Merge

sql/sql_lex.h

@@ -400,7 +400,7 @@ public:
     Base class for st_select_lex (SELECT_LEX) & 
     st_select_lex_unit (SELECT_LEX_UNIT)
 */
-struct st_lex;
+struct LEX;
 class st_select_lex;
 class st_select_lex_unit;
 class st_select_lex_node {
@@ -470,7 +470,7 @@ public:
   virtual void set_lock_for_tables(thr_lock_type lock_type) {}
 
   friend class st_select_lex_unit;
-  friend bool mysql_new_select(struct st_lex *lex, bool move_down);
+  friend bool mysql_new_select(LEX *lex, bool move_down);
   friend bool mysql_make_view(THD *thd, File_parser *parser,
                               TABLE_LIST *table, uint flags);
 private:
@@ -590,7 +590,7 @@ public:
   /* Saved values of the WHERE and HAVING clauses*/
   Item::cond_result cond_value, having_value;
   /* point on lex in which it was created, used in view subquery detection */
-  st_lex *parent_lex;
+  LEX *parent_lex;
   enum olap_type olap;
   /* FROM clause - points to the beginning of the TABLE_LIST::next_local list. */
   SQL_LIST	      table_list;
@@ -956,6 +956,9 @@ extern sys_var *trg_new_row_fake_var;
 enum xa_option_words {XA_NONE, XA_JOIN, XA_RESUME, XA_ONE_PHASE,
                       XA_SUSPEND, XA_FOR_MIGRATE};
 
+extern const LEX_STRING null_lex_str;
+extern const LEX_STRING empty_lex_str;
+
 
 /*
   Class representing list of all tables used by statement.
@@ -964,7 +967,7 @@ enum xa_option_words {XA_NONE, XA_JOIN, XA_RESUME, XA_ONE_PHASE,
   stored functions/triggers to this list in order to pre-open and lock
   them.
 
-  Also used by st_lex::reset_n_backup/restore_backup_query_tables_list()
+  Also used by LEX::reset_n_backup/restore_backup_query_tables_list()
   methods to save and restore this information.
 */
 
@@ -1492,9 +1495,13 @@ public:
 
   /**
     TRUE if we're parsing a prepared statement: in this mode
-    we should allow placeholders and disallow multi-statements.
+    we should allow placeholders.
   */
   bool stmt_prepare_mode;
+  /**
+    TRUE if we should allow multi-statements.
+  */
+  bool multi_statements;
 
   /** State of the lexical analyser for comments. */
   enum_comment_state in_comment;
@@ -1553,7 +1560,7 @@ protected:
     Constructor.
     @param lex the LEX structure that represents parts of this statement.
   */
-  Sql_statement(struct st_lex *lex)
+  Sql_statement(LEX *lex)
     : m_lex(lex)
   {}
 
@@ -1578,12 +1585,12 @@ protected:
     with the minimum set of attributes, instead of a LEX structure that
     contains the collection of every possible attribute.
   */
-  struct st_lex *m_lex;
+  LEX *m_lex;
 };
 
 /* The state of the lex parsing. This is saved in the THD struct */
 
-typedef struct st_lex : public Query_tables_list
+struct LEX: public Query_tables_list
 {
   SELECT_LEX_UNIT unit;                         /* most upper unit */
   SELECT_LEX select_lex;                        /* first SELECT_LEX */
@@ -1833,9 +1840,9 @@ typedef struct st_lex : public Query_tables_list
   */
   bool protect_against_global_read_lock;
 
-  st_lex();
+  LEX();
 
-  virtual ~st_lex()
+  virtual ~LEX()
   {
     destroy_query_tables_list();
     plugin_unlock_list(NULL, (plugin_ref *)plugins.buffer, plugins.elements);
@@ -1877,7 +1884,7 @@ typedef struct st_lex : public Query_tables_list
     Is this update command where 'WHITH CHECK OPTION' clause is important
 
     SYNOPSIS
-      st_lex::which_check_option_applicable()
+      LEX::which_check_option_applicable()
 
     RETURN
       TRUE   have to take 'WHITH CHECK OPTION' clause into account
@@ -1949,7 +1956,7 @@ typedef struct st_lex : public Query_tables_list
     }
     return FALSE;
   }
-} LEX;
+};
 
 
 /**
@@ -2040,7 +2047,7 @@ public:
 };
 
 
-struct st_lex_local: public st_lex
+struct st_lex_local: public LEX
 {
   static void *operator new(size_t size) throw()
   {