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Remove pg_class.relhaspkey

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It is not used for anything internally, and it cannot be relied on for
external uses, so it can just be removed.  To correct recommended way to
check for a primary key is in pg_index.

Discussion: https://www.postgresql.org/message-id/flat/b1a24c6c-6913-f89c-674e-0704f0ed69db@2ndquadrant.com
pull/31/merge
Peter Eisentraut 8 years ago
parent 6b960aae90
commit f66e8bf875
7 changed files with 21 additions and 72 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 9
      doc/src/sgml/catalogs.sgml
  2. 1
      src/backend/catalog/heap.c
  3. 32
      src/backend/catalog/index.c
  4. 10
      src/backend/commands/vacuum.c
  5. 1
      src/backend/rewrite/rewriteDefine.c
  6. 2
      src/include/catalog/catversion.h
  7. 38
      src/include/catalog/pg_class.h

9
doc/src/sgml/catalogs.sgml
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@ -1848,15 +1848,6 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</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>

1
src/backend/catalog/heap.c
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@ -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);

32
src/backend/catalog/index.c
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@ -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);

10
src/backend/commands/vacuum.c
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@ -909,16 +909,6 @@ 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)
{

1
src/backend/rewrite/rewriteDefine.c
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@ -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;

2
src/include/catalog/catversion.h
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@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201803021
#define CATALOG_VERSION_NO 201803141
#endif

38
src/include/catalog/pg_class.h
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@ -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 28 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 28 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("");

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