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pg_include/parser/parse_oper.h

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+/*-------------------------------------------------------------------------
+ *
+ * parse_oper.h
+ *		handle operator things for parser
+ *
+ *
+ * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/parser/parse_oper.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARSE_OPER_H
+#define PARSE_OPER_H
+
+#include "access/htup.h"
+#include "parser/parse_node.h"
+
+
+typedef HeapTuple Operator;
+
+/* Routines to look up an operator given name and exact input type(s) */
+extern Oid LookupOperName(ParseState *pstate, List *opername,
+			   Oid oprleft, Oid oprright,
+			   bool noError, int location);
+extern Oid LookupOperNameTypeNames(ParseState *pstate, List *opername,
+						TypeName *oprleft, TypeName *oprright,
+						bool noError, int location);
+
+/* Routines to find operators matching a name and given input types */
+/* NB: the selected operator may require coercion of the input types! */
+extern Operator oper(ParseState *pstate, List *op, Oid arg1, Oid arg2,
+	 bool noError, int location);
+extern Operator right_oper(ParseState *pstate, List *op, Oid arg,
+		   bool noError, int location);
+extern Operator left_oper(ParseState *pstate, List *op, Oid arg,
+		  bool noError, int location);
+
+/* Routines to find operators that DO NOT require coercion --- ie, their */
+/* input types are either exactly as given, or binary-compatible */
+extern Operator compatible_oper(ParseState *pstate, List *op,
+				Oid arg1, Oid arg2,
+				bool noError, int location);
+
+/* currently no need for compatible_left_oper/compatible_right_oper */
+
+/* Routines for identifying "<", "=", ">" operators for a type */
+extern void get_sort_group_operators(Oid argtype,
+						 bool needLT, bool needEQ, bool needGT,
+						 Oid *ltOpr, Oid *eqOpr, Oid *gtOpr,
+						 bool *isHashable);
+
+/* Convenience routines for common calls on the above */
+extern Oid	compatible_oper_opid(List *op, Oid arg1, Oid arg2, bool noError);
+
+/* Extract operator OID or underlying-function OID from an Operator tuple */
+extern Oid	oprid(Operator op);
+extern Oid	oprfuncid(Operator op);
+
+/* Build expression tree for an operator invocation */
+extern Expr *make_op(ParseState *pstate, List *opname,
+		Node *ltree, Node *rtree, int location);
+extern Expr *make_scalar_array_op(ParseState *pstate, List *opname,
+					 bool useOr,
+					 Node *ltree, Node *rtree, int location);
+
+#endif   /* PARSE_OPER_H */