Merge next-mr -> next-4284.

sql/sql_lex.h

@@ -1425,6 +1425,17 @@ public:
   /** Interface with bison, value of the last token parsed. */
   LEX_YYSTYPE yylval;
 
+  /**
+    LALR(2) resolution, look ahead token.
+    Value of the next token to return, if any,
+    or -1, if no token was parsed in advance.
+    Note: 0 is a legal token, and represents YYEOF.
+  */
+  int lookahead_token;
+
+  /** LALR(2) resolution, value of the look ahead token.*/
+  LEX_YYSTYPE lookahead_yylval;
+
 private:
   /** Pointer to the current position in the raw input stream. */
   const char *m_ptr;