bk commit into 4.1 tree (ramil:1.2532) BUG#20709

[ramil]

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4.1 repository of ram. When ram does a push these changes will
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ChangeSet@stripped, 2006-08-10 15:06:22+05:00, ramil@stripped +3 -0
  Fix for bug #20709: Collation not used in group by on 4.1.    
  
  myisam/mi_uniue.c:mi_check_unique() should skip trailing spaces comparing 
  TEXT and VARTTEXT key segments.

  myisam/mi_unique.c@stripped, 2006-08-10 15:06:20+05:00, ramil@stripped +1 -1
    Fix for bug #20709: Collation not used in group by on 4.1.    
    
    myisam/mi_uniue.c:mi_check_unique() should skip trailing spaces comparing 
    TEXT and VARTTEXT key segments.
      
    Example: assume, we have a 'char(200) collate utf8_unicode_ci' field,
    there are two records with _utf8"0x65" and _utf8"0xC3A9" characters;
    these values are equal according
    to the utf8_unicode_ci collation, but two 600 byte length corresponding keys:  
    "0x65<0x20 repeats 599 times>" and "0xC3A9<0x20 repeats 598 times>" are
not    
    equal if we count trailing spaces and it may cause inconsequent behavior.
    
    So, let's pass 1 as the skip_end_space parameter value to the mi_compare_text()
    function for proper TEXT and VARTTEXT key segments comparison.

  mysql-test/r/ctype_utf8.result@stripped, 2006-08-10 15:06:20+05:00, ramil@stripped +16 -0
    Fix for bug #20709: Collation not used in group by on 4.1.    
      - test results.

  mysql-test/t/ctype_utf8.test@stripped, 2006-08-10 15:06:20+05:00, ramil@stripped +14 -0
    Fix for bug #20709: Collation not used in group by on 4.1.    
      - test case.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	ramil
# Host:	myoffice.izhnet.ru
# Root:	/usr/home/ram/work/4.1.b20709

--- 1.21/myisam/mi_unique.c	2006-08-10 15:06:27 +05:00
+++ 1.22/myisam/mi_unique.c	2006-08-10 15:06:27 +05:00
@@ -185,7 +185,7 @@
     if (type == HA_KEYTYPE_TEXT || type == HA_KEYTYPE_VARTEXT)
     {
       if (mi_compare_text(keyseg->charset, (uchar *) pos_a, length,
-                                           (uchar *) pos_b, length, 0, 0))
+                                           (uchar *) pos_b, length, 0, 1))
 	  return 1;
     }
     else

--- 1.73/mysql-test/r/ctype_utf8.result	2006-08-10 15:06:27 +05:00
+++ 1.74/mysql-test/r/ctype_utf8.result	2006-08-10 15:06:27 +05:00
@@ -1293,3 +1293,19 @@
 42749	72	VOLNÝ ADSL
 44205	72	VOLNÝ ADSL
 DROP TABLE t1;
+create table t1(a char(200) collate utf8_unicode_ci NOT NULL default '')
+default charset=utf8 collate=utf8_unicode_ci;
+insert into t1 values (unhex('65')), (unhex('C3A9')), (unhex('65'));
+explain select distinct a from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using temporary
+select distinct a from t1;
+a
+e
+explain select a from t1 group by a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using temporary; Using filesort
+select a from t1 group by a;
+a
+e
+drop table t1;

--- 1.75/mysql-test/t/ctype_utf8.test	2006-08-10 15:06:27 +05:00
+++ 1.76/mysql-test/t/ctype_utf8.test	2006-08-10 15:06:27 +05:00
@@ -1040,4 +1040,18 @@
 SELECT * FROM t1 WHERE tid=72 and val LIKE 'VOLNÝ ADSL'; 
 
 DROP TABLE t1;
+
+#
+# Bug 20709: problem with utf8 fields in temporary tables
+#
+
+create table t1(a char(200) collate utf8_unicode_ci NOT NULL default '')
+  default charset=utf8 collate=utf8_unicode_ci;
+insert into t1 values (unhex('65')), (unhex('C3A9')), (unhex('65'));
+explain select distinct a from t1;
+select distinct a from t1;
+explain select a from t1 group by a;
+select a from t1 group by a;
+drop table t1;
+
 # End of 4.1 tests