Fixed bug mdev-3866.

The invalid implementation of the method Field_bit::cmp_max could
trigger a valgrind complain or could lead to incorrect statistical
data when collecting engine-independent statistics on BIT fields.

2 files changed, 29 insertions, 0 deletions

diff --git a/mysql-test/r/stat_tables_partition.result b/mysql-test/r/stat_tables_partition.result
new file mode 100644
index 00000000000..75454b61fe0
--- /dev/null
+++ b/mysql-test/r/stat_tables_partition.result
@@ -0,0 +1,12 @@
+#
+# Bug mdev-3866: valgrind complain from ANALYZE on a table with BIT field
+# 
+SET use_stat_tables = 'preferably';
+CREATE TABLE t1 (pk int PRIMARY KEY, a bit(1), INDEX idx(a)
+) ENGINE=MyISAM PARTITION BY KEY(pk) PARTITIONS 2;
+INSERT INTO t1 VALUES (1,1),(2,0),(3,0),(4,1);
+ANALYZE TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	OK
+SET use_stat_tables = DEFAULT;
+DROP TABLE t1;
diff --git a/mysql-test/t/stat_tables_partition.test b/mysql-test/t/stat_tables_partition.test
new file mode 100644
index 00000000000..1316e5cca11
--- /dev/null
+++ b/mysql-test/t/stat_tables_partition.test
@@ -0,0 +1,17 @@
+--source include/have_partition.inc
+
+--echo #
+--echo # Bug mdev-3866: valgrind complain from ANALYZE on a table with BIT field
+--echo # 
+
+SET use_stat_tables = 'preferably';
+
+CREATE TABLE t1 (pk int PRIMARY KEY, a bit(1), INDEX idx(a)
+) ENGINE=MyISAM PARTITION BY KEY(pk) PARTITIONS 2;
+INSERT INTO t1 VALUES (1,1),(2,0),(3,0),(4,1);
+
+ANALYZE TABLE t1;
+
+SET use_stat_tables = DEFAULT;
+
+DROP TABLE t1;