statistics.h

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/* Copyright (c) 2017, 2025, 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.
 
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   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
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef DD_SYSTEM_VIEWS__STATISTICS_INCLUDED
#define DD_SYSTEM_VIEWS__STATISTICS_INCLUDED
 
#include "sql/dd/impl/system_views/system_view_definition_impl.h"
#include "sql/dd/impl/system_views/system_view_impl.h"
#include "sql/dd/string_type.h"
 
namespace dd {
namespace system_views {
 
/*
  The class representing INFORMATION_SCHEMA.STATISTICS system view
  definition.
*/
class Statistics_base
    : public System_view_impl<System_view_select_definition_impl> {
 public:
  enum enum_fields {
    FIELD_TABLE_CATALOG,
    FIELD_TABLE_SCHEMA,
    FIELD_TABLE_NAME,
    FIELD_NON_UNIQUE,
    FIELD_INDEX_SCHEMA,
    FIELD_INDEX_NAME,
    FIELD_SEQ_IN_INDEX,
    FIELD_COLUMN_NAME,
    FIELD_COLLATION,
    FIELD_CARDINALITY,
    FIELD_SUB_PART,
    FIELD_PACKED,
    FIELD_NULLABLE,
    FIELD_INDEX_TYPE,
    FIELD_COMMENT,
    FIELD_INDEX_COMMENT,
    FIELD_IS_VISIBLE,
    FIELD_INDEX_ORDINAL_POSITION,
    FIELD_COLUMN_ORDINAL_POSITION,
    FIELD_EXPRESSION
  };
 
  Statistics_base();
 
  const String_type &name() const override = 0;
};
 
/*
 The class representing INFORMATION_SCHEMA.STATISTICS system view definition
*/
class Statistics : public Statistics_base {
 public:
  Statistics();
 
  static const Statistics_base &instance();
 
  static const String_type &view_name() {
    static String_type s_view_name("STATISTICS");
    return s_view_name;
  }
 
  const String_type &name() const override { return Statistics::view_name(); }
};
 
/*
 The class represents system view definition used by SHOW STATISTICS when
*/
class Show_statistics : public Statistics {
 public:
  Show_statistics();
 
  static const Statistics_base &instance();
 
  static const String_type &view_name() {
    static String_type s_view_name("SHOW_STATISTICS");
    return s_view_name;
  }
 
  const String_type &name() const override {
    return Show_statistics::view_name();
  }
 
  // This view definition is hidden from user.
  bool hidden() const override { return true; }
};
 
}  // namespace system_views
}  // namespace dd
 
#endif  // DD_SYSTEM_VIEWS__STATISTICS_INCLUDED