New SubPlan node for subselects.

New PARAM_EXEC type.

src/include/nodes/execnodes.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: execnodes.h,v 1.12 1997/09/08 21:52:40 momjian Exp $
+ * $Id: execnodes.h,v 1.13 1998/02/13 03:45:22 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -80,16 +80,17 @@ typedef struct RelationInfo
  */
 typedef struct ExprContext
 {
-	NodeTag		type;
-	TupleTableSlot *ecxt_scantuple;
-	TupleTableSlot *ecxt_innertuple;
-	TupleTableSlot *ecxt_outertuple;
-	Relation	ecxt_relation;
-	Index		ecxt_relid;
-	ParamListInfo ecxt_param_list_info;
-	List	   *ecxt_range_table;
-	Datum	   *ecxt_values;	/* precomputed values for aggreg */
-	char	   *ecxt_nulls;		/* null flags for aggreg  values */
+	NodeTag				type;
+	TupleTableSlot	   *ecxt_scantuple;
+	TupleTableSlot	   *ecxt_innertuple;
+	TupleTableSlot	   *ecxt_outertuple;
+	Relation			ecxt_relation;
+	Index				ecxt_relid;
+	ParamListInfo		ecxt_param_list_info;
+	ParamExecData	   *ecxt_param_exec_vals;	/* this is for subselects */
+	List			   *ecxt_range_table;
+	Datum			   *ecxt_values;	/* precomputed values for aggreg */
+	char			   *ecxt_nulls;		/* null flags for aggreg  values */
 } ExprContext;
 
 /* ----------------
@@ -193,18 +194,19 @@ typedef struct JunkFilter
  */
 typedef struct EState
 {
-	NodeTag		type;
-	ScanDirection es_direction;
-	List	   *es_range_table;
-	RelationInfo *es_result_relation_info;
-	Relation	es_into_relation_descriptor;
-	ParamListInfo es_param_list_info;
-	int			es_BaseId;
-	TupleTable	es_tupleTable;
-	JunkFilter *es_junkFilter;
-	int		   *es_refcount;
-	uint32		es_processed;	/* # of tuples processed */
-	Oid			es_lastoid;		/* last oid processed (by INSERT) */
+	NodeTag				type;
+	ScanDirection		es_direction;
+	List			   *es_range_table;
+	RelationInfo	   *es_result_relation_info;
+	Relation			es_into_relation_descriptor;
+	ParamListInfo		es_param_list_info;
+	ParamExecData	   *es_param_exec_vals;	/* this is for subselects */
+	int					es_BaseId;
+	TupleTable			es_tupleTable;
+	JunkFilter		   *es_junkFilter;
+	int				   *es_refcount;
+	uint32				es_processed;	/* # of tuples processed */
+	Oid					es_lastoid;		/* last oid processed (by INSERT) */
 } EState;
 
 /* ----------------
@@ -292,7 +294,8 @@ typedef struct CommonState
 typedef struct ResultState
 {
 	CommonState cstate;			/* its first field is NodeTag */
-	int			rs_done;
+	bool		rs_done;
+	bool		rs_checkqual;
 } ResultState;
 
 /* ----------------

src/include/nodes/nodes.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: nodes.h,v 1.23 1998/01/17 04:53:38 momjian Exp $
+ * $Id: nodes.h,v 1.24 1998/02/13 03:45:23 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -47,6 +47,7 @@ typedef enum NodeTag
 	T_Choose,
 	T_Tee,
 	T_Group,
+	T_SubPlan,
 
 	/*---------------------
 	 * TAGS FOR PRIMITIVE NODES (primnodes.h)

src/include/nodes/params.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: params.h,v 1.6 1997/09/08 21:52:48 momjian Exp $
+ * $Id: params.h,v 1.7 1998/02/13 03:45:24 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -36,12 +36,16 @@
  *
  * PARAM_OLD:	Same as PARAM_NEW, but in this case we refer to
  *				the "OLD" tuple.
+ *
+ * PARAM_EXEC:	Evaluated by executor. Used for subselect...
+ *
  */
 
 #define PARAM_NAMED		11
 #define PARAM_NUM		12
 #define PARAM_NEW		13
 #define PARAM_OLD		14
+#define	PARAM_EXEC		15
 #define PARAM_INVALID	100
 
 
@@ -87,4 +91,11 @@ typedef struct ParamListInfoData
 
 typedef ParamListInfoData *ParamListInfo;
 
+typedef struct ParamExecData
+{
+	void	   *execPlan;		/* plan must be executed to get param value */
+	Datum		value;
+	bool		isnull;
+} ParamExecData;
+
 #endif							/* PARAMS_H */

src/include/nodes/plannodes.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: plannodes.h,v 1.13 1998/01/15 19:00:13 momjian Exp $
+ * $Id: plannodes.h,v 1.14 1998/02/13 03:45:25 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -74,6 +74,24 @@ typedef struct Plan
 	List	   *qual;			/* Node* or List* ?? */
 	struct Plan *lefttree;
 	struct Plan *righttree;
+	List	   *extParam;		/* indices of _all_ _external_ PARAM_EXEC for 
+								 * this plan in global es_param_exec_vals.
+								 * Params from setParam from initPlan-s
+								 * are not included, but their execParam-s 
+								 * are here!!! */
+	List	   *locParam;		/* someones from setParam-s */
+	List	   *chgParam;		/* list of changed ones from the above */
+	List	   *initPlan;		/* Init Plan nodes (un-correlated expr subselects) */
+	List	   *subPlan;		/* Other SubPlan nodes */
+	
+	/* 
+	 * We really need in some TopPlan node to store range table and
+	 * resultRelation from Query there and get rid of Query itself
+	 * from Executor. Some other stuff like below could be put there, too.
+	 */
+	int			nParamExec;		/* Number of them in entire query. This is
+								 * to get Executor know about how many
+								 * param_exec there are in query plan. */
 } Plan;
 
 /* ----------------
@@ -335,4 +353,24 @@ typedef struct Tee
 								 * plans */
 } Tee;
 
+/* ---------------------
+ *		SubPlan node
+ * ---------------------
+ */
+typedef struct SubPlan
+{
+	NodeTag			type;
+	Plan		   *plan;		/* subselect plan itself */
+	int				plan_id;	/* dummy thing because of we haven't
+								 * equal funcs for plan nodes... actually,
+								 * we could put *plan itself somewhere else
+								 * (TopPlan node ?)... */
+	List		   *rtable;		/* range table */
+	List		   *setParam;	/* non-correlated EXPR & EXISTS subqueries
+								 * have to set some Params for paren Plan */
+	List		   *parParam;	/* indices of corr. Vars from parent plan */
+	SubLink		   *sublink;	/* SubLink node for subselects in WHERE and HAVING */
+	bool			shutdown;	/* shutdown plan if TRUE */
+} SubPlan;
+
 #endif							/* PLANNODES_H */

src/include/nodes/primnodes.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: primnodes.h,v 1.18 1998/02/10 16:04:27 momjian Exp $
+ * $Id: primnodes.h,v 1.19 1998/02/13 03:45:29 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -86,7 +86,7 @@ typedef struct Fjoin
  */
 typedef enum OpType
 {
-	OP_EXPR, FUNC_EXPR, OR_EXPR, AND_EXPR, NOT_EXPR
+	OP_EXPR, FUNC_EXPR, OR_EXPR, AND_EXPR, NOT_EXPR, SUBPLAN_EXPR
 } OpType;
 
 typedef struct Expr
@@ -94,7 +94,7 @@ typedef struct Expr
 	NodeTag		type;
 	Oid			typeOid;		/* oid of the type of this expr */
 	OpType		opType;			/* type of the op */
-	Node	   *oper;			/* could be Oper or Func */
+	Node	   *oper;			/* could be Oper or Func or SubPlan */
 	List	   *args;			/* list of argument nodes */
 } Expr;