Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my

recent proposal.  As proof of concept, remove knowledge of Params from the
core parser, arranging for them to be handled entirely by parser hook
functions.  It turns out we need an additional hook for that --- I had
forgotten about the code that handles inferring a parameter's type from
context.

This is a preliminary step towards letting plpgsql handle its variables
through parser hooks.  Additional work remains to be done to expose the
facility through SPI, but I think this is all the changes needed in the core
parser.

1 files changed, 24 insertions, 0 deletions

diff --git a/src/include/parser/parse_param.h b/src/include/parser/parse_param.h
new file mode 100644
index 00000000000..1423cde97c6
--- /dev/null
+++ b/src/include/parser/parse_param.h
@@ -0,0 +1,24 @@
+/*-------------------------------------------------------------------------
+ *
+ * parse_param.h
+ *	  handle parameters in parser
+ *
+ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * $PostgreSQL: pgsql/src/include/parser/parse_param.h,v 1.1 2009/10/31 01:41:31 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARSE_PARAM_H
+#define PARSE_PARAM_H
+
+#include "parser/parse_node.h"
+
+extern void parse_fixed_parameters(ParseState *pstate,
+								   Oid *paramTypes, int numParams);
+extern void parse_variable_parameters(ParseState *pstate,
+									  Oid **paramTypes, int *numParams);
+extern void check_variable_parameters(ParseState *pstate, Query *query);
+
+#endif   /* PARSE_PARAM_H */