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Commitc0f92b5

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committed
Allow extracting and parsing of reloptions from a bare pg_class tuple, and
refactor the relcache code that used to do that. This allows other callers(particularly autovacuum) to do the same without necessarily having to openand lock a table.
1 parent39ab3c1 commitc0f92b5

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3 files changed

+57
-30
lines changed

3 files changed

+57
-30
lines changed

‎src/backend/access/common/reloptions.c‎

Lines changed: 48 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/common/reloptions.c,v 1.18 2009/01/12 21:02:14 alvherre Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/common/reloptions.c,v 1.19 2009/01/26 19:41:06 alvherre Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -558,6 +558,53 @@ untransformRelOptions(Datum options)
558558
returnresult;
559559
}
560560

561+
/*
562+
* Extract and parse reloptions from a pg_class tuple.
563+
*
564+
* This is a low-level routine, expected to be used by relcache code and
565+
* callers that do not have a table's relcache entry (e.g. autovacuum). For
566+
* other uses, consider grabbing the rd_options pointer from the relcache entry
567+
* instead.
568+
*
569+
* tupdesc is pg_class' tuple descriptor. amoptions is the amoptions regproc
570+
* in the case of the tuple corresponding to an index, or InvalidOid otherwise.
571+
*/
572+
bytea*
573+
extractRelOptions(HeapTupletuple,TupleDesctupdesc,Oidamoptions)
574+
{
575+
bytea*options;
576+
boolisnull;
577+
Datumdatum;
578+
Form_pg_classclassForm;
579+
580+
datum=fastgetattr(tuple,
581+
Anum_pg_class_reloptions,
582+
tupdesc,
583+
&isnull);
584+
if (isnull)
585+
returnNULL;
586+
587+
classForm= (Form_pg_class)GETSTRUCT(tuple);
588+
589+
/* Parse into appropriate format; don't error out here */
590+
switch (classForm->relkind)
591+
{
592+
caseRELKIND_RELATION:
593+
caseRELKIND_TOASTVALUE:
594+
caseRELKIND_UNCATALOGED:
595+
options=heap_reloptions(classForm->relkind,datum, false);
596+
break;
597+
caseRELKIND_INDEX:
598+
options=index_reloptions(amoptions,datum, false);
599+
break;
600+
default:
601+
Assert(false);/* can't get here */
602+
options=NULL;/* keep compiler quiet */
603+
break;
604+
}
605+
606+
returnoptions;
607+
}
561608

562609
/*
563610
* Interpret reloptions that are given in text-array format.

‎src/backend/utils/cache/relcache.c‎

Lines changed: 5 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.282 2009/01/22 20:16:06tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.283 2009/01/26 19:41:06alvherre Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -351,8 +351,6 @@ AllocateRelationDesc(Relation relation, Form_pg_class relp)
351351
staticvoid
352352
RelationParseRelOptions(Relationrelation,HeapTupletuple)
353353
{
354-
Datumdatum;
355-
boolisnull;
356354
bytea*options;
357355

358356
relation->rd_options=NULL;
@@ -374,31 +372,10 @@ RelationParseRelOptions(Relation relation, HeapTuple tuple)
374372
* we might not have any other for pg_class yet (consider executing this
375373
* code for pg_class itself)
376374
*/
377-
datum=fastgetattr(tuple,
378-
Anum_pg_class_reloptions,
379-
GetPgClassDescriptor(),
380-
&isnull);
381-
if (isnull)
382-
return;
383-
384-
/* Parse into appropriate format; don't error out here */
385-
switch (relation->rd_rel->relkind)
386-
{
387-
caseRELKIND_RELATION:
388-
caseRELKIND_TOASTVALUE:
389-
caseRELKIND_UNCATALOGED:
390-
options=heap_reloptions(relation->rd_rel->relkind,datum,
391-
false);
392-
break;
393-
caseRELKIND_INDEX:
394-
options=index_reloptions(relation->rd_am->amoptions,datum,
395-
false);
396-
break;
397-
default:
398-
Assert(false);/* can't get here */
399-
options=NULL;/* keep compiler quiet */
400-
break;
401-
}
375+
options=extractRelOptions(tuple,
376+
GetPgClassDescriptor(),
377+
relation->rd_rel->relkind==RELKIND_INDEX ?
378+
relation->rd_am->amoptions :InvalidOid);
402379

403380
/* Copy parsed data into CacheMemoryContext */
404381
if (options)

‎src/include/access/reloptions.h‎

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -11,13 +11,14 @@
1111
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
1212
* Portions Copyright (c) 1994, Regents of the University of California
1313
*
14-
* $PostgreSQL: pgsql/src/include/access/reloptions.h,v 1.10 2009/01/12 21:02:15 alvherre Exp $
14+
* $PostgreSQL: pgsql/src/include/access/reloptions.h,v 1.11 2009/01/26 19:41:06 alvherre Exp $
1515
*
1616
*-------------------------------------------------------------------------
1717
*/
1818
#ifndefRELOPTIONS_H
1919
#defineRELOPTIONS_H
2020

21+
#include"access/htup.h"
2122
#include"nodes/pg_list.h"
2223

2324
/* types supported by reloptions */
@@ -241,6 +242,8 @@ extern void add_string_reloption(int kind, char *name, char *desc,
241242
externDatumtransformRelOptions(DatumoldOptions,List*defList,
242243
boolignoreOids,boolisReset);
243244
externList*untransformRelOptions(Datumoptions);
245+
externbytea*extractRelOptions(HeapTupletuple,TupleDesctupdesc,
246+
Oidamoptions);
244247
externrelopt_value*parseRelOptions(Datumoptions,boolvalidate,
245248
relopt_kindkind,int*numrelopts);
246249
externvoid*allocateReloptStruct(Sizebase,relopt_value*options,

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