@ -1343,9 +1343,9 @@ range_fast_cmp(Datum a, Datum b, SortSupport ssup)
 			cmp = range_cmp_bounds(typcache, &upper1, &upper2);
 	}
 
-	if ((Datum) range_a != a)
+	if ((Pointer) range_a != DatumGetPointer(a))
 		pfree(range_a);
-	if ((Datum) range_b != b)
+	if ((Pointer) range_b != DatumGetPointer(b))
 		pfree(range_b);
 
 	return cmp;
diff --git a/src/include/access/htup_details.h b/src/include/access/htup_details.h
index aa957cf3b01..ae813a79041 100644
--- a/src/include/access/htup_details.h
+++ b/src/include/access/htup_details.h
@@ -884,7 +884,7 @@ fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc, bool *isnull)
 		if (att_isnull(attnum - 1, tup->t_data->t_bits))
 		{
 			*isnull = true;
-			return (Datum) NULL;
+			return (Datum) 0;
 		}
 		else
 			return nocachegetattr(tup, attnum, tupleDesc);
diff --git a/src/include/access/itup.h b/src/include/access/itup.h
index 7066c2a2868..338e90749bd 100644
--- a/src/include/access/itup.h
+++ b/src/include/access/itup.h
@@ -154,7 +154,7 @@ index_getattr(IndexTuple tup, int attnum, TupleDesc tupleDesc, bool *isnull)
 		if (att_isnull(attnum - 1, (bits8 *) tup + sizeof(IndexTupleData)))
 		{
 			*isnull = true;
-			return (Datum) NULL;
+			return (Datum) 0;
 		}
 		else
 			return nocache_index_getattr(tup, attnum, tupleDesc);