alter_table.result, alter_table.test, field_conv.cc:

  Bug #6479  ALTER TABLE ... changing charset fails for TEXT columns
  Fix: use do_conv_blob rather than do_copy_blob
  if the column's character sets are different.


sql/field_conv.cc:
  Bug #6479  ALTER TABLE ... changing charset fails for TEXT columns
  Fix: use do_conv_blob rather than do_copy_blob
  if the column's character sets are different.
mysql-test/t/alter_table.test:
  Bug #6479  ALTER TABLE ... changing charset fails for TEXT columns
  Fix: use do_conv_blob rather than do_copy_blob
  if the column's character sets are different.
mysql-test/r/alter_table.result:
  Bug #6479  ALTER TABLE ... changing charset fails for TEXT columns
  Fix: use do_conv_blob rather than do_copy_blob
  if the column's character sets are different.

1 files changed, 12 insertions, 0 deletions

diff --git a/mysql-test/t/alter_table.test b/mysql-test/t/alter_table.test
index e46027ae8d9..66a4adc90fe 100644
--- a/mysql-test/t/alter_table.test
+++ b/mysql-test/t/alter_table.test
@@ -324,3 +324,15 @@ alter table t1 rename to `t1\\`;
 rename table t1 to `t1\\`;
 drop table t1;
 
+#
+# Bug #6479  ALTER TABLE ... changing charset fails for TEXT columns
+#
+# The column's character set was changed but the actual data was not
+# modified. In other words, the values were reinterpreted
+# as UTF8 instead of being converted.
+create table t1 (a text) character set koi8r;
+insert into t1 values (_koi8r'ΤΕΣΤ');
+select hex(a) from t1;
+alter table t1 convert to character set cp1251;
+select hex(a) from t1;
+drop table t1;