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db_include/parser/parsetree.h

@@ -0,0 +1,61 @@
+/*-------------------------------------------------------------------------
+ *
+ * parsetree.h
+ *	  Routines to access various components and subcomponents of
+ *	  parse trees.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/parser/parsetree.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARSETREE_H
+#define PARSETREE_H
+
+#include "nodes/parsenodes.h"
+
+
+/* ----------------
+ *		range table operations
+ * ----------------
+ */
+
+/*
+ *		rt_fetch
+ *
+ * NB: this will crash and burn if handed an out-of-range RT index
+ */
+#define rt_fetch(rangetable_index, rangetable) \
+	((RangeTblEntry *) list_nth(rangetable, (rangetable_index)-1))
+
+/*
+ * Given an RTE and an attribute number, return the appropriate
+ * variable name or alias for that attribute of that RTE.
+ */
+extern char *get_rte_attribute_name(RangeTblEntry *rte, AttrNumber attnum);
+
+/*
+ * Check whether an attribute of an RTE has been dropped
+ */
+extern bool get_rte_attribute_is_dropped(RangeTblEntry *rte,
+										 AttrNumber attnum);
+
+
+/* ----------------
+ *		target list operations
+ * ----------------
+ */
+
+extern TargetEntry *get_tle_by_resno(List *tlist, AttrNumber resno);
+
+/* ----------------
+ *		FOR UPDATE/SHARE info
+ * ----------------
+ */
+
+extern RowMarkClause *get_parse_rowmark(Query *qry, Index rtindex);
+
+#endif							/* PARSETREE_H */