Set pg_am.amstrategies to zero for index AMs that don't have fixed

operator strategy numbers, ie, GiST and GIN.  This is almost cosmetic
enough to not need a catversion bump, but since the opr_sanity regression
test has to change in sync with the catalog entry, I figured I'd better
do one.

doc/src/sgml/catalogs.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.137 2006/11/12 06:25:37 neilc Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.138 2006/12/18 18:56:28 tgl Exp $ -->
 <!--
  Documentation of the system catalogs, directed toward PostgreSQL developers
  -->
@@ -347,7 +347,9 @@
       <entry><structfield>amstrategies</structfield></entry>
       <entry><type>int2</type></entry>
       <entry></entry>
-      <entry>Number of operator strategies for this access method</entry>
+      <entry>Number of operator strategies for this access method,
+       or zero if access method does not have a fixed set of operator
+       strategies</entry>
      </row>
 
      <row>

src/backend/commands/opclasscmds.c

@@ -9,12 +9,14 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/opclasscmds.c,v 1.49 2006/10/04 00:29:51 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/opclasscmds.c,v 1.50 2006/12/18 18:56:28 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
 #include "postgres.h"
 
+#include <limits.h>
+
 #include "access/genam.h"
 #include "access/heapam.h"
 #include "catalog/dependency.h"
@@ -73,8 +75,8 @@ DefineOpClass(CreateOpClassStmt *stmt)
 				storageoid,		/* storage datatype oid, if any */
 				namespaceoid,	/* namespace to create opclass in */
 				opclassoid;		/* oid of opclass we create */
-	int			numOperators,	/* amstrategies value */
-				numProcs;		/* amsupport value */
+	int			maxOpNumber,	/* amstrategies value */
+				maxProcNumber;	/* amsupport value */
 	bool		amstorage;		/* amstorage flag */
 	List	   *operators;		/* OpClassMember list for operators */
 	List	   *procedures;		/* OpClassMember list for support procs */
@@ -112,8 +114,11 @@ DefineOpClass(CreateOpClassStmt *stmt)
 
 	amoid = HeapTupleGetOid(tup);
 	pg_am = (Form_pg_am) GETSTRUCT(tup);
-	numOperators = pg_am->amstrategies;
-	numProcs = pg_am->amsupport;
+	maxOpNumber = pg_am->amstrategies;
+	/* if amstrategies is zero, just enforce that op numbers fit in int16 */
+	if (maxOpNumber <= 0)
+		maxOpNumber = SHRT_MAX;
+	maxProcNumber = pg_am->amsupport;
 	amstorage = pg_am->amstorage;
 
 	/* XXX Should we make any privilege check against the AM? */
@@ -176,12 +181,12 @@ DefineOpClass(CreateOpClassStmt *stmt)
 		switch (item->itemtype)
 		{
 			case OPCLASS_ITEM_OPERATOR:
-				if (item->number <= 0 || item->number > numOperators)
+				if (item->number <= 0 || item->number > maxOpNumber)
 					ereport(ERROR,
 							(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 							 errmsg("invalid operator number %d,"
 									" must be between 1 and %d",
-									item->number, numOperators)));
+									item->number, maxOpNumber)));
 				if (item->args != NIL)
 				{
 					TypeName   *typeName1 = (TypeName *) linitial(item->args);
@@ -220,12 +225,12 @@ DefineOpClass(CreateOpClassStmt *stmt)
 				addClassMember(&operators, member, false);
 				break;
 			case OPCLASS_ITEM_FUNCTION:
-				if (item->number <= 0 || item->number > numProcs)
+				if (item->number <= 0 || item->number > maxProcNumber)
 					ereport(ERROR,
 							(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 							 errmsg("invalid procedure number %d,"
 									" must be between 1 and %d",
-									item->number, numProcs)));
+									item->number, maxProcNumber)));
 				funcOid = LookupFuncNameTypeNames(item->name, item->args,
 												  false);
 #ifdef NOT_USED

src/backend/optimizer/util/plancat.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/optimizer/util/plancat.c,v 1.127 2006/10/04 00:29:55 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/optimizer/util/plancat.c,v 1.128 2006/12/18 18:56:28 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -190,10 +190,17 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 			 * Fetch the ordering operators associated with the index, if any.
 			 */
 			amorderstrategy = indexRelation->rd_am->amorderstrategy;
-			if (amorderstrategy != 0)
+			if (amorderstrategy > 0)
 			{
 				int			oprindex = amorderstrategy - 1;
 
+				/*
+				 * Index AM must have a fixed set of strategies for it to
+				 * make sense to specify amorderstrategy, so we need not
+				 * allow the case amstrategies == 0.
+				 */
+				Assert(oprindex < indexRelation->rd_am->amstrategies);
+
 				for (i = 0; i < ncolumns; i++)
 				{
 					info->ordering[i] = indexRelation->rd_operator[oprindex];

src/include/catalog/catversion.h

@@ -37,7 +37,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.362 2006/12/10 22:13:26 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.363 2006/12/18 18:56:28 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	200612101
+#define CATALOG_VERSION_NO	200612181
 
 #endif

src/include/catalog/pg_am.h

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/pg_am.h,v 1.46 2006/07/31 20:09:05 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/pg_am.h,v 1.47 2006/12/18 18:56:29 tgl Exp $
  *
  * NOTES
  *		the genbki.sh script reads this file and generates .bki
@@ -40,7 +40,9 @@ CATALOG(pg_am,2601)
 {
 	NameData	amname;			/* access method name */
 	int2		amstrategies;	/* total NUMBER of strategies (operators) by
-								 * which we can traverse/search this AM */
+								 * which we can traverse/search this AM.
+								 * Zero if AM does not have a fixed set of
+								 * strategy assignments. */
 	int2		amsupport;		/* total NUMBER of support functions that this
 								 * AM uses */
 	int2		amorderstrategy;/* if this AM has a sort order, the strategy
@@ -114,10 +116,10 @@ DESCR("b-tree index access method");
 DATA(insert OID = 405 (  hash	1 1 0 f f f f f f hashinsert hashbeginscan hashgettuple hashgetmulti hashrescan hashendscan hashmarkpos hashrestrpos hashbuild hashbulkdelete hashvacuumcleanup hashcostestimate hashoptions ));
 DESCR("hash index access method");
 #define HASH_AM_OID 405
-DATA(insert OID = 783 (  gist	100 7 0 f t t t t t gistinsert gistbeginscan gistgettuple gistgetmulti gistrescan gistendscan gistmarkpos gistrestrpos gistbuild gistbulkdelete gistvacuumcleanup gistcostestimate gistoptions ));
+DATA(insert OID = 783 (  gist	0 7 0 f t t t t t gistinsert gistbeginscan gistgettuple gistgetmulti gistrescan gistendscan gistmarkpos gistrestrpos gistbuild gistbulkdelete gistvacuumcleanup gistcostestimate gistoptions ));
 DESCR("GiST index access method");
 #define GIST_AM_OID 783
-DATA(insert OID = 2742 (  gin	100 4 0 f f f f t f gininsert ginbeginscan gingettuple gingetmulti ginrescan ginendscan ginmarkpos ginrestrpos ginbuild ginbulkdelete ginvacuumcleanup gincostestimate ginoptions ));
+DATA(insert OID = 2742 (  gin	0 4 0 f f f f t f gininsert ginbeginscan gingettuple gingetmulti ginrescan ginendscan ginmarkpos ginrestrpos ginbuild ginbulkdelete ginvacuumcleanup gincostestimate ginoptions ));
 DESCR("GIN index access method");
 #define GIN_AM_OID 2742
 

src/test/regress/expected/opr_sanity.out

@@ -773,7 +773,7 @@ WHERE p1.amopclaid = 0 OR p1.amopstrategy <= 0 OR p1.amopopr = 0;
 SELECT p1.amopclaid, p1.amopopr, p2.oid, p2.amname
 FROM pg_amop AS p1, pg_am AS p2, pg_opclass AS p3
 WHERE p1.amopclaid = p3.oid AND p3.opcamid = p2.oid AND
-    p1.amopstrategy > p2.amstrategies;
+    p1.amopstrategy > p2.amstrategies AND p2.amstrategies <> 0;
  amopclaid | amopopr | oid | amname 
 -----------+---------+-----+--------
 (0 rows)
@@ -781,12 +781,11 @@ WHERE p1.amopclaid = p3.oid AND p3.opcamid = p2.oid AND
 -- Detect missing pg_amop entries: should have as many strategy operators
 -- as AM expects for each opclass for the AM.  When nondefault subtypes are
 -- present, enforce condition separately for each subtype.
--- We have to exclude GiST and GIN, unfortunately, since they haven't got
--- any fixed requirements about strategy operators.
+-- We can't check this for AMs with variable strategy sets.
 SELECT p1.oid, p1.amname, p2.oid, p2.opcname, p3.amopsubtype
 FROM pg_am AS p1, pg_opclass AS p2, pg_amop AS p3
 WHERE p2.opcamid = p1.oid AND p3.amopclaid = p2.oid AND
-    p1.amname != 'gist' AND p1.amname != 'gin' AND
+    p1.amstrategies <> 0 AND
     p1.amstrategies != (SELECT count(*) FROM pg_amop AS p4
                         WHERE p4.amopclaid = p2.oid AND
                               p4.amopsubtype = p3.amopsubtype);

src/test/regress/sql/opr_sanity.sql

@@ -642,18 +642,17 @@ WHERE p1.amopclaid = 0 OR p1.amopstrategy <= 0 OR p1.amopopr = 0;
 SELECT p1.amopclaid, p1.amopopr, p2.oid, p2.amname
 FROM pg_amop AS p1, pg_am AS p2, pg_opclass AS p3
 WHERE p1.amopclaid = p3.oid AND p3.opcamid = p2.oid AND
-    p1.amopstrategy > p2.amstrategies;
+    p1.amopstrategy > p2.amstrategies AND p2.amstrategies <> 0;
 
 -- Detect missing pg_amop entries: should have as many strategy operators
 -- as AM expects for each opclass for the AM.  When nondefault subtypes are
 -- present, enforce condition separately for each subtype.
--- We have to exclude GiST and GIN, unfortunately, since they haven't got
--- any fixed requirements about strategy operators.
+-- We can't check this for AMs with variable strategy sets.
 
 SELECT p1.oid, p1.amname, p2.oid, p2.opcname, p3.amopsubtype
 FROM pg_am AS p1, pg_opclass AS p2, pg_amop AS p3
 WHERE p2.opcamid = p1.oid AND p3.amopclaid = p2.oid AND
-    p1.amname != 'gist' AND p1.amname != 'gin' AND
+    p1.amstrategies <> 0 AND
     p1.amstrategies != (SELECT count(*) FROM pg_amop AS p4
                         WHERE p4.amopclaid = p2.oid AND
                               p4.amopsubtype = p3.amopsubtype);