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Remove pg_attribute.attcacheoff column
The column is no longer needed as the offset is now cached in the CompactAttribute struct per commit 5983a4c. Author: David Rowley Reviewed-by: Andres Freund, Victor Yegorov Discussion: https://postgr.es/m/CAApHDvrBztXP3yx=NKNmo3xwFAFhEdyPnvrDg3=M0RhDs+4vYw@mail.gmail.com
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10 files changed

+9
-71
lines changed

10 files changed

+9
-71
lines changed

‎doc/src/sgml/catalogs.sgml

Lines changed: 0 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -1186,17 +1186,6 @@
11861186
</para></entry>
11871187
</row>
11881188

1189-
<row>
1190-
<entry role="catalog_table_entry"><para role="column_definition">
1191-
<structfield>attcacheoff</structfield> <type>int4</type>
1192-
</para>
1193-
<para>
1194-
Always -1 in storage, but when loaded into a row descriptor
1195-
in memory this might be updated to cache the offset of the attribute
1196-
within the row
1197-
</para></entry>
1198-
</row>
1199-
12001189
<row>
12011190
<entry role="catalog_table_entry"><para role="column_definition">
12021191
<structfield>atttypmod</structfield> <type>int4</type>

‎src/backend/access/common/tupdesc.c

Lines changed: 2 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -388,17 +388,7 @@ TupleDescCopyEntry(TupleDesc dst, AttrNumber dstAttno,
388388

389389
memcpy(dstAtt, srcAtt, ATTRIBUTE_FIXED_PART_SIZE);
390390

391-
/*
392-
* Aside from updating the attno, we'd better reset attcacheoff.
393-
*
394-
* XXX Actually, to be entirely safe we'd need to reset the attcacheoff of
395-
* all following columns in dst as well. Current usage scenarios don't
396-
* require that though, because all following columns will get initialized
397-
* by other uses of this function or TupleDescInitEntry. So we cheat a
398-
* bit to avoid a useless O(N^2) penalty.
399-
*/
400391
dstAtt->attnum = dstAttno;
401-
dstAtt->attcacheoff = -1;
402392

403393
/* since we're not copying constraints or defaults, clear these */
404394
dstAtt->attnotnull = false;
@@ -528,9 +518,8 @@ equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2)
528518
* them (since atttypid will be zero for all dropped columns) and in
529519
* general it seems safer to check them always.
530520
*
531-
* attcacheoff must NOT be checked since it's possibly not set in both
532-
* copies. We also intentionally ignore atthasmissing, since that's
533-
* not very relevant in tupdescs, which lack the attmissingval field.
521+
* We intentionally ignore atthasmissing, since that's not very
522+
* relevant in tupdescs, which lack the attmissingval field.
534523
*/
535524
if (strcmp(NameStr(attr1->attname), NameStr(attr2->attname)) != 0)
536525
return false;
@@ -771,7 +760,6 @@ TupleDescInitEntry(TupleDesc desc,
771760
else if (attributeName != NameStr(att->attname))
772761
namestrcpy(&(att->attname), attributeName);
773762

774-
att->attcacheoff = -1;
775763
att->atttypmod = typmod;
776764

777765
att->attnum = attributeNumber;
@@ -835,7 +823,6 @@ TupleDescInitBuiltinEntry(TupleDesc desc,
835823
Assert(attributeName != NULL);
836824
namestrcpy(&(att->attname), attributeName);
837825

838-
att->attcacheoff = -1;
839826
att->atttypmod = typmod;
840827

841828
att->attnum = attributeNumber;

‎src/backend/bootstrap/bootstrap.c

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -580,7 +580,6 @@ DefineAttr(char *name, char *type, int attnum, int nullness)
580580
if (OidIsValid(attrtypes[attnum]->attcollation))
581581
attrtypes[attnum]->attcollation = C_COLLATION_OID;
582582

583-
attrtypes[attnum]->attcacheoff = -1;
584583
attrtypes[attnum]->atttypmod = -1;
585584
attrtypes[attnum]->attislocal = true;
586585

‎src/backend/catalog/heap.c

Lines changed: 4 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -144,7 +144,6 @@ static const FormData_pg_attribute a1 = {
144144
.atttypid = TIDOID,
145145
.attlen = sizeof(ItemPointerData),
146146
.attnum = SelfItemPointerAttributeNumber,
147-
.attcacheoff = -1,
148147
.atttypmod = -1,
149148
.attbyval = false,
150149
.attalign = TYPALIGN_SHORT,
@@ -158,7 +157,6 @@ static const FormData_pg_attribute a2 = {
158157
.atttypid = XIDOID,
159158
.attlen = sizeof(TransactionId),
160159
.attnum = MinTransactionIdAttributeNumber,
161-
.attcacheoff = -1,
162160
.atttypmod = -1,
163161
.attbyval = true,
164162
.attalign = TYPALIGN_INT,
@@ -172,7 +170,6 @@ static const FormData_pg_attribute a3 = {
172170
.atttypid = CIDOID,
173171
.attlen = sizeof(CommandId),
174172
.attnum = MinCommandIdAttributeNumber,
175-
.attcacheoff = -1,
176173
.atttypmod = -1,
177174
.attbyval = true,
178175
.attalign = TYPALIGN_INT,
@@ -186,7 +183,6 @@ static const FormData_pg_attribute a4 = {
186183
.atttypid = XIDOID,
187184
.attlen = sizeof(TransactionId),
188185
.attnum = MaxTransactionIdAttributeNumber,
189-
.attcacheoff = -1,
190186
.atttypmod = -1,
191187
.attbyval = true,
192188
.attalign = TYPALIGN_INT,
@@ -200,7 +196,6 @@ static const FormData_pg_attribute a5 = {
200196
.atttypid = CIDOID,
201197
.attlen = sizeof(CommandId),
202198
.attnum = MaxCommandIdAttributeNumber,
203-
.attcacheoff = -1,
204199
.atttypmod = -1,
205200
.attbyval = true,
206201
.attalign = TYPALIGN_INT,
@@ -220,7 +215,6 @@ static const FormData_pg_attribute a6 = {
220215
.atttypid = OIDOID,
221216
.attlen = sizeof(Oid),
222217
.attnum = TableOidAttributeNumber,
223-
.attcacheoff = -1,
224218
.atttypmod = -1,
225219
.attbyval = true,
226220
.attalign = TYPALIGN_INT,
@@ -684,11 +678,10 @@ CheckAttributeType(const char *attname,
684678
* Construct and insert a set of tuples in pg_attribute.
685679
*
686680
* Caller has already opened and locked pg_attribute. tupdesc contains the
687-
* attributes to insert. attcacheoff is always initialized to -1.
688-
* tupdesc_extra supplies the values for certain variable-length/nullable
689-
* pg_attribute fields and must contain the same number of elements as tupdesc
690-
* or be NULL. The other variable-length fields of pg_attribute are always
691-
* initialized to null values.
681+
* attributes to insert. tupdesc_extra supplies the values for certain
682+
* variable-length/nullable pg_attribute fields and must contain the same
683+
* number of elements as tupdesc or be NULL. The other variable-length fields
684+
* of pg_attribute are always initialized to null values.
692685
*
693686
* indstate is the index state for CatalogTupleInsertWithInfo. It can be
694687
* passed as NULL, in which case we'll fetch the necessary info. (Don't do
@@ -740,7 +733,6 @@ InsertPgAttributeTuples(Relation pg_attribute_rel,
740733
slot[slotCount]->tts_values[Anum_pg_attribute_atttypid - 1] = ObjectIdGetDatum(attrs->atttypid);
741734
slot[slotCount]->tts_values[Anum_pg_attribute_attlen - 1] = Int16GetDatum(attrs->attlen);
742735
slot[slotCount]->tts_values[Anum_pg_attribute_attnum - 1] = Int16GetDatum(attrs->attnum);
743-
slot[slotCount]->tts_values[Anum_pg_attribute_attcacheoff - 1] = Int32GetDatum(-1);
744736
slot[slotCount]->tts_values[Anum_pg_attribute_atttypmod - 1] = Int32GetDatum(attrs->atttypmod);
745737
slot[slotCount]->tts_values[Anum_pg_attribute_attndims - 1] = Int16GetDatum(attrs->attndims);
746738
slot[slotCount]->tts_values[Anum_pg_attribute_attbyval - 1] = BoolGetDatum(attrs->attbyval);

‎src/backend/catalog/index.c

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -320,7 +320,6 @@ ConstructTupleDescriptor(Relation heapRelation,
320320

321321
MemSet(to, 0, ATTRIBUTE_FIXED_PART_SIZE);
322322
to->attnum = i + 1;
323-
to->attcacheoff = -1;
324323
to->attislocal = true;
325324
to->attcollation = (i < numkeyatts) ? collationIds[i] : InvalidOid;
326325

‎src/backend/utils/cache/relcache.c

Lines changed: 0 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -661,19 +661,6 @@ RelationBuildTupleDesc(Relation relation)
661661
elog(ERROR, "pg_attribute catalog is missing %d attribute(s) for relation OID %u",
662662
need, RelationGetRelid(relation));
663663

664-
/*
665-
* The attcacheoff values we read from pg_attribute should all be -1
666-
* ("unknown"). Verify this if assert checking is on.
667-
*/
668-
#ifdef USE_ASSERT_CHECKING
669-
{
670-
int i;
671-
672-
for (i = 0; i < RelationGetNumberOfAttributes(relation); i++)
673-
Assert(TupleDescAttr(relation->rd_att, i)->attcacheoff == -1);
674-
}
675-
#endif
676-
677664
/*
678665
* We can easily set the attcacheoff value for the first attribute: it
679666
* must be zero. This eliminates the need for special cases for attnum=1
@@ -1964,8 +1951,6 @@ formrdesc(const char *relationName, Oid relationReltype,
19641951
&attrs[i],
19651952
ATTRIBUTE_FIXED_PART_SIZE);
19661953
has_not_null |= attrs[i].attnotnull;
1967-
/* make sure attcacheoff is valid */
1968-
TupleDescAttr(relation->rd_att, i)->attcacheoff = -1;
19691954

19701955
populate_compact_attribute(relation->rd_att, i);
19711956
}
@@ -4401,8 +4386,6 @@ BuildHardcodedDescriptor(int natts, const FormData_pg_attribute *attrs)
44014386
for (i = 0; i < natts; i++)
44024387
{
44034388
memcpy(TupleDescAttr(result, i), &attrs[i], ATTRIBUTE_FIXED_PART_SIZE);
4404-
/* make sure attcacheoff is valid */
4405-
TupleDescAttr(result, i)->attcacheoff = -1;
44064389

44074390
populate_compact_attribute(result, i);
44084391
}

‎src/include/catalog/catversion.h

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -57,6 +57,6 @@
5757
*/
5858

5959
/* yyyymmddN */
60-
#define CATALOG_VERSION_NO 202412191
60+
#define CATALOG_VERSION_NO 202412201
6161

6262
#endif

‎src/include/catalog/pg_attribute.h

Lines changed: 0 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -73,15 +73,6 @@ CATALOG(pg_attribute,1249,AttributeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(75,
7373
*/
7474
int16 attnum;
7575

76-
/*
77-
* fastgetattr() uses attcacheoff to cache byte offsets of attributes in
78-
* heap tuples. The value actually stored in pg_attribute (-1) indicates
79-
* no cached value. But when we copy these tuples into a tuple
80-
* descriptor, we may then update attcacheoff in the copies. This speeds
81-
* up the attribute walking process.
82-
*/
83-
int32 attcacheoff BKI_DEFAULT(-1);
84-
8576
/*
8677
* atttypmod records type-specific data supplied at table creation time
8778
* (for example, the max length of a varchar field). It is passed to

‎src/test/regress/expected/type_sanity.out

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -550,8 +550,7 @@ WHERE pc.relkind IN ('r', 't', 'm') and
550550
SELECT a1.attrelid, a1.attname
551551
FROM pg_attribute as a1
552552
WHERE a1.attrelid = 0 OR a1.atttypid = 0 OR a1.attnum = 0 OR
553-
a1.attcacheoff != -1 OR a1.attinhcount < 0 OR
554-
(a1.attinhcount = 0 AND NOT a1.attislocal);
553+
a1.attinhcount < 0 OR (a1.attinhcount = 0 AND NOT a1.attislocal);
555554
attrelid | attname
556555
----------+---------
557556
(0 rows)

‎src/test/regress/sql/type_sanity.sql

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -397,8 +397,7 @@ WHERE pc.relkind IN ('r', 't', 'm') and
397397
SELECT a1.attrelid, a1.attname
398398
FROM pg_attribute as a1
399399
WHERE a1.attrelid = 0 OR a1.atttypid = 0 OR a1.attnum = 0 OR
400-
a1.attcacheoff != -1 OR a1.attinhcount < 0 OR
401-
(a1.attinhcount = 0 AND NOT a1.attislocal);
400+
a1.attinhcount < 0 OR (a1.attinhcount = 0 AND NOT a1.attislocal);
402401

403402
-- Cross-check attnum against parent relation
404403

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