1 files changed, 64 insertions, 0 deletions
diff --git a/src/include/statistics/extended_stats_internal.h b/src/include/statistics/extended_stats_internal.h
new file mode 100644
index 00000000000..961f1f78c08
--- /dev/null
+++ b/src/include/statistics/extended_stats_internal.h
@@ -0,0 +1,64 @@
+/*-------------------------------------------------------------------------
+ *
+ * extended_stats_internal.h
+ *	  POSTGRES extended statistics internal declarations
+ *
+ * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/include/statistics/extended_stats_internal.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef EXTENDED_STATS_INTERNAL_H
+#define EXTENDED_STATS_INTERNAL_H
+
+#include "utils/sortsupport.h"
+#include "statistics/statistics.h"
+
+
+typedef struct
+{
+	Oid			eqopr;			/* '=' operator for datatype, if any */
+	Oid			eqfunc;			/* and associated function */
+	Oid			ltopr;			/* '<' operator for datatype, if any */
+} StdAnalyzeData;
+
+typedef struct
+{
+	Datum		value;			/* a data value */
+	int			tupno;			/* position index for tuple it came from */
+} ScalarItem;
+
+/* multi-sort */
+typedef struct MultiSortSupportData
+{
+	int			ndims;			/* number of dimensions supported by the */
+	SortSupportData ssup[1];	/* sort support data for each dimension */
+} MultiSortSupportData;
+
+typedef MultiSortSupportData *MultiSortSupport;
+
+typedef struct SortItem
+{
+	Datum	   *values;
+	bool	   *isnull;
+} SortItem;
+
+extern MVNDistinct *statext_ndistinct_build(double totalrows,
+						int numrows, HeapTuple *rows,
+						Bitmapset *attrs, VacAttrStats **stats);
+extern bytea *statext_ndistinct_serialize(MVNDistinct *ndistinct);
+extern MVNDistinct *statext_ndistinct_deserialize(bytea *data);
+
+extern MultiSortSupport multi_sort_init(int ndims);
+extern void multi_sort_add_dimension(MultiSortSupport mss, int sortdim,
+						 Oid oper);
+extern int	multi_sort_compare(const void *a, const void *b, void *arg);
+extern int multi_sort_compare_dim(int dim, const SortItem * a,
+					   const SortItem * b, MultiSortSupport mss);
+extern int multi_sort_compare_dims(int start, int end, const SortItem * a,
+						const SortItem * b, MultiSortSupport mss);
+
+#endif   /* EXTENDED_STATS_INTERNAL_H */