Merge mhansson@bk-internal:/home/bk/mysql-5.0-opt

into  linux-st28.site:/home/martin/mysql/src/bug32798-united/my50-bug32798-united-push

mysql-test/r/union.result

@@ -1440,4 +1440,46 @@ UNION
 SELECT 1,1;
 ERROR HY000: Incorrect usage of UNION and ORDER BY
 DROP TABLE t1,t2;
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1);
+SELECT a INTO @v FROM (
+SELECT a FROM t1
+UNION
+SELECT a FROM t1
+) alias;
+SELECT a INTO OUTFILE 'union.out.file' FROM (
+SELECT a FROM t1
+UNION
+SELECT a FROM t1 WHERE 0
+) alias;
+SELECT a INTO DUMPFILE 'union.out.file2' FROM (
+SELECT a FROM t1
+UNION
+SELECT a FROM t1 WHERE 0
+) alias;
+SELECT a FROM (
+SELECT a FROM t1
+UNION
+SELECT a INTO @v FROM t1
+) alias;
+SELECT a FROM (
+SELECT a FROM t1
+UNION
+SELECT a INTO OUTFILE 'union.out.file3' FROM t1
+) alias;
+SELECT a FROM (
+SELECT a FROM t1
+UNION
+SELECT a INTO DUMPFILE 'union.out.file4' FROM t1
+) alias;
+SELECT a FROM t1 UNION SELECT a INTO @v FROM t1;
+SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file5' FROM t1;
+SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file6' FROM t1;
+SELECT a INTO @v FROM t1 UNION SELECT a FROM t1;
+ERROR HY000: Incorrect usage of UNION and INTO
+SELECT a INTO OUTFILE 'union.out.file7' FROM t1 UNION SELECT a FROM t1;
+ERROR HY000: Incorrect usage of UNION and INTO
+SELECT a INTO DUMPFILE 'union.out.file8' FROM t1 UNION SELECT a FROM t1;
+ERROR HY000: Incorrect usage of UNION and INTO
+DROP TABLE t1;
 End of 5.0 tests

mysql-test/t/union.test

@@ -921,4 +921,61 @@ SELECT 1,1;
 
 DROP TABLE t1,t2;
 
+# Bug#32858: Erro: "Incorrect usage of UNION and INTO" does not take subselects 
+# into account
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1);
+
+SELECT a INTO @v FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a FROM t1
+) alias;
+
+SELECT a INTO OUTFILE 'union.out.file' FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a FROM t1 WHERE 0
+) alias;
+
+SELECT a INTO DUMPFILE 'union.out.file2' FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a FROM t1 WHERE 0
+) alias;
+
+#
+# INTO will not be allowed in subqueries in version 5.1 and above.
+#
+SELECT a FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a INTO @v FROM t1
+) alias;
+
+SELECT a FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a INTO OUTFILE 'union.out.file3' FROM t1
+) alias;
+
+SELECT a FROM (
+  SELECT a FROM t1
+  UNION
+  SELECT a INTO DUMPFILE 'union.out.file4' FROM t1
+) alias;
+
+SELECT a FROM t1 UNION SELECT a INTO @v FROM t1;
+SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file5' FROM t1;
+SELECT a FROM t1 UNION SELECT a INTO OUTFILE 'union.out.file6' FROM t1;
+--error ER_WRONG_USAGE
+SELECT a INTO @v FROM t1 UNION SELECT a FROM t1;
+--error ER_WRONG_USAGE
+SELECT a INTO OUTFILE 'union.out.file7' FROM t1 UNION SELECT a FROM t1;
+--error ER_WRONG_USAGE
+SELECT a INTO DUMPFILE 'union.out.file8' FROM t1 UNION SELECT a FROM t1;
+
+DROP TABLE t1;
+
 --echo End of 5.0 tests

sql/sql_class.cc

@@ -931,6 +931,7 @@ void THD::rollback_item_tree_changes()
 select_result::select_result()
 {
   thd=current_thd;
+  nest_level= -1;
 }
 
 void select_result::send_error(uint errcode,const char *err)

sql/sql_class.h

@@ -1912,6 +1912,7 @@ class select_result :public Sql_alloc {
 protected:
   THD *thd;
   SELECT_LEX_UNIT *unit;
+  uint nest_level;
 public:
   select_result();
   virtual ~select_result() {};
@@ -1948,6 +1949,12 @@ class select_result :public Sql_alloc {
   */
   virtual void cleanup();
   void set_thd(THD *thd_arg) { thd= thd_arg; }
+  /**
+     The nest level, if supported. 
+     @return
+     -1 if nest level is undefined, otherwise a positive integer.
+   */
+  int get_nest_level() { return nest_level; }
 #ifdef EMBEDDED_LIBRARY
   virtual void begin_dataset() {}
 #else
@@ -2034,7 +2041,14 @@ class select_export :public select_to_file {
   bool is_unsafe_field_sep;
   bool fixed_row_size;
 public:
-  select_export(sql_exchange *ex) :select_to_file(ex) {}
+  /**
+     Creates a select_export to represent INTO OUTFILE <filename> with a
+     defined level of subquery nesting.
+   */
+  select_export(sql_exchange *ex, uint nest_level_arg) :select_to_file(ex) 
+  {
+    nest_level= nest_level_arg;
+  }
   ~select_export();
   int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
   bool send_data(List<Item> &items);
@@ -2043,7 +2057,15 @@ class select_export :public select_to_file {
 
 class select_dump :public select_to_file {
 public:
-  select_dump(sql_exchange *ex) :select_to_file(ex) {}
+  /**
+     Creates a select_export to represent INTO DUMPFILE <filename> with a
+     defined level of subquery nesting.
+   */  
+  select_dump(sql_exchange *ex, uint nest_level_arg) : 
+    select_to_file(ex) 
+  {
+    nest_level= nest_level_arg;
+  }
   int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
   bool send_data(List<Item> &items);
 };
@@ -2461,7 +2483,16 @@ class select_dumpvar :public select_result_interceptor {
   ha_rows row_count;
 public:
   List<my_var> var_list;
-  select_dumpvar()  { var_list.empty(); row_count= 0;}
+  /**
+     Creates a select_dumpvar to represent INTO <variable> with a defined 
+     level of subquery nesting.
+   */
+  select_dumpvar(uint nest_level_arg)
+  {
+    var_list.empty();
+    row_count= 0;
+    nest_level= nest_level_arg;
+  }
   ~select_dumpvar() {}
   int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
   bool send_data(List<Item> &items);

sql/sql_yacc.yy

@@ -6350,7 +6350,8 @@ procedure_item:
 select_var_list_init:
 	   {
              LEX *lex=Lex;
-	     if (!lex->describe && (!(lex->result= new select_dumpvar())))
+	     if (!lex->describe && 
+                 (!(lex->result= new select_dumpvar(lex->nest_level))))
 	        MYSQL_YYABORT;
 	   }
 	   select_var_list
@@ -6424,7 +6425,7 @@ into_destination:
           LEX *lex= Lex;
           lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
           if (!(lex->exchange= new sql_exchange($2.str, 0)) ||
-              !(lex->result= new select_export(lex->exchange)))
+              !(lex->result= new select_export(lex->exchange, lex->nest_level)))
             MYSQL_YYABORT;
 	}
 	opt_field_term opt_line_term
@@ -6436,7 +6437,7 @@ into_destination:
 	    lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
 	    if (!(lex->exchange= new sql_exchange($2.str,1)))
 	      MYSQL_YYABORT;
-	    if (!(lex->result= new select_dump(lex->exchange)))
+	    if (!(lex->result= new select_dump(lex->exchange, lex->nest_level)))
 	      MYSQL_YYABORT;
 	  }
 	}
@@ -9427,12 +9428,18 @@ union_list:
 	UNION_SYM union_option
 	{
 	  LEX *lex=Lex;
-	  if (lex->result)
-	  {
-	    /* Only the last SELECT can have  INTO...... */
-	    my_error(ER_WRONG_USAGE, MYF(0), "UNION", "INTO");
-	    MYSQL_YYABORT;
-	  }
+	  if (lex->result && 
+              (lex->result->get_nest_level() == -1 ||
+               lex->result->get_nest_level() == lex->nest_level))
+          {
+            /* 
+               Only the last SELECT can have INTO unless the INTO and UNION
+               are at different nest levels. In version 5.1 and above, INTO
+               will onle be allowed at top level.
+            */
+            my_error(ER_WRONG_USAGE, MYF(0), "UNION", "INTO");
+            MYSQL_YYABORT;
+          }
 	  if (lex->current_select->linkage == GLOBAL_OPTIONS_TYPE)
 	  {
             my_parse_error(ER(ER_SYNTAX_ERROR));