pg_class.relhaspkey doesn't seem to be used or useful for anything, so
can we remove it? See attached patch.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
From 01004383b0a3d30d519b9dc219b54c8d753df8ee Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <pete...@gmx.net>
Date: Sat, 24 Feb 2018 21:25:08 -0500
Subject: [PATCH] Remove pg_class.relhaspkey
It's not used for anything internally, and it can't be relied on for
external uses, so it can just be removed.
---
doc/src/sgml/catalogs.sgml | 9 ---------
src/backend/catalog/heap.c | 1 -
src/backend/catalog/index.c | 32 ++-----------------------------
src/backend/commands/vacuum.c | 10 ----------
src/backend/rewrite/rewriteDefine.c | 1 -
src/include/catalog/pg_class.h | 38 ++++++++++++++++++-------------------
6 files changed, 20 insertions(+), 71 deletions(-)
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index 71e20f2740..b93eef4efc 100644
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -1848,15 +1848,6 @@ <title><structname>pg_class</structname> Columns</title>
</entry>
</row>
- <row>
- <entry><structfield>relhaspkey</structfield></entry>
- <entry><type>bool</type></entry>
- <entry></entry>
- <entry>
- True if the table has (or once had) a primary key
- </entry>
- </row>
-
<row>
<entry><structfield>relhasrules</structfield></entry>
<entry><type>bool</type></entry>
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index cf36ce4add..3d80ff9e5b 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -798,7 +798,6 @@ InsertPgClassTuple(Relation pg_class_desc,
values[Anum_pg_class_relnatts - 1] = Int16GetDatum(rd_rel->relnatts);
values[Anum_pg_class_relchecks - 1] = Int16GetDatum(rd_rel->relchecks);
values[Anum_pg_class_relhasoids - 1] = BoolGetDatum(rd_rel->relhasoids);
- values[Anum_pg_class_relhaspkey - 1] = BoolGetDatum(rd_rel->relhaspkey);
values[Anum_pg_class_relhasrules - 1] =
BoolGetDatum(rd_rel->relhasrules);
values[Anum_pg_class_relhastriggers - 1] =
BoolGetDatum(rd_rel->relhastriggers);
values[Anum_pg_class_relrowsecurity - 1] =
BoolGetDatum(rd_rel->relrowsecurity);
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 564f2069cf..6268c10e11 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -125,7 +125,7 @@ static void UpdateIndexRelation(Oid indexoid, Oid heapoid,
bool isvalid,
bool isready);
static void index_update_stats(Relation rel,
- bool hasindex, bool isprimary,
+ bool hasindex,
double reltuples);
static void IndexCheckExclusion(Relation heapRelation,
Relation indexRelation,
@@ -1162,7 +1162,6 @@ index_create(Relation heapRelation,
*/
index_update_stats(heapRelation,
true,
- isprimary,
-1.0);
/* Make the above update visible */
CommandCounterIncrement();
@@ -1364,21 +1363,6 @@ index_constraint_create(Relation heapRelation,
InvalidOid, conOid,
indexRelationId, true);
}
- /*
- * If needed, mark the table as having a primary key. We assume it
can't
- * have been so marked already, so no need to clear the flag in the
other
- * case.
- *
- * Note: this might better be done by callers. We do it here to avoid
- * exposing index_update_stats() globally, but that wouldn't be
necessary
- * if relhaspkey went away.
- */
- if (mark_as_primary)
- index_update_stats(heapRelation,
- true,
- true,
- -1.0);
-
/*
* If needed, mark the index as primary and/or deferred in pg_index.
*
@@ -2041,7 +2025,6 @@ FormIndexDatum(IndexInfo *indexInfo,
* to ensure we can do all the necessary work in just one update.
*
* hasindex: set relhasindex to this value
- * isprimary: if true, set relhaspkey true; else no change
* reltuples: if >= 0, set reltuples to this value; else no change
*
* If reltuples >= 0, relpages and relallvisible are also updated (using
@@ -2058,7 +2041,6 @@ FormIndexDatum(IndexInfo *indexInfo,
static void
index_update_stats(Relation rel,
bool hasindex,
- bool isprimary,
double reltuples)
{
Oid relid = RelationGetRelid(rel);
@@ -2088,7 +2070,7 @@ index_update_stats(Relation rel,
* It is safe to use a non-transactional update even though our
* transaction could still fail before committing. Setting relhasindex
* true is safe even if there are no indexes (VACUUM will eventually fix
- * it), likewise for relhaspkey. And of course the new relpages and
+ * it). And of course the new relpages and
* reltuples counts are correct regardless. However, we don't want to
* change relpages (or relallvisible) if the caller isn't providing an
* updated reltuples count, because that would bollix the
@@ -2140,14 +2122,6 @@ index_update_stats(Relation rel,
rd_rel->relhasindex = hasindex;
dirty = true;
}
- if (isprimary)
- {
- if (!rd_rel->relhaspkey)
- {
- rd_rel->relhaspkey = true;
- dirty = true;
- }
- }
if (reltuples >= 0)
{
@@ -2356,11 +2330,9 @@ index_build(Relation heapRelation,
*/
index_update_stats(heapRelation,
true,
- isprimary,
stats->heap_tuples);
index_update_stats(indexRelation,
- false,
false,
stats->index_tuples);
diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c
index 7aca69a0ba..1fad073192 100644
--- a/src/backend/commands/vacuum.c
+++ b/src/backend/commands/vacuum.c
@@ -929,16 +929,6 @@ vac_update_relstats(Relation relation,
dirty = true;
}
- /*
- * If we have discovered that there are no indexes, then
there's no
- * primary key either. This could be done more thoroughly...
- */
- if (pgcform->relhaspkey && !hasindex)
- {
- pgcform->relhaspkey = false;
- dirty = true;
- }
-
/* We also clear relhasrules and relhastriggers if needed */
if (pgcform->relhasrules && relation->rd_rules == NULL)
{
diff --git a/src/backend/rewrite/rewriteDefine.c
b/src/backend/rewrite/rewriteDefine.c
index f3a9b639a8..679be605f1 100644
--- a/src/backend/rewrite/rewriteDefine.c
+++ b/src/backend/rewrite/rewriteDefine.c
@@ -618,7 +618,6 @@ DefineQueryRewrite(const char *rulename,
classForm->relhasindex = false;
classForm->relkind = RELKIND_VIEW;
classForm->relhasoids = false;
- classForm->relhaspkey = false;
classForm->relfrozenxid = InvalidTransactionId;
classForm->relminmxid = InvalidMultiXactId;
classForm->relreplident = REPLICA_IDENTITY_NOTHING;
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 26b1866c69..97026bfc2e 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -61,7 +61,6 @@ CATALOG(pg_class,1259) BKI_BOOTSTRAP BKI_ROWTYPE_OID(83)
BKI_SCHEMA_MACRO
*/
int16 relchecks; /* # of CHECK constraints for
class */
bool relhasoids; /* T if we generate OIDs for
rows of rel */
- bool relhaspkey; /* has (or has had) PRIMARY KEY
index */
bool relhasrules; /* has (or has had) any rules */
bool relhastriggers; /* has (or has had) any TRIGGERs */
bool relhassubclass; /* has (or has had) derived classes */
@@ -99,7 +98,7 @@ typedef FormData_pg_class *Form_pg_class;
* ----------------
*/
-#define Natts_pg_class 33
+#define Natts_pg_class 32
#define Anum_pg_class_relname 1
#define Anum_pg_class_relnamespace 2
#define Anum_pg_class_reltype 3
@@ -119,20 +118,19 @@ typedef FormData_pg_class *Form_pg_class;
#define Anum_pg_class_relnatts 17
#define Anum_pg_class_relchecks 18
#define Anum_pg_class_relhasoids 19
-#define Anum_pg_class_relhaspkey 20
-#define Anum_pg_class_relhasrules 21
-#define Anum_pg_class_relhastriggers 22
-#define Anum_pg_class_relhassubclass 23
-#define Anum_pg_class_relrowsecurity 24
-#define Anum_pg_class_relforcerowsecurity 25
-#define Anum_pg_class_relispopulated 26
-#define Anum_pg_class_relreplident 27
-#define Anum_pg_class_relispartition 28
-#define Anum_pg_class_relfrozenxid 29
-#define Anum_pg_class_relminmxid 30
-#define Anum_pg_class_relacl 31
-#define Anum_pg_class_reloptions 32
-#define Anum_pg_class_relpartbound 33
+#define Anum_pg_class_relhasrules 20
+#define Anum_pg_class_relhastriggers 21
+#define Anum_pg_class_relhassubclass 22
+#define Anum_pg_class_relrowsecurity 23
+#define Anum_pg_class_relforcerowsecurity 24
+#define Anum_pg_class_relispopulated 25
+#define Anum_pg_class_relreplident 26
+#define Anum_pg_class_relispartition 27
+#define Anum_pg_class_relfrozenxid 28
+#define Anum_pg_class_relminmxid 29
+#define Anum_pg_class_relacl 30
+#define Anum_pg_class_reloptions 31
+#define Anum_pg_class_relpartbound 32
/* ----------------
* initial contents of pg_class
@@ -147,13 +145,13 @@ typedef FormData_pg_class *Form_pg_class;
* Note: "3" in the relfrozenxid column stands for FirstNormalTransactionId;
* similarly, "1" in relminmxid stands for FirstMultiXactId
*/
-DATA(insert OID = 1247 ( pg_type PGNSP 71 0 PGUID 0 0 0 0 0 0 0
f f p r 30 0 t f f f f f f t n f 3 1 _null_ _null_ _null_));
+DATA(insert OID = 1247 ( pg_type PGNSP 71 0 PGUID 0 0 0 0 0 0 0
f f p r 30 0 t f f f f f t n f 3 1 _null_ _null_ _null_));
DESCR("");
-DATA(insert OID = 1249 ( pg_attribute PGNSP 75 0 PGUID 0 0 0 0 0 0 0 f f p r
22 0 f f f f f f f t n f 3 1 _null_ _null_ _null_));
+DATA(insert OID = 1249 ( pg_attribute PGNSP 75 0 PGUID 0 0 0 0 0 0 0 f f p r
22 0 f f f f f f t n f 3 1 _null_ _null_ _null_));
DESCR("");
-DATA(insert OID = 1255 ( pg_proc PGNSP 81 0 PGUID 0 0 0 0 0 0 0
f f p r 29 0 t f f f f f f t n f 3 1 _null_ _null_ _null_));
+DATA(insert OID = 1255 ( pg_proc PGNSP 81 0 PGUID 0 0 0 0 0 0 0
f f p r 29 0 t f f f f f t n f 3 1 _null_ _null_ _null_));
DESCR("");
-DATA(insert OID = 1259 ( pg_class PGNSP 83 0 PGUID 0 0 0 0 0 0 0
f f p r 33 0 t f f f f f f t n f 3 1 _null_ _null_ _null_));
+DATA(insert OID = 1259 ( pg_class PGNSP 83 0 PGUID 0 0 0 0 0 0 0
f f p r 32 0 t f f f f f t n f 3 1 _null_ _null_ _null_));
DESCR("");
--
2.16.2
