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diff --git a/storage/perfschema/pfs_digest.h b/storage/perfschema/pfs_digest.h
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+/* Copyright (c) 2011, 2022, Oracle and/or its affiliates.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License, version 2.0,
+  as published by the Free Software Foundation.
+
+  This program is also distributed with certain software (including
+  but not limited to OpenSSL) that is licensed under separate terms,
+  as designated in a particular file or component or in included license
+  documentation.  The authors of MySQL hereby grant you an additional
+  permission to link the program and your derivative works with the
+  separately licensed software that they have included with MySQL.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License, version 2.0, for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software Foundation,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#ifndef PFS_DIGEST_H
+#define PFS_DIGEST_H
+
+/**
+  @file storage/perfschema/pfs_digest.h
+  Statement Digest data structures (declarations).
+*/
+
+#include "pfs_column_types.h"
+#include "lf.h"
+#include "pfs_stat.h"
+#include "sql_digest.h"
+
+extern bool flag_statements_digest;
+extern size_t digest_max;
+extern ulong digest_lost;
+struct PFS_thread;
+
+/**
+  Structure to store a MD5 hash value (digest) for a statement.
+*/
+struct PFS_digest_key
+{
+  unsigned char m_md5[MD5_HASH_SIZE];
+  char m_schema_name[NAME_LEN];
+  uint m_schema_name_length;
+};
+
+/** A statement digest stat record. */
+struct PFS_ALIGNED PFS_statements_digest_stat
+{
+  /** Internal lock. */
+  pfs_lock m_lock;
+
+  /** Digest Schema + MD5 Hash. */
+  PFS_digest_key m_digest_key;
+
+  /** Digest Storage. */
+  sql_digest_storage m_digest_storage;
+
+  /** Statement stat. */
+  PFS_statement_stat m_stat;
+
+  /** First and last seen timestamps.*/
+  ulonglong m_first_seen;
+  ulonglong m_last_seen;
+
+  /** Reset data for this record. */
+  void reset_data(unsigned char* token_array, size_t length);
+  /** Reset data and remove index for this record. */
+  void reset_index(PFS_thread *thread);
+};
+
+int init_digest(const PFS_global_param *param);
+void cleanup_digest();
+
+int init_digest_hash(const PFS_global_param *param);
+void cleanup_digest_hash(void);
+PFS_statement_stat* find_or_create_digest(PFS_thread *thread,
+                                          const sql_digest_storage *digest_storage,
+                                          const char *schema_name,
+                                          uint schema_name_length);
+
+void reset_esms_by_digest();
+
+/* Exposing the data directly, for iterators. */
+extern PFS_statements_digest_stat *statements_digest_stat_array;
+
+extern LF_HASH digest_hash;
+
+#endif
+