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diff --git a/src/include/access/session.h b/src/include/access/session.h
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+/*-------------------------------------------------------------------------
+ *
+ * session.h
+ * Encapsulation of user session.
+ *
+ * Copyright (c) 2017-2021, PostgreSQL Global Development Group
+ *
+ * src/include/access/session.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SESSION_H
+#define SESSION_H
+
+#include "lib/dshash.h"
+
+/* Avoid including typcache.h */
+struct SharedRecordTypmodRegistry;
+
+/*
+ * A struct encapsulating some elements of a user's session. For now this
+ * manages state that applies to parallel query, but in principle it could
+ * include other things that are currently global variables.
+ */
+typedef struct Session
+{
+ dsm_segment *segment; /* The session-scoped DSM segment. */
+ dsa_area *area; /* The session-scoped DSA area. */
+
+ /* State managed by typcache.c. */
+ struct SharedRecordTypmodRegistry *shared_typmod_registry;
+ dshash_table *shared_record_table;
+ dshash_table *shared_typmod_table;
+} Session;
+
+extern void InitializeSession(void);
+extern dsm_handle GetSessionDsmHandle(void);
+extern void AttachSession(dsm_handle handle);
+extern void DetachSession(void);
+
+/* The current session, or NULL for none. */
+extern Session *CurrentSession;
+
+#endif /* SESSION_H */