Adding upstream version 1:10.11.6.upstream/1%10.11.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 118 insertions, 0 deletions

diff --git a/storage/perfschema/table_session_variables.h b/storage/perfschema/table_session_variables.h
new file mode 100644
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--- /dev/null
+++ b/storage/perfschema/table_session_variables.h
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+/* Copyright (c) 2015, 2023, 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+#ifndef TABLE_SESSION_VARIABLES_H
+#define TABLE_SESSION_VARIABLES_H
+
+/**
+  @file storage/perfschema/table_session_variables.h
+  Table SESSION_VARIABLES (declarations).
+*/
+
+#include "pfs_column_types.h"
+#include "pfs_engine_table.h"
+#include "pfs_instr_class.h"
+#include "pfs_instr.h"
+#include "table_helper.h"
+#include "pfs_variable.h"
+/**
+  @addtogroup Performance_schema_tables
+  @{
+*/
+
+/**
+  Store and retrieve table state information during queries that reinstantiate
+  the table object.
+*/
+class table_session_variables_context : public PFS_table_context
+{
+public:
+  table_session_variables_context(ulonglong hash_version, bool restore) :
+    PFS_table_context(hash_version, restore, THR_PFS_SV) {}
+};
+
+/**
+  A row of table
+  PERFORMANCE_SCHEMA.SESSION_VARIABLES.
+*/
+struct row_session_variables
+{
+  /** Column VARIABLE_NAME. */
+  PFS_variable_name_row m_variable_name;
+  /** Column VARIABLE_VALUE. */
+  PFS_variable_value_row m_variable_value;
+};
+
+/** Table PERFORMANCE_SCHEMA.SESSION_VARIABLES. */
+class table_session_variables : public PFS_engine_table
+{
+  typedef PFS_simple_index pos_t;
+
+public:
+  static PFS_engine_table_share_state m_share_state;
+  /** Table share */
+  static PFS_engine_table_share m_share;
+  static PFS_engine_table* create();
+  static ha_rows get_row_count();
+
+  virtual int rnd_init(bool scan);
+  virtual int rnd_next();
+  virtual int rnd_pos(const void *pos);
+  virtual void reset_position(void);
+
+protected:
+  virtual int read_row_values(TABLE *table,
+                              unsigned char *buf,
+                              Field **fields,
+                              bool read_all);
+  table_session_variables();
+
+public:
+  ~table_session_variables()
+  {}
+
+protected:
+  void make_row(const System_variable *system_var);
+
+private:
+  /** Table share lock. */
+  static THR_LOCK m_table_lock;
+  /** Fields definition. */
+  static TABLE_FIELD_DEF m_field_def;
+
+  /** Current THD variables. */
+  PFS_system_variable_cache m_sysvar_cache;
+  /** Current row. */
+  row_session_variables m_row;
+  /** True if the current row exists. */
+  bool m_row_exists;
+  /** Current position. */
+  pos_t m_pos;
+  /** Next position. */
+  pos_t m_next_pos;
+
+  /** Table context with system variable hash version. */
+  table_session_variables_context *m_context;
+};
+
+/** @} */
+#endif