Change LIMIT/OFFSET to use int8

Dhanaraj M

src/backend/executor/nodeLimit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/executor/nodeLimit.c,v 1.25 2006/03/05 15:58:26 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/executor/nodeLimit.c,v 1.26 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -23,6 +23,7 @@
 
 #include "executor/executor.h"
 #include "executor/nodeLimit.h"
+#include "catalog/pg_type.h"
 
 static void recompute_limits(LimitState *node);
 
@@ -226,14 +227,24 @@ recompute_limits(LimitState *node)
 {
 	ExprContext *econtext = node->ps.ps_ExprContext;
 	bool		isNull;
-
+  	Oid type;
+  
 	if (node->limitOffset)
 	{
-		node->offset =
-			DatumGetInt32(ExecEvalExprSwitchContext(node->limitOffset,
+		type = ((Const *) node->limitOffset->expr)->consttype;
+  
+		if (type == INT8OID)
+			node->offset =
+			DatumGetInt64(ExecEvalExprSwitchContext(node->limitOffset,
 													econtext,
 													&isNull,
 													NULL));
+		else
+			node->offset = DatumGetInt32(ExecEvalExprSwitchContext(node->limitOffset,
+																   econtext,
+																   &isNull,
+																   NULL));
+
 		/* Interpret NULL offset as no offset */
 		if (isNull)
 			node->offset = 0;
@@ -249,11 +260,21 @@ recompute_limits(LimitState *node)
 	if (node->limitCount)
 	{
 		node->noCount = false;
-		node->count =
-			DatumGetInt32(ExecEvalExprSwitchContext(node->limitCount,
+		type = ((Const *) node->limitCount->expr)->consttype;
+ 
+		if (type == INT8OID)
+			node->count =
+			DatumGetInt64(ExecEvalExprSwitchContext(node->limitCount,
 													econtext,
 													&isNull,
 													NULL));
+		else
+			node->count = DatumGetInt32(ExecEvalExprSwitchContext(node->limitCount,
+																  econtext,
+																  &isNull,
+																  NULL));
+ 
+
 		/* Interpret NULL count as no count (LIMIT ALL) */
 		if (isNull)
 			node->noCount = true;

src/backend/optimizer/plan/createplan.c

@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.214 2006/07/14 14:52:20 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.215 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2863,7 +2863,7 @@ make_setop(SetOpCmd cmd, Plan *lefttree,
  */
 Limit *
 make_limit(Plan *lefttree, Node *limitOffset, Node *limitCount,
-		   int offset_est, int count_est)
+		   int64 offset_est, int64 count_est)
 {
 	Limit	   *node = makeNode(Limit);
 	Plan	   *plan = &node->plan;

src/backend/optimizer/plan/planner.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.203 2006/07/14 14:52:20 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.204 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -59,7 +59,7 @@ static Plan *inheritance_planner(PlannerInfo *root);
 static Plan *grouping_planner(PlannerInfo *root, double tuple_fraction);
 static double preprocess_limit(PlannerInfo *root,
 				 double tuple_fraction,
-				 int *offset_est, int *count_est);
+				 int64 *offset_est, int64 *count_est);
 static bool choose_hashed_grouping(PlannerInfo *root, double tuple_fraction,
 					   Path *cheapest_path, Path *sorted_path,
 					   double dNumGroups, AggClauseCounts *agg_counts);
@@ -631,8 +631,8 @@ grouping_planner(PlannerInfo *root, double tuple_fraction)
 {
 	Query	   *parse = root->parse;
 	List	   *tlist = parse->targetList;
-	int			offset_est = 0;
-	int			count_est = 0;
+	int64		offset_est = 0;
+	int64		count_est = 0;
 	Plan	   *result_plan;
 	List	   *current_pathkeys;
 	List	   *sort_pathkeys;
@@ -1080,7 +1080,7 @@ grouping_planner(PlannerInfo *root, double tuple_fraction)
  */
 static double
 preprocess_limit(PlannerInfo *root, double tuple_fraction,
-				 int *offset_est, int *count_est)
+				 int64 *offset_est, int64 *count_est)
 {
 	Query	   *parse = root->parse;
 	Node	   *est;
@@ -1105,7 +1105,7 @@ preprocess_limit(PlannerInfo *root, double tuple_fraction,
 			}
 			else
 			{
-				*count_est = DatumGetInt32(((Const *) est)->constvalue);
+				*count_est = DatumGetInt64(((Const *) est)->constvalue);
 				if (*count_est <= 0)
 					*count_est = 1;		/* force to at least 1 */
 			}
@@ -1128,7 +1128,8 @@ preprocess_limit(PlannerInfo *root, double tuple_fraction,
 			}
 			else
 			{
-				*offset_est = DatumGetInt32(((Const *) est)->constvalue);
+				*offset_est = DatumGetInt64(((Const *) est)->constvalue);
+
 				if (*offset_est < 0)
 					*offset_est = 0;	/* less than 0 is same as 0 */
 			}

src/backend/parser/parse_clause.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.153 2006/07/14 14:52:21 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.154 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1090,7 +1090,7 @@ transformLimitClause(ParseState *pstate, Node *clause,
 
 	qual = transformExpr(pstate, clause);
 
-	qual = coerce_to_integer(pstate, qual, constructName);
+	qual = coerce_to_integer64(pstate, qual, constructName);
 
 	/*
 	 * LIMIT can't refer to any vars or aggregates of the current query; we

src/backend/parser/parse_coerce.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.141 2006/07/14 14:52:22 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.142 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -821,7 +821,7 @@ coerce_to_boolean(ParseState *pstate, Node *node,
 
 /* coerce_to_integer()
  *		Coerce an argument of a construct that requires integer input
- *		(LIMIT, OFFSET, etc).  Also check that input is not a set.
+ *		Also check that input is not a set.
  *
  * Returns the possibly-transformed node tree.
  *
@@ -857,7 +857,45 @@ coerce_to_integer(ParseState *pstate, Node *node,
 
 	return node;
 }
+ 
+/* coerce_to_integer64()
+ *              Coerce an argument of a construct that requires integer input
+ *              (LIMIT, OFFSET).  Also check that input is not a set.
+ *
+ * Returns the possibly-transformed node tree.
+ *
+ * As with coerce_type, pstate may be NULL if no special unknown-Param
+ * processing is wanted.
+ */
+Node *
+coerce_to_integer64(ParseState *pstate, Node *node,
+					const char *constructName)
+{
+	Oid	inputTypeId = exprType(node);
+
+	if (inputTypeId != INT8OID)
+	{
+		node = coerce_to_target_type(pstate, node, inputTypeId,
+									 INT8OID, -1, COERCION_ASSIGNMENT,
+									 COERCE_IMPLICIT_CAST);
+		if (node == NULL)
+				ereport(ERROR,
+						  (errcode(ERRCODE_DATATYPE_MISMATCH),
+					  /* translator: first %s is name of a SQL construct, eg LIMIT */
+							 errmsg("argument of %s must be type integer, not type %s",
+									constructName, format_type_be(inputTypeId))));
+	}
 
+	if (expression_returns_set(node))
+		ereport(ERROR,
+				  (errcode(ERRCODE_DATATYPE_MISMATCH),
+		  /* translator: %s is name of a SQL construct, eg LIMIT */
+					   errmsg("argument of %s must not return a set",
+							  constructName)));
+
+	return node;
+}
+  
 
 /* select_common_type()
  *		Determine the common supertype of a list of input expression types.

src/include/nodes/execnodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.153 2006/07/13 16:49:19 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.154 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1325,11 +1325,11 @@ typedef struct LimitState
 	PlanState	ps;				/* its first field is NodeTag */
 	ExprState  *limitOffset;	/* OFFSET parameter, or NULL if none */
 	ExprState  *limitCount;		/* COUNT parameter, or NULL if none */
-	long		offset;			/* current OFFSET value */
-	long		count;			/* current COUNT, if any */
+	int64		offset;			/* current OFFSET value */
+	int64		count;			/* current COUNT, if any */
 	bool		noCount;		/* if true, ignore count */
 	LimitStateCond lstate;		/* state machine status, as above */
-	long		position;		/* 1-based index of last tuple returned */
+	int64		position;		/* 1-based index of last tuple returned */
 	TupleTableSlot *subSlot;	/* tuple last obtained from subplan */
 } LimitState;
 

src/include/optimizer/planmain.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.93 2006/07/01 18:38:33 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.94 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -55,7 +55,7 @@ extern Material *make_material(Plan *lefttree);
 extern Plan *materialize_finished_plan(Plan *subplan);
 extern Unique *make_unique(Plan *lefttree, List *distinctList);
 extern Limit *make_limit(Plan *lefttree, Node *limitOffset, Node *limitCount,
-		   int offset_est, int count_est);
+		   int64 offset_est, int64 count_est);
 extern SetOp *make_setop(SetOpCmd cmd, Plan *lefttree,
 		   List *distinctList, AttrNumber flagColIdx);
 extern Result *make_result(List *tlist, Node *resconstantqual, Plan *subplan);

src/include/parser/parse_coerce.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/parser/parse_coerce.h,v 1.63 2006/07/13 16:49:19 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/parser/parse_coerce.h,v 1.64 2006/07/26 00:34:48 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -57,7 +57,9 @@ extern Node *coerce_to_boolean(ParseState *pstate, Node *node,
 				  const char *constructName);
 extern Node *coerce_to_integer(ParseState *pstate, Node *node,
 				  const char *constructName);
-
+extern Node *coerce_to_integer64(ParseState *pstate, Node *node,
+                                    const char *constructName);
+ 
 extern Oid	select_common_type(List *typeids, const char *context);
 extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
 					  Oid targetTypeId,