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From:gluh Date:October 29 2007 10:53am
Subject:bk commit into 5.0 tree (gluh:1.2555) BUG#30897
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Below is the list of changes that have just been committed into a local
5.0 repository of gluh. When gluh does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet@stripped, 2007-10-29 14:53:10+04:00, gluh@stripped +3 -0
  Bug#30897 GROUP_CONCAT returns extra comma on empty fields
  The fix is a copy of Martin Friebe's suggestion.
  added testing for no_appended which will be false if anything,
  including the empty string is in result

  mysql-test/r/func_gconcat.result@stripped, 2007-10-29 14:53:09+04:00, gluh@stripped +9 -0
    test result

  mysql-test/t/func_gconcat.test@stripped, 2007-10-29 14:53:09+04:00, gluh@stripped +9 -0
    test case

  sql/item_sum.cc@stripped, 2007-10-29 14:53:09+04:00, gluh@stripped +1 -1
    added testing for no_appended which will be False if anything,
    including the empty string is in result

diff -Nrup a/mysql-test/r/func_gconcat.result b/mysql-test/r/func_gconcat.result
--- a/mysql-test/r/func_gconcat.result	2007-10-11 17:20:32 +05:00
+++ b/mysql-test/r/func_gconcat.result	2007-10-29 14:53:09 +04:00
@@ -861,4 +861,13 @@ select group_concat(distinct a, c order 
 group_concat(distinct a, c order by a desc, c desc)
 31,11,10,01,00
 drop table t1;
+create table t1 (f1 char(20));
+insert into t1 values (''),('');
+select group_concat(distinct f1) from t1;
+group_concat(distinct f1)
+
+select group_concat(f1) from t1;
+group_concat(f1)
+,
+drop table t1;
 End of 5.0 tests
diff -Nrup a/mysql-test/t/func_gconcat.test b/mysql-test/t/func_gconcat.test
--- a/mysql-test/t/func_gconcat.test	2007-10-11 17:20:32 +05:00
+++ b/mysql-test/t/func_gconcat.test	2007-10-29 14:53:09 +04:00
@@ -590,4 +590,13 @@ select group_concat(distinct a, c order 
 drop table t1;
 
 
+#
+# Bug#30897 GROUP_CONCAT returns extra comma on empty fields
+#
+create table t1 (f1 char(20));
+insert into t1 values (''),('');
+select group_concat(distinct f1) from t1;
+select group_concat(f1) from t1;
+drop table t1;
+
 --echo End of 5.0 tests
diff -Nrup a/sql/item_sum.cc b/sql/item_sum.cc
--- a/sql/item_sum.cc	2007-10-23 18:48:55 +05:00
+++ b/sql/item_sum.cc	2007-10-29 14:53:09 +04:00
@@ -3406,7 +3406,7 @@ String* Item_func_group_concat::val_str(
   DBUG_ASSERT(fixed == 1);
   if (null_value)
     return 0;
-  if (!result.length() && tree)
+  if (no_appended && tree)
     /* Tree is used for sorting as in ORDER BY */
     tree_walk(tree, (tree_walk_action)&dump_leaf_key, (void*)this,
               left_root_right);
Thread
bk commit into 5.0 tree (gluh:1.2555) BUG#30897gluh29 Oct