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drizzled/table_list.h
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 *    (TableList::derived == NULL)
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 *    - subquery - TableList::table is a temp table
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 *    (TableList::derived != NULL)
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 *    - information schema table
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 *    (TableList::schema_table != NULL)
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 *    
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 *    @note
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 *
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    db(NULL),
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    alias(NULL),
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    table_name(NULL),
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    schema_table_name(NULL),
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    option(NULL),
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    on_expr(NULL),
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    table(NULL),
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    index_hints(NULL),
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    derived_result(NULL),
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    derived(NULL),
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    schema_table(NULL),
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    schema_select_lex(NULL),
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    schema_table_param(NULL),
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    select_lex(NULL),
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    next_leaf(NULL),
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    outer_join(0),
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    is_alias(false),
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    is_fqtn(false),
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    has_db_lookup_value(false),
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    has_table_lookup_value(false),
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    table_open_method(0)
 
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    has_table_lookup_value(false)
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  {}
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  /**
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  char *db;
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  const char *alias;
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  char *table_name;
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  char *schema_table_name;
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  char *option; ///< Used by cache index
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  Item *on_expr; ///< Used with outer join
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  Table *table; ///< opened table
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   */
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  select_union *derived_result;
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  Select_Lex_Unit *derived; ///< Select_Lex_Unit of derived table */
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  drizzled::plugin::InfoSchemaTable *schema_table; ///< Information_schema table
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  Select_Lex *schema_select_lex;
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  Tmp_Table_Param *schema_table_param;
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  /** link to select_lex where this table was used */
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  Select_Lex *select_lex;
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  /**
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  bool has_db_lookup_value;
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  bool has_table_lookup_value;
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  uint32_t table_open_method;
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  enum enum_schema_table_state schema_table_state;
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  void set_underlying_merge();
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  bool setup_underlying(Session *session);