Add support for the CASE statement in the rewrite handling.

Allows (at least some) rules and views.
Still some trouble (crashes) with target CASE columns spanning tables,
 but lots now works.

1 files changed, 49 insertions, 1 deletions

diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index c915ed6ed74..a6650efecf1 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.39 1998/11/22 10:48:40 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.40 1998/12/14 00:01:47 thomas Exp $
  *
  * NOTES
  *	  Most of the read functions for plan nodes are tested. (In fact, they
@@ -787,6 +787,50 @@ _readExpr()
 }
 
 /* ----------------
+ *		_readCaseExpr
+ *
+ *	CaseExpr is a subclass of Node
+ * ----------------
+ */
+static CaseExpr *
+_readCaseExpr()
+{
+	CaseExpr   *local_node;
+	char	   *token;
+	int			length;
+
+	local_node = makeNode(CaseExpr);
+
+	local_node->args = nodeRead(true);
+	token = lsptok(NULL, &length);		/* eat :default */
+	local_node->defresult = nodeRead(true);
+
+	return local_node;
+}
+
+/* ----------------
+ *		_readCaseWhen
+ *
+ *	CaseWhen is a subclass of Node
+ * ----------------
+ */
+static CaseWhen *
+_readCaseWhen()
+{
+	CaseWhen   *local_node;
+	char	   *token;
+	int			length;
+
+	local_node = makeNode(CaseWhen);
+
+	local_node->expr = nodeRead(true);
+	token = lsptok(NULL, &length);		/* eat :then */
+	local_node->result = nodeRead(true);
+
+	return local_node;
+}
+
+/* ----------------
  *		_readVar
  *
  *	Var is a subclass of Expr
@@ -2037,6 +2081,10 @@ parsePlanString(void)
 		return_value = _readSortClause();
 	else if (!strncmp(token, "GROUPCLAUSE", length))
 		return_value = _readGroupClause();
+	else if (!strncmp(token, "CASE", length))
+		return_value = _readCaseExpr();
+	else if (!strncmp(token, "WHEN", length))
+		return_value = _readCaseWhen();
 	else
 		elog(ERROR, "badly formatted planstring \"%.10s\"...\n", token);