Fix for bug #31154: field.h:1649: virtual int Field_bit::cmp(const uchar*, const uchar*): Assertion

Problem: GROUP_CONCAT(DISTINCT BIT_FIELD...) uses a tree to store keys;
which are constructed using a temporary table fields,
see Item_func_group_concat::setup().
As a) we don't store null bits in the tree where the bit fields store parts 
of their data and b) there's no method to properly compare two table records
we've got problem.

Fix: convert BIT fields to INT in the temporary table used.


mysql-test/r/func_gconcat.result:
  Fix for bug #31154: field.h:1649: virtual int Field_bit::cmp(const uchar*, const uchar*): Assertion
    - test result.
mysql-test/t/func_gconcat.test:
  Fix for bug #31154: field.h:1649: virtual int Field_bit::cmp(const uchar*, const uchar*): Assertion
    - test case.
sql/item_sum.cc:
  Fix for bug #31154: field.h:1649: virtual int Field_bit::cmp(const uchar*, const uchar*): Assertion
    - force the create_tmp_table() to convert BIT columns to INT 
      in order to be able to compare records containing BIT fields.

1 files changed, 28 insertions, 0 deletions

diff --git a/mysql-test/t/func_gconcat.test b/mysql-test/t/func_gconcat.test
index ff3ba951870..c415ca6c6eb 100644
--- a/mysql-test/t/func_gconcat.test
+++ b/mysql-test/t/func_gconcat.test
@@ -562,4 +562,32 @@ insert into t1 (id, name) values (2, "óra");
 select b.id, group_concat(b.name) from t1 a, t1 b group by b.id;
 drop table t1;
 
+#
+# Bug #31154: group_concat() and bit fields;
+#
+create table t1(a bit not null);
+insert into t1 values (), (), ();
+select group_concat(distinct a) from t1;
+select group_concat(distinct a order by a) from t1;
+drop table t1;
+
+create table t1(a bit(2) not null);
+insert into t1 values (1), (0), (0), (3), (1);
+select group_concat(distinct a) from t1;
+select group_concat(distinct a order by a) from t1;
+select group_concat(distinct a order by a desc) from t1;
+drop table t1;
+
+create table t1(a bit(2), b varchar(10), c bit);
+insert into t1 values (1, 'a', 0), (0, 'b', 1), (0, 'c', 0), (3, 'd', 1),
+(1, 'e', 1), (3, 'f', 1), (0, 'g', 1);
+select group_concat(distinct a, c) from t1;
+select group_concat(distinct a, c order by a) from t1;
+select group_concat(distinct a, c) from t1;
+select group_concat(distinct a, c order by a, c) from t1;
+select group_concat(distinct a, c order by a desc, c desc) from t1;
+
+drop table t1;
+
+
 --echo End of 5.0 tests