Creates the SubLink structure, and the Query->hasSubLink field,

with supporting code.

Creates SubLink node in gram.y.

psql.c patch for newatttypmod field.

src/backend/nodes/copyfuncs.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.31 1998/01/16 23:19:56 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.32 1998/01/17 04:53:07 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -892,6 +892,28 @@ _copyAggreg(Aggreg *from)
 	return newnode;
 }
 
+/* ----------------
+ *		_copySubLink
+ * ----------------
+ */
+static SubLink *
+_copySubLink(SubLink *from)
+{
+	SubLink	   *newnode = makeNode(SubLink);
+
+	/* ----------------
+	 *	copy remainder of node
+	 * ----------------
+	 */
+	newnode->subLinkType = from->subLinkType;
+	newnode->useor = from->useor;
+	Node_Copy(from, newnode, lefthand);
+	Node_Copy(from, newnode, oper);
+	Node_Copy(from, newnode, subselect);
+
+	return newnode;
+}
+
 static Array *
 _copyArray(Array *from)
 {
@@ -1517,6 +1539,7 @@ _copyQuery(Query *from)
 	Node_Copy(from, newnode, havingQual);
 
 	newnode->hasAggs = from->hasAggs;
+	newnode->hasSubLinks = from->hasSubLinks;
 
 	if (from->unionClause)
 	{
@@ -1673,6 +1696,9 @@ copyObject(void *from)
 		case T_Aggreg:
 			retval = _copyAggreg(from);
 			break;
+		case T_SubLink:
+			retval = _copySubLink(from);
+			break;
 
 			/*
 			 * RELATION NODES

src/backend/nodes/outfuncs.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.22 1998/01/16 23:19:59 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.23 1998/01/17 04:53:09 momjian Exp $
  *
  * NOTES
  *	  Every (plan) node in POSTGRES has an associated "out" routine which
@@ -230,6 +230,8 @@ _outQuery(StringInfo str, Query *node)
  	_outNode(str, node->havingQual);
 	appendStringInfo(str, " :hasAggs ");
 	appendStringInfo(str, (node->hasAggs ? "true" : "false"));
+	appendStringInfo(str, " :hasSubLinks ");
+	appendStringInfo(str, (node->hasSubLinks ? "true" : "false"));
 	appendStringInfo(str, " :unionClause ");
  	_outNode(str, node->unionClause);
 }
@@ -753,6 +755,27 @@ _outAggreg(StringInfo str, Aggreg *node)
 	appendStringInfo(str, node->usenulls ? "true" : "false");
 }
 
+/*
+ *	SubLink
+ */
+static void
+_outSubLink(StringInfo str, SubLink *node)
+{
+	char		buf[500];
+
+	appendStringInfo(str, "SUBLINK");
+	sprintf(buf, " :subLinkType %d ", node->subLinkType);
+	appendStringInfo(str, buf);
+	appendStringInfo(str, " :useor ");
+	appendStringInfo(str, node->useor ? "true" : "false");
+	appendStringInfo(str, " :lefthand ");
+	_outNode(str, node->lefthand);
+	appendStringInfo(str, " :oper ");
+	_outNode(str, node->oper);
+	appendStringInfo(str, " :subselect ");
+	_outNode(str, node->subselect);
+}
+
 /*
  *	Array is a subclass of Expr
  */
@@ -1648,6 +1671,9 @@ _outNode(StringInfo str, void *obj)
 			case T_Aggreg:
 				_outAggreg(str, obj);
 				break;
+			case T_SubLink:
+				_outSubLink(str, obj);
+				break;
 			case T_Array:
 				_outArray(str, obj);
 				break;

src/backend/nodes/readfuncs.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.18 1998/01/15 18:59:31 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.19 1998/01/17 04:53:11 momjian Exp $
  *
  * NOTES
  *	  Most of the read functions for plan nodes are tested. (In fact, they
@@ -156,6 +156,10 @@ _readQuery()
 	token = lsptok(NULL, &length);		/* get hasAggs */
 	local_node->hasAggs = (token[0] == 't') ? true : false;
 
+	token = lsptok(NULL, &length);		/* skip the :hasSubLinks */
+	token = lsptok(NULL, &length);		/* get hasSubLinks */
+	local_node->hasSubLinks = (token[0] == 't') ? true : false;
+
 	token = lsptok(NULL, &length);		/* skip :unionClause */
 	local_node->unionClause = nodeRead(true);
 
@@ -1151,6 +1155,41 @@ _readAggreg()
 	return (local_node);
 }
 
+/* ----------------
+ *		_readSubLink
+ *
+ *	SubLink is a subclass of Node
+ * ----------------
+ */
+static SubLink *
+_readSubLink()
+{
+	SubLink	   *local_node;
+	char	   *token;
+	int			length;
+
+	local_node = makeNode(SubLink);
+
+	token = lsptok(NULL, &length);		/* eat :subLinkType */
+	token = lsptok(NULL, &length);		/* get subLinkType */
+	local_node->subLinkType = atoi(token);
+
+	token = lsptok(NULL, &length);		/* eat :useor */
+	token = lsptok(NULL, &length);		/* get useor */
+	local_node->useor = (token[0] == 't') ? true : false;
+
+	token = lsptok(NULL, &length);		/* eat :lefthand */
+	local_node->lefthand = nodeRead(true);		/* now read it */
+
+	token = lsptok(NULL, &length);		/* eat :oper */
+	local_node->oper = nodeRead(true);		/* now read it */
+
+	token = lsptok(NULL, &length);		/* eat :subselect */
+	local_node->subselect = nodeRead(true);		/* now read it */
+
+	return (local_node);
+}
+
 /*
  *	Stuff from execnodes.h
  */
@@ -1971,6 +2010,10 @@ parsePlanString(void)
 	{
 		return_value = _readAggreg();
 	}
+	else if (!strncmp(token, "SUBLINK", 6))
+	{
+		return_value = _readSubLink();
+	}
 	else if (!strncmp(token, "AGG", 3))
 	{
 		return_value = _readAgg();