1 files changed, 55 insertions, 0 deletions
diff --git a/src/include/access/brin.h b/src/include/access/brin.h
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+++ b/src/include/access/brin.h
@@ -0,0 +1,55 @@
+/*
+ * AM-callable functions for BRIN indexes
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		src/include/access/brin.h
+ */
+#ifndef BRIN_H
+#define BRIN_H
+
+#include "nodes/execnodes.h"
+#include "utils/relcache.h"
+
+
+/*
+ * Storage type for BRIN's reloptions
+ */
+typedef struct BrinOptions
+{
+	int32		vl_len_;		/* varlena header (do not touch directly!) */
+	BlockNumber pagesPerRange;
+	bool		autosummarize;
+} BrinOptions;
+
+
+/*
+ * BrinStatsData represents stats data for planner use
+ */
+typedef struct BrinStatsData
+{
+	BlockNumber pagesPerRange;
+	BlockNumber revmapNumPages;
+} BrinStatsData;
+
+
+#define BRIN_DEFAULT_PAGES_PER_RANGE	128
+#define BrinGetPagesPerRange(relation) \
+	(AssertMacro(relation->rd_rel->relkind == RELKIND_INDEX && \
+				 relation->rd_rel->relam == BRIN_AM_OID), \
+	 (relation)->rd_options ? \
+	 ((BrinOptions *) (relation)->rd_options)->pagesPerRange : \
+	  BRIN_DEFAULT_PAGES_PER_RANGE)
+#define BrinGetAutoSummarize(relation) \
+	(AssertMacro(relation->rd_rel->relkind == RELKIND_INDEX && \
+				 relation->rd_rel->relam == BRIN_AM_OID), \
+	 (relation)->rd_options ? \
+	 ((BrinOptions *) (relation)->rd_options)->autosummarize : \
+	  false)
+
+
+extern void brinGetStats(Relation index, BrinStatsData *stats);
+
+#endif							/* BRIN_H */