bug 283: FULLTEXT index on a TEXT filed converted to a CHAR field doesn't work anymore

mysql-test/r/fulltext.result

@@ -215,3 +215,14 @@ test.t1	repair	status	OK
 select * from t1 where match (a) against ('aaaa');
 a
 drop table t1;
+drop table if exists t1;
+create table t1 ( ref_mag text not null, fulltext (ref_mag));
+insert into t1 values ('test');
+select ref_mag from t1 where match ref_mag against ('+test' in boolean mode);
+ref_mag
+test
+alter table t1 change ref_mag ref_mag char (255) not null;
+select ref_mag from t1 where match ref_mag against ('+test' in boolean mode);
+ref_mag
+test
+drop table t1;

mysql-test/t/fulltext.test

@@ -173,3 +173,16 @@ repair table t1;
 select * from t1 where match (a) against ('aaaa');
 drop table t1;
 
+#
+# bug 283 by jocelyn fournier <joc@presence-pc.com>
+# FULLTEXT index on a TEXT filed converted to a CHAR field doesn't work anymore
+# 
+
+drop table if exists t1;
+create table t1 ( ref_mag text not null, fulltext (ref_mag));
+insert into t1 values ('test');
+select ref_mag from t1 where match ref_mag against ('+test' in boolean mode);
+alter table t1 change ref_mag ref_mag char (255) not null;
+select ref_mag from t1 where match ref_mag against ('+test' in boolean mode);
+drop table t1;
+

sql/sql_table.cc

@@ -569,6 +569,14 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
 			column->field_name);
 	DBUG_RETURN(-1);
       }
+      /* for fulltext keys keyseg length is 1 for blobs (it's ignored in
+         ft code anyway, and 0 (set to column width later) for char's.
+         it has to be correct col width for char's, as char data are not
+         prefixed with length (unlike blobs, where ft code takes data length
+         from a data prefix, ignoring column->length).
+      */
+      if (key->type == Key::FULLTEXT)
+        column->length=test(f_is_blob(sql_field->pack_flag));
       if (f_is_blob(sql_field->pack_flag))
       {
 	if (!(file->table_flags() & HA_BLOB_KEY))
@@ -578,10 +586,6 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
 	  DBUG_RETURN(-1);
 	}
 	if (!column->length)
-	{
-          if (key->type == Key::FULLTEXT)
-            column->length=1; /* ft-code ignores it anyway :-) */
-          else
 	{
           my_printf_error(ER_BLOB_KEY_WITHOUT_LENGTH,
                           ER(ER_BLOB_KEY_WITHOUT_LENGTH),MYF(0),
@@ -589,7 +593,6 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
           DBUG_RETURN(-1);
 	}
       }
-      }
       if (!(sql_field->flags & NOT_NULL_FLAG))
       {
 	if (key->type == Key::PRIMARY)