1 files changed, 88 insertions, 0 deletions
diff --git a/src/include/access/brin_internal.h b/src/include/access/brin_internal.h
new file mode 100644
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+++ b/src/include/access/brin_internal.h
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+/*
+ * brin_internal.h
+ *		internal declarations for BRIN indexes
+ *
+ * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		src/include/access/brin_internal.h
+ */
+#ifndef BRIN_INTERNAL_H
+#define BRIN_INTERNAL_H
+
+#include "fmgr.h"
+#include "storage/buf.h"
+#include "storage/bufpage.h"
+#include "storage/off.h"
+#include "utils/relcache.h"
+
+
+/*
+ * A BrinDesc is a struct designed to enable decoding a BRIN tuple from the
+ * on-disk format to an in-memory tuple and vice-versa.
+ */
+
+/* struct returned by "OpcInfo" amproc */
+typedef struct BrinOpcInfo
+{
+	/* Number of columns stored in an index column of this opclass */
+	uint16		oi_nstored;
+
+	/* Opaque pointer for the opclass' private use */
+	void	   *oi_opaque;
+
+	/* Type IDs of the stored columns */
+	Oid			oi_typids[FLEXIBLE_ARRAY_MEMBER];
+} BrinOpcInfo;
+
+/* the size of a BrinOpcInfo for the given number of columns */
+#define SizeofBrinOpcInfo(ncols) \
+	(offsetof(BrinOpcInfo, oi_typids) + sizeof(Oid) * ncols)
+
+typedef struct BrinDesc
+{
+	/* Containing memory context */
+	MemoryContext bd_context;
+
+	/* the index relation itself */
+	Relation	bd_index;
+
+	/* tuple descriptor of the index relation */
+	TupleDesc	bd_tupdesc;
+
+	/* cached copy for on-disk tuples; generated at first use */
+	TupleDesc	bd_disktdesc;
+
+	/* total number of Datum entries that are stored on-disk for all columns */
+	int			bd_totalstored;
+
+	/* per-column info; bd_tupdesc->natts entries long */
+	BrinOpcInfo *bd_info[FLEXIBLE_ARRAY_MEMBER];
+} BrinDesc;
+
+/*
+ * Globally-known function support numbers for BRIN indexes.  Individual
+ * opclasses define their own function support numbers, which must not collide
+ * with the definitions here.
+ */
+#define BRIN_PROCNUM_OPCINFO		1
+#define BRIN_PROCNUM_ADDVALUE		2
+#define BRIN_PROCNUM_CONSISTENT		3
+#define BRIN_PROCNUM_UNION			4
+/* procedure numbers up to 10 are reserved for BRIN future expansion */
+
+#define BRIN_DEBUG
+
+/* we allow debug if using GCC; otherwise don't bother */
+#if defined(BRIN_DEBUG) && defined(__GNUC__)
+#define BRIN_elog(level, ...)		elog(level, __VA_ARGS__)
+#else
+#define BRIN_elog(a)	void(0)
+#endif
+
+/* brin.c */
+extern BrinDesc *brin_build_desc(Relation rel);
+extern void brin_free_desc(BrinDesc *bdesc);
+
+#endif   /* BRIN_INTERNAL_H */