fixed union types merging and table related metadata (BUG#8824)

mysql-test/r/func_group.result:
  new result
mysql-test/r/metadata.result:
  new result
  test of metadata of variables, unions and derived tables
mysql-test/r/union.result:
  new results
  test of union of enum
mysql-test/t/metadata.test:
  test of metadata of variables, unions and derived tables
mysql-test/t/union.test:
  test of union of enum
sql/field.cc:
  Field type merging rules added
  Fixed table name/alias returting for field made from temporary tables
sql/field.h:
  removed unned field type reporting
sql/item.cc:
  fixed bug in NEW_DATE type field creartion
  replaced mechanism of merging types of UNION
sql/item.h:
  replaced mechanism of merging types of UNION
sql/item_func.h:
  new item type to make correct field type detection possible
sql/item_subselect.cc:
  added table name parameter to prepare() to show right table alias for derived tables
sql/sql_derived.cc:
  added table name parameter to prepare() to show right table alias for derived tables
sql/sql_lex.h:
  added table name parameter to prepare() to show right table alias for derived tables
sql/sql_parse.cc:
  made function for enum/set pack length calculation
sql/sql_prepare.cc:
  added table name parameter to prepare() to show right table alias for derived tables
sql/sql_select.cc:
  new temporary table field creation by Item_type_holder
  fixed table alias for temporary table
sql/sql_union.cc:
  added table name parameter to prepare() to show right table alias for derived tables

5 files changed, 111 insertions, 13 deletions

diff --git a/mysql-test/r/func_group.result b/mysql-test/r/func_group.result
index c22d0d3bec8..2fb18ca92c7 100644
--- a/mysql-test/r/func_group.result
+++ b/mysql-test/r/func_group.result
@@ -747,7 +747,7 @@ insert into t1 values (now());
 create table t2 select f2 from (select max(now()) f2 from t1) a;
 show columns from t2;
 Field	Type	Null	Key	Default	Extra
-f2	datetime			0000-00-00 00:00:00	
+f2	datetime	YES		NULL	
 drop table t2;
 create table t2 select f2 from (select now() f2 from t1) a;
 show columns from t2;
diff --git a/mysql-test/r/metadata.result b/mysql-test/r/metadata.result
index 54b3f1e0466..d691a200b7e 100644
--- a/mysql-test/r/metadata.result
+++ b/mysql-test/r/metadata.result
@@ -55,8 +55,33 @@ id	data	data
 2	female	no
 select t1.id from t1 union select t2.id from t2;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Name	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def	test	t1	t1	id	id	1	3	1	Y	32768	0	63
+def				id	id	1	4	1	Y	32768	0	63
 id
 1
 2
 drop table t1,t2;
+create table t1 ( a int, b varchar(30), primary key(a));
+insert into t1 values (1,'one');
+insert into t1 values (2,'two');
+set @arg00=1 ;
+select @arg00 FROM t1 where a=1 union distinct select 1 FROM t1 where a=1;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Name	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def				@arg00	@arg00	8	20	1	Y	32768	0	63
+@arg00
+1
+select * from (select @arg00) aaa;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Name	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def			aaa	@arg00	@arg00	8	20	1	Y	32768	0	63
+@arg00
+1
+select 1 union select 1;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Name	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def				1	1	8	20	1	N	32769	0	63
+1
+1
+select * from (select 1 union select 1) aaa;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Name	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def			aaa	1	1	8	20	1	N	32769	0	63
+1
+1
+drop table t1;
diff --git a/mysql-test/r/union.result b/mysql-test/r/union.result
index f58f0f5b0ac..6fcdf7c5db5 100644
--- a/mysql-test/r/union.result
+++ b/mysql-test/r/union.result
@@ -655,7 +655,7 @@ f
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `f` binary(24) default NULL
+  `f` varbinary(24) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT y from t2 UNION select da from t2;
@@ -666,7 +666,7 @@ y
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `y` binary(10) default NULL
+  `y` varbinary(10) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT y from t2 UNION select dt from t2;
@@ -677,7 +677,7 @@ y
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `y` binary(19) default NULL
+  `y` varbinary(19) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT da from t2 UNION select dt from t2;
@@ -699,7 +699,7 @@ testc
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `dt` binary(19) default NULL
+  `dt` varbinary(19) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT dt from t2 UNION select sv from t2;
@@ -710,7 +710,7 @@ testv
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `dt` binary(19) default NULL
+  `dt` varbinary(19) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT sc from t2 UNION select sv from t2;
@@ -732,7 +732,7 @@ tetetetetest
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `dt` blob
+  `dt` longblob
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT sv from t2 UNION select b from t2;
@@ -755,7 +755,7 @@ tetetetetest
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `i` blob
+  `i` longblob
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT sv from t2 UNION select tx from t2;
@@ -766,7 +766,7 @@ teeeeeeeeeeeest
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `sv` text
+  `sv` longtext
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 SELECT b from t2 UNION select tx from t2;
@@ -1069,7 +1069,7 @@ create table t1 as
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `_latin1'test' collate latin1_bin` char(4) character set latin1 collate latin1_bin NOT NULL default ''
+  `_latin1'test' collate latin1_bin` varchar(4) character set latin1 collate latin1_bin NOT NULL default ''
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 select count(*) from t1;
 count(*)
@@ -1082,7 +1082,7 @@ create table t1 as
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `test` char(4) character set latin1 collate latin1_bin NOT NULL default ''
+  `test` varchar(4) character set latin1 collate latin1_bin NOT NULL default ''
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 select count(*) from t1;
 count(*)
@@ -1095,7 +1095,7 @@ create table t1 as
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `test` char(4) character set latin1 collate latin1_bin NOT NULL default ''
+  `test` varchar(4) character set latin1 collate latin1_bin NOT NULL default ''
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 select count(*) from t1;
 count(*)
@@ -1195,3 +1195,38 @@ a	b
 2	b
 3	c
 drop table t1;
+CREATE TABLE t1 (
+a ENUM('ä','ö','ü') character set utf8 not null default 'ü',
+b ENUM("one", "two") character set utf8,
+c ENUM("one", "two")
+);
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` enum('ä','ö','ü') character set utf8 NOT NULL default 'ü',
+  `b` enum('one','two') character set utf8 default NULL,
+  `c` enum('one','two') default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values ('ä', 'one', 'one'), ('ö', 'two', 'one'), ('ü', NULL, NULL);
+create table t2 select NULL union select a from t1;
+show columns from t2;
+Field	Type	Null	Key	Default	Extra
+NULL	enum('ä','ö','ü')	YES		NULL	
+drop table t2;
+create table t2 select a from t1 union select NULL;
+show columns from t2;
+Field	Type	Null	Key	Default	Extra
+a	enum('ä','ö','ü')	YES		NULL	
+drop table t2;
+create table t2 select a from t1 union select a from t1;
+show columns from t2;
+Field	Type	Null	Key	Default	Extra
+a	char(1)				
+drop table t2;
+create table t2 select a from t1 union select c from t1;
+ERROR HY000: Illegal mix of collations (utf8_general_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation 'UNION'
+create table t2 select a from t1 union select b from t1;
+show columns from t2;
+Field	Type	Null	Key	Default	Extra
+a	varchar(3)	YES		NULL	
+drop table t2, t1;
diff --git a/mysql-test/t/metadata.test b/mysql-test/t/metadata.test
index d11cb62b04e..ebd58ef4ebb 100644
--- a/mysql-test/t/metadata.test
+++ b/mysql-test/t/metadata.test
@@ -34,4 +34,17 @@ select t1.id, t1.data, t2.data from t1, t2 where t1.id = t2.id order by t1.id;
 select t1.id from t1 union select t2.id from t2;
 drop table t1,t2;
 
+#
+# variables union and derived tables metadata test
+#
+create table t1 ( a int, b varchar(30), primary key(a));
+insert into t1 values (1,'one');
+insert into t1 values (2,'two');
+set @arg00=1 ;
+select @arg00 FROM t1 where a=1 union distinct select 1 FROM t1 where a=1;
+select * from (select @arg00) aaa;
+select 1 union select 1;
+select * from (select 1 union select 1) aaa;
+drop table t1;
+
 --disable_metadata
diff --git a/mysql-test/t/union.test b/mysql-test/t/union.test
index 82f26f63254..88dc5e0d06a 100644
--- a/mysql-test/t/union.test
+++ b/mysql-test/t/union.test
@@ -711,3 +711,28 @@ select * from ((select * from t1 limit 1) union (select * from t1 limit 1) union
 select * from ((((select * from t1))) union (select * from t1) union (select * from t1)) a;
 select * from ((select * from t1) union (((select * from t1))) union (select * from t1)) a;
 drop table t1;
+
+#
+# Enum merging test
+#
+CREATE TABLE t1 (
+  a ENUM('ä','ö','ü') character set utf8 not null default 'ü',
+  b ENUM("one", "two") character set utf8,
+  c ENUM("one", "two")
+);
+show create table t1;
+insert into t1 values ('ä', 'one', 'one'), ('ö', 'two', 'one'), ('ü', NULL, NULL);
+create table t2 select NULL union select a from t1;
+show columns from t2;
+drop table t2;
+create table t2 select a from t1 union select NULL;
+show columns from t2;
+drop table t2;
+create table t2 select a from t1 union select a from t1;
+show columns from t2;
+drop table t2;
+-- error 1267
+create table t2 select a from t1 union select c from t1;
+create table t2 select a from t1 union select b from t1;
+show columns from t2;
+drop table t2, t1;