Changes of merge moved to oracle mode parser.

sql/sql_yacc_ora.yy

@@ -281,7 +281,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
   Currently there are 55 shift/reduce conflicts.
   We should not introduce new conflicts any more.
 */
-%expect 55
+%expect 54
 
 /*
    Comments for TOKENS.
@@ -1059,10 +1059,6 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %token  <kwd>  YEAR_SYM                      /* SQL-2003-R */
 
 
-%left   JOIN_SYM INNER_SYM STRAIGHT_JOIN CROSS LEFT RIGHT
-/* A dummy token to force the priority of table_ref production in a join. */
-%left   TABLE_REF_PRIORITY
-
 /*
   Give ESCAPE (in LIKE) a very low precedence.
   This allows the concatenation operator || to be used on the right
@@ -1072,6 +1068,9 @@ bool my_yyoverflow(short **a, YYSTYPE **b, size_t *yystacksize);
 %left   PREC_BELOW_ESCAPE
 %left   ESCAPE_SYM
 
+/* A dummy token to force the priority of table_ref production in a join. */
+%left   CONDITIONLESS_JOIN
+%left   JOIN_SYM INNER_SYM STRAIGHT_JOIN CROSS LEFT RIGHT ON_SYM USING
 %left   SET_VAR
 %left   OR_SYM OR2_SYM
 %left   XOR
@@ -11824,11 +11823,9 @@ derived_table_list:
         ;
 
 /*
-  Notice that JOIN is a left-associative operation, and it must be parsed
-  as such, that is, the parser must process first the left join operand
-  then the right one. Such order of processing ensures that the parser
-  produces correct join trees which is essential for semantic analysis
-  and subsequent optimization phases.
+  Notice that JOIN can be a left-associative operator in one context and
+  a right-associative operator in another context (see the comment for
+  st_select_lex::add_cross_joined_table).
 */
 join_table:
           /* INNER JOIN variants */
@@ -11837,8 +11834,13 @@ join_table:
             so that [INNER | CROSS] JOIN is properly nested as other
             left-associative joins.
           */
-          table_ref normal_join table_ref %prec TABLE_REF_PRIORITY
-          { MYSQL_YYABORT_UNLESS($1 && ($$=$3)); $3->straight=$2; }
+          table_ref normal_join table_ref %prec CONDITIONLESS_JOIN
+          {
+            MYSQL_YYABORT_UNLESS($1 && ($$=$3));
+
+            if (unlikely(Select->add_cross_joined_table($1, $3, $2)))
+              MYSQL_YYABORT;
+          }
         | table_ref normal_join table_ref
           ON
           {
@@ -11852,7 +11854,7 @@ join_table:
           {
 	    $3->straight=$2;
             add_join_on(thd, $3, $6);
-            Lex->pop_context();
+            $3->on_context= Lex->pop_context();
             Select->parsing_place= NO_MATTER;
           }
         | table_ref normal_join table_ref
@@ -11886,7 +11888,7 @@ join_table:
           expr
           {
             add_join_on(thd, $5, $8);
-            Lex->pop_context();
+            $5->on_context= Lex->pop_context();
             $5->outer_join|=JOIN_TYPE_LEFT;
             $$=$5;
             Select->parsing_place= NO_MATTER;
@@ -11925,7 +11927,7 @@ join_table:
             if (unlikely(!($$= lex->current_select->convert_right_join())))
               MYSQL_YYABORT;
             add_join_on(thd, $$, $8);
-            Lex->pop_context();
+            $1->on_context= Lex->pop_context();
             Select->parsing_place= NO_MATTER;
           }
         | table_ref RIGHT opt_outer JOIN_SYM table_factor