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+/*
+ * AM-callable functions for BRIN indexes
+ *
+ * Portions Copyright (c) 1996-2021, 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 */