bk commit into 4.1 tree (evgen:1.2380) BUG#12266

[eugene]

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4.1 repository of evgen. When evgen does a push these changes will
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ChangeSet
  1.2380 05/08/04 18:05:33 evgen@stripped +3 -0
  Fix bug#12266 GROUP BY DATE(LEFT(column,8)) returns result strings with reduced
  length.
  
  When temporary field created for DATE(LEFT(column,8)) expression, max_length
  value is taken from Item_date_typecast, and it is getting it from underlaid
  Item_func_left and it's max_length is 8 in given expression. And all this
  results in stripping last 2 digits.
  
  To Item_date_typecast class added its own fix_length_and_dec() function 
  that sets max_length value to 10, which is proper for DATE field.

  sql/item_timefunc.h
    1.53 05/08/04 17:50:37 evgen@stripped +6 -0
    Fix bug#12266 GROUP BY DATE(LEFT(column,8)) returns result strings with reduced length.
    To Item_date_typecast class added its own fix_length_and_dec() which sets proper max_length value.

  mysql-test/r/group_by.result
    1.51 05/08/04 17:42:24 evgen@stripped +7 -0
    Test case for bug#12266 GROUP BY DATE(LEFT(column,8)) returns result strings with reduced length.

  mysql-test/t/group_by.test
    1.42 05/08/04 17:39:35 evgen@stripped +10 -0
    Test case for bug#12266 GROUP BY DATE(LEFT(column,8)) returns result strings with reduced length.

# 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:	evgen
# Host:	moonbone.local
# Root:	/work/mysql-4.1-bug-12266

--- 1.52/sql/item_timefunc.h	2005-05-04 17:05:53 +04:00
+++ 1.53/sql/item_timefunc.h	2005-08-04 17:50:37 +04:00
@@ -709,6 +709,12 @@
   {
     return (new Field_date(maybe_null, name, t_arg, &my_charset_bin));
   }  
+  void fix_length_and_dec()
+  {
+    collation.set(&my_charset_bin);
+    max_length= 10;
+    maybe_null= 1;
+  }
 };
 
 

--- 1.50/mysql-test/r/group_by.result	2005-06-28 14:17:15 +04:00
+++ 1.51/mysql-test/r/group_by.result	2005-08-04 17:42:24 +04:00
@@ -757,3 +757,10 @@
 n
 2
 DROP TABLE t1;
+create table t1 (f1 date);
+insert into t1 values('2005-06-06');
+insert into t1 values('2005-06-06');
+select date(left(f1+0,8)) from t1 group by 1;
+date(left(f1+0,8))
[phone]
+drop table t1;

--- 1.41/mysql-test/t/group_by.test	2005-07-28 04:21:42 +04:00
+++ 1.42/mysql-test/t/group_by.test	2005-08-04 17:39:35 +04:00
@@ -590,4 +590,14 @@
 SELECT n+1 AS n FROM t1 GROUP BY n;
 DROP TABLE t1;
 
+#
+# Bug #12266 GROUP BY expression on DATE column produces result with
+#            reduced length
+#
+create table t1 (f1 date);
+insert into t1 values('2005-06-06');
+insert into t1 values('2005-06-06'); 
+select date(left(f1+0,8)) from t1 group by 1;
+drop table t1;
+
 # End of 4.1 tests