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diff --git a/src/include/partitioning/partdesc.h b/src/include/partitioning/partdesc.h
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+/*-------------------------------------------------------------------------
+ *
+ * partdesc.h
+ *
+ * Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ *
+ * src/include/partitioning/partdesc.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef PARTDESC_H
+#define PARTDESC_H
+
+#include "partitioning/partdefs.h"
+#include "utils/relcache.h"
+
+/*
+ * Information about partitions of a partitioned table.
+ *
+ * For partitioned tables where detached partitions exist, we only cache
+ * descriptors that include all partitions, including detached; when we're
+ * requested a descriptor without the detached partitions, we create one
+ * afresh each time.  (The reason for this is that the set of detached
+ * partitions that are visible to each caller depends on the snapshot it has,
+ * so it's pretty much impossible to evict a descriptor from cache at the
+ * right time.)
+ */
+typedef struct PartitionDescData
+{
+	int			nparts;			/* Number of partitions */
+	bool		detached_exist; /* Are there any detached partitions? */
+	Oid		   *oids;			/* Array of 'nparts' elements containing
+								 * partition OIDs in order of the their bounds */
+	bool	   *is_leaf;		/* Array of 'nparts' elements storing whether
+								 * the corresponding 'oids' element belongs to
+								 * a leaf partition or not */
+	PartitionBoundInfo boundinfo;	/* collection of partition bounds */
+} PartitionDescData;
+
+
+extern PartitionDesc RelationGetPartitionDesc(Relation rel, bool omit_detached);
+
+extern PartitionDirectory CreatePartitionDirectory(MemoryContext mcxt, bool omit_detached);
+extern PartitionDesc PartitionDirectoryLookup(PartitionDirectory, Relation);
+extern void DestroyPartitionDirectory(PartitionDirectory pdir);
+
+extern Oid	get_default_oid_from_partdesc(PartitionDesc partdesc);
+
+#endif							/* PARTCACHE_H */