aliases with multi-table updates / deletes

fix for a bug with derived tables and query cache
ix for a charset bug in timestamp

mysql-test/r/multi_update.result

@@ -235,7 +235,7 @@ select * from t2;
 n	d
 1	30
 1	30
-UPDATE t1 a ,t2 b SET t1.d=t2.d,t2.d=30 WHERE a.n=b.n;
+UPDATE t1 a ,t2 b SET a.d=b.d,b.d=30 WHERE a.n=b.n;
 select * from t1;
 n	d
 1	30

mysql-test/r/query_cache.result

@@ -531,6 +531,7 @@ i
 show status like "Qcache_queries_in_cache";
 Variable_name	Value
 Qcache_queries_in_cache	2
+update t1 set i=(select distinct 1 from (select * from t2) a);
 drop table t1, t2, t3;
 use mysql;
 select * from db;

mysql-test/t/multi_update.test

@@ -213,7 +213,7 @@ insert into t2 values(1,10),(1,20);
 UPDATE t1,t2 SET t1.d=t2.d,t2.d=30 WHERE t1.n=t2.n;
 select * from t1;
 select * from t2;
-UPDATE t1 a ,t2 b SET t1.d=t2.d,t2.d=30 WHERE a.n=b.n;
+UPDATE t1 a ,t2 b SET a.d=b.d,b.d=30 WHERE a.n=b.n;
 select * from t1;
 select * from t2;
 DELETE t1, t2  FROM t1 a,t2 b where a.n=b.n;

mysql-test/t/outfile.test

@@ -21,3 +21,8 @@
 #select * into dumpfile "/tmp/select-test.99" from t1;
 #select load_file("/tmp/select-test.not-exist");
 #drop table t1;
+#drop table if exists t;
+#CREATE TABLE t (  t timestamp NOT NULL,  c char(200) character set latin1 NOT NULL default '',  KEY t (t)) TYPE=MyISAM;
+#INSERT INTO t VALUES ('2002-12-20 12:01:20','');
+#select * from t into outfile "fdg";
+#drop table if exists t;

mysql-test/t/query_cache.test

@@ -368,6 +368,7 @@ select * from t2;
 show status like "Qcache_queries_in_cache";
 select * from t3;
 show status like "Qcache_queries_in_cache";
+update t1 set i=(select distinct 1 from (select * from t2) a);
 drop table t1, t2, t3;
 
 #

sql/field.cc

@@ -2845,6 +2845,7 @@ String *Field_timestamp::val_str(String *val_buffer,
   val_buffer->alloc(field_length+1);
   char *to=(char*) val_buffer->ptr(),*end=to+field_length;
   val_buffer->length(field_length);
+  val_buffer->set_charset(val_ptr->charset());
 
 #ifdef WORDS_BIGENDIAN
   if (table->db_low_byte_first)

sql/sql_parse.cc

@@ -3003,7 +3003,7 @@ mysql_init_query(THD *thd)
   lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
   lex->olap=lex->describe=0;
   lex->derived_tables= false;
-  lex->lock_option=TL_UNLOCK;
+  lex->lock_option=TL_READ;
   thd->check_loops_counter= thd->select_number=
     lex->select_lex.select_number= 1;
   thd->free_list= 0;

sql/sql_yacc.yy

@@ -2522,7 +2522,7 @@ join_table:
 	  lex->current_select= unit->outer_select();
 	  if (!($$= lex->current_select->
                 add_table_to_list(lex->thd, new Table_ident(unit), $5, 0,
-				  lex->lock_option,(List<String> *)0,
+				  TL_READ,(List<String> *)0,
 	                          (List<String> *)0)))
 
 	    YYABORT;