Thread

[PATCH v2 1/3] Don't cast away const where possible

Bertrand Drouvot <bertranddrouvot.pg@gmail.com> — 2025-12-18T09:51:01Z

Add const to read only local variables, preserving the const qualifiers from the
function signatures.

This does not change all such instances, but only those hand-picked by the author.

The ones that are not changed:

- are just thin wrappers
- would require public API changes
- rely on external functions (such as LZ4F_compressUpdate())
- would require complex subsystem changes

Discussion: https://postgr.es/m/aUQHy/MmWq7c97wK%40ip-10-97-1-34.eu-west-3.compute.internal
---
 src/backend/access/brin/brin_minmax_multi.c          | 4 ++--
 src/backend/access/heap/pruneheap.c                  | 4 ++--
 src/backend/access/spgist/spgkdtreeproc.c            | 8 ++++----
 src/backend/statistics/mcv.c                         | 4 ++--
 src/backend/tsearch/spell.c                          | 4 ++--
 src/test/modules/injection_points/injection_points.c | 8 ++++----
 6 files changed, 16 insertions(+), 16 deletions(-)
  10.2% src/backend/access/brin/
  12.5% src/backend/access/heap/
  18.7% src/backend/access/spgist/
   8.3% src/backend/statistics/
  11.6% src/backend/tsearch/
  38.4% src/test/modules/injection_points/

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 0298a9da8ba..0e87ce759f1 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1304,8 +1304,8 @@ merge_overlapping_ranges(FmgrInfo *cmp, Oid colloid,
 static int
 compare_distances(const void *a, const void *b)
 {
-	DistanceValue *da = (DistanceValue *) a;
-	DistanceValue *db = (DistanceValue *) b;
+	const DistanceValue *da = a;
+	const DistanceValue *db = b;
 
 	if (da->value < db->value)
 		return 1;
diff --git a/src/backend/access/heap/pruneheap.c b/src/backend/access/heap/pruneheap.c
index 07aa08cfe14..92aab1d6723 100644
--- a/src/backend/access/heap/pruneheap.c
+++ b/src/backend/access/heap/pruneheap.c
@@ -2021,8 +2021,8 @@ heap_log_freeze_eq(xlhp_freeze_plan *plan, HeapTupleFreeze *frz)
 static int
 heap_log_freeze_cmp(const void *arg1, const void *arg2)
 {
-	HeapTupleFreeze *frz1 = (HeapTupleFreeze *) arg1;
-	HeapTupleFreeze *frz2 = (HeapTupleFreeze *) arg2;
+	const HeapTupleFreeze *frz1 = arg1;
+	const HeapTupleFreeze *frz2 = arg2;
 
 	if (frz1->xmax < frz2->xmax)
 		return -1;
diff --git a/src/backend/access/spgist/spgkdtreeproc.c b/src/backend/access/spgist/spgkdtreeproc.c
index f0167d6ffa6..c02de835847 100644
--- a/src/backend/access/spgist/spgkdtreeproc.c
+++ b/src/backend/access/spgist/spgkdtreeproc.c
@@ -84,8 +84,8 @@ typedef struct SortedPoint
 static int
 x_cmp(const void *a, const void *b)
 {
-	SortedPoint *pa = (SortedPoint *) a;
-	SortedPoint *pb = (SortedPoint *) b;
+	const SortedPoint *pa = a;
+	const SortedPoint *pb = b;
 
 	if (pa->p->x == pb->p->x)
 		return 0;
@@ -95,8 +95,8 @@ x_cmp(const void *a, const void *b)
 static int
 y_cmp(const void *a, const void *b)
 {
-	SortedPoint *pa = (SortedPoint *) a;
-	SortedPoint *pb = (SortedPoint *) b;
+	const SortedPoint *pa = a;
+	const SortedPoint *pb = b;
 
 	if (pa->p->y == pb->p->y)
 		return 0;
diff --git a/src/backend/statistics/mcv.c b/src/backend/statistics/mcv.c
index ec650ba029f..dc577b9a1e4 100644
--- a/src/backend/statistics/mcv.c
+++ b/src/backend/statistics/mcv.c
@@ -402,8 +402,8 @@ count_distinct_groups(int numrows, SortItem *items, MultiSortSupport mss)
 static int
 compare_sort_item_count(const void *a, const void *b, void *arg)
 {
-	SortItem   *ia = (SortItem *) a;
-	SortItem   *ib = (SortItem *) b;
+	const SortItem *ia = a;
+	const SortItem *ib = b;
 
 	if (ia->count == ib->count)
 		return 0;
diff --git a/src/backend/tsearch/spell.c b/src/backend/tsearch/spell.c
index e5badb6b43f..3b0abfd9c35 100644
--- a/src/backend/tsearch/spell.c
+++ b/src/backend/tsearch/spell.c
@@ -210,8 +210,8 @@ cmpspellaffix(const void *s1, const void *s2)
 static int
 cmpcmdflag(const void *f1, const void *f2)
 {
-	CompoundAffixFlag *fv1 = (CompoundAffixFlag *) f1,
-			   *fv2 = (CompoundAffixFlag *) f2;
+	const CompoundAffixFlag *fv1 = f1;
+	const CompoundAffixFlag *fv2 = f2;
 
 	Assert(fv1->flagMode == fv2->flagMode);
 
diff --git a/src/test/modules/injection_points/injection_points.c b/src/test/modules/injection_points/injection_points.c
index 25340e8d81b..12ea81a030c 100644
--- a/src/test/modules/injection_points/injection_points.c
+++ b/src/test/modules/injection_points/injection_points.c
@@ -189,7 +189,7 @@ injection_init_shmem(void)
  * otherwise.
  */
 static bool
-injection_point_allowed(InjectionPointCondition *condition)
+injection_point_allowed(const InjectionPointCondition *condition)
 {
 	bool		result = true;
 
@@ -232,7 +232,7 @@ injection_points_cleanup(int code, Datum arg)
 void
 injection_error(const char *name, const void *private_data, void *arg)
 {
-	InjectionPointCondition *condition = (InjectionPointCondition *) private_data;
+	const InjectionPointCondition *condition = private_data;
 	char	   *argstr = (char *) arg;
 
 	if (!injection_point_allowed(condition))
@@ -248,7 +248,7 @@ injection_error(const char *name, const void *private_data, void *arg)
 void
 injection_notice(const char *name, const void *private_data, void *arg)
 {
-	InjectionPointCondition *condition = (InjectionPointCondition *) private_data;
+	const InjectionPointCondition *condition = private_data;
 	char	   *argstr = (char *) arg;
 
 	if (!injection_point_allowed(condition))
@@ -268,7 +268,7 @@ injection_wait(const char *name, const void *private_data, void *arg)
 	uint32		old_wait_counts = 0;
 	int			index = -1;
 	uint32		injection_wait_event = 0;
-	InjectionPointCondition *condition = (InjectionPointCondition *) private_data;
+	const InjectionPointCondition *condition = private_data;
 
 	if (inj_state == NULL)
 		injection_init_shmem();
-- 
2.34.1


--IBFQ0J+7bhRCocF6
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
	filename="v2-0002-Add-const-to-read-only-TableInfo-pointers-in-pg_d.patch"