1 files changed, 55 insertions, 0 deletions
diff --git a/src/include/nodes/tidbitmap.h b/src/include/nodes/tidbitmap.h
new file mode 100644
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+++ b/src/include/nodes/tidbitmap.h
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+/*-------------------------------------------------------------------------
+ *
+ * tidbitmap.h
+ *	  PostgreSQL tuple-id (TID) bitmap package
+ *
+ * This module provides bitmap data structures that are spiritually
+ * similar to Bitmapsets, but are specially adapted to store sets of
+ * tuple identifiers (TIDs), or ItemPointers.  In particular, the division
+ * of an ItemPointer into BlockNumber and OffsetNumber is catered for.
+ * Also, since we wish to be able to store very large tuple sets in
+ * memory with this data structure, we support "lossy" storage, in which
+ * we no longer remember individual tuple offsets on a page but only the
+ * fact that a particular page needs to be visited.
+ *
+ *
+ * Copyright (c) 2003-2005, PostgreSQL Global Development Group
+ *
+ * $PostgreSQL: pgsql/src/include/nodes/tidbitmap.h,v 1.1 2005/04/17 22:24:02 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef TIDBITMAP_H
+#define TIDBITMAP_H
+
+#include "storage/itemptr.h"
+
+
+/*
+ * Actual bitmap representation is private to tidbitmap.c.  Callers can
+ * do IsA(x, TIDBitmap) on it, but nothing else.
+ */
+typedef struct TIDBitmap TIDBitmap;
+
+/* Result structure for tbm_iterate */
+typedef struct
+{
+	BlockNumber	blockno;		/* page number containing tuples */
+	int			ntuples;		/* -1 indicates lossy result */
+	OffsetNumber offsets[1];	/* VARIABLE LENGTH ARRAY */
+} TBMIterateResult;				/* VARIABLE LENGTH STRUCT */
+
+/* function prototypes in nodes/tidbitmap.c */
+
+extern TIDBitmap *tbm_create(long maxbytes);
+extern void tbm_free(TIDBitmap *tbm);
+
+extern void tbm_add_tuples(TIDBitmap *tbm, const ItemPointer tids, int ntids);
+
+extern void tbm_union(TIDBitmap *a, const TIDBitmap *b);
+extern void tbm_intersect(TIDBitmap *a, const TIDBitmap *b);
+
+extern void tbm_begin_iterate(TIDBitmap *tbm);
+extern TBMIterateResult *tbm_iterate(TIDBitmap *tbm);
+
+#endif   /* TIDBITMAP_H */