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db_include/access/tupconvert.h

@@ -0,0 +1,51 @@
+/*-------------------------------------------------------------------------
+ *
+ * tupconvert.h
+ *	  Tuple conversion support.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/tupconvert.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef TUPCONVERT_H
+#define TUPCONVERT_H
+
+#include "access/attmap.h"
+#include "access/htup.h"
+#include "access/tupdesc.h"
+#include "executor/tuptable.h"
+#include "nodes/bitmapset.h"
+
+
+typedef struct TupleConversionMap
+{
+	TupleDesc	indesc;			/* tupdesc for source rowtype */
+	TupleDesc	outdesc;		/* tupdesc for result rowtype */
+	AttrMap    *attrMap;		/* indexes of input fields, or 0 for null */
+	Datum	   *invalues;		/* workspace for deconstructing source */
+	bool	   *inisnull;
+	Datum	   *outvalues;		/* workspace for constructing result */
+	bool	   *outisnull;
+} TupleConversionMap;
+
+
+extern TupleConversionMap *convert_tuples_by_position(TupleDesc indesc,
+													  TupleDesc outdesc,
+													  const char *msg);
+
+extern TupleConversionMap *convert_tuples_by_name(TupleDesc indesc,
+												  TupleDesc outdesc);
+
+extern HeapTuple execute_attr_map_tuple(HeapTuple tuple, TupleConversionMap *map);
+extern TupleTableSlot *execute_attr_map_slot(AttrMap *attrMap,
+											 TupleTableSlot *in_slot,
+											 TupleTableSlot *out_slot);
+extern Bitmapset *execute_attr_map_cols(AttrMap *attrMap, Bitmapset *inbitmap);
+
+extern void free_conversion_map(TupleConversionMap *map);
+
+#endif							/* TUPCONVERT_H */