1 files changed, 78 insertions, 0 deletions
diff --git a/src/include/access/gin.h b/src/include/access/gin.h
new file mode 100644
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--- /dev/null
+++ b/src/include/access/gin.h
@@ -0,0 +1,78 @@
+/*--------------------------------------------------------------------------
+ * gin.h
+ *	  Public header file for Generalized Inverted Index access method.
+ *
+ *	Copyright (c) 2006-2021, PostgreSQL Global Development Group
+ *
+ *	src/include/access/gin.h
+ *--------------------------------------------------------------------------
+ */
+#ifndef GIN_H
+#define GIN_H
+
+#include "access/xlogreader.h"
+#include "lib/stringinfo.h"
+#include "storage/block.h"
+#include "utils/relcache.h"
+
+
+/*
+ * amproc indexes for inverted indexes.
+ */
+#define GIN_COMPARE_PROC			   1
+#define GIN_EXTRACTVALUE_PROC		   2
+#define GIN_EXTRACTQUERY_PROC		   3
+#define GIN_CONSISTENT_PROC			   4
+#define GIN_COMPARE_PARTIAL_PROC	   5
+#define GIN_TRICONSISTENT_PROC		   6
+#define GIN_OPTIONS_PROC	   7
+#define GINNProcs					   7
+
+/*
+ * searchMode settings for extractQueryFn.
+ */
+#define GIN_SEARCH_MODE_DEFAULT			0
+#define GIN_SEARCH_MODE_INCLUDE_EMPTY	1
+#define GIN_SEARCH_MODE_ALL				2
+#define GIN_SEARCH_MODE_EVERYTHING		3	/* for internal use only */
+
+/*
+ * GinStatsData represents stats data for planner use
+ */
+typedef struct GinStatsData
+{
+	BlockNumber nPendingPages;
+	BlockNumber nTotalPages;
+	BlockNumber nEntryPages;
+	BlockNumber nDataPages;
+	int64		nEntries;
+	int32		ginVersion;
+} GinStatsData;
+
+/*
+ * A ternary value used by tri-consistent functions.
+ *
+ * This must be of the same size as a bool because some code will cast a
+ * pointer to a bool to a pointer to a GinTernaryValue.
+ */
+typedef char GinTernaryValue;
+
+#define GIN_FALSE		0		/* item is not present / does not match */
+#define GIN_TRUE		1		/* item is present / matches */
+#define GIN_MAYBE		2		/* don't know if item is present / don't know
+								 * if matches */
+
+#define DatumGetGinTernaryValue(X) ((GinTernaryValue)(X))
+#define GinTernaryValueGetDatum(X) ((Datum)(X))
+#define PG_RETURN_GIN_TERNARY_VALUE(x) return GinTernaryValueGetDatum(x)
+
+/* GUC parameters */
+extern PGDLLIMPORT int GinFuzzySearchLimit;
+extern int	gin_pending_list_limit;
+
+/* ginutil.c */
+extern void ginGetStats(Relation index, GinStatsData *stats);
+extern void ginUpdateStats(Relation index, const GinStatsData *stats,
+						   bool is_build);
+
+#endif							/* GIN_H */