Fixed bug mdev-9628.

In the function create_key_parts_for_pseudo_indexes()
the key part structures of pseudo-indexes created for
BLOB fields were set incorrectly.
Also the key parts for long fields must be 'truncated'
up to the maximum length acceptable for key parts.

1 files changed, 33 insertions, 0 deletions

diff --git a/mysql-test/t/selectivity.test b/mysql-test/t/selectivity.test
index 1321046009e..8efc5216ba0 100644
--- a/mysql-test/t/selectivity.test
+++ b/mysql-test/t/selectivity.test
@@ -992,3 +992,36 @@ drop table t1;
 set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
 set use_stat_tables=@save_use_stat_tables;
 
+--echo #
+--echo # Bug mdev-9628: unindexed blob column without min-max statistics 
+--echo #                with optimizer_use_condition_selectivity=3
+--echo #
+
+set use_stat_tables='preferably';
+set optimizer_use_condition_selectivity=3;
+
+create table t1(col1 char(32));
+insert into t1 values ('a'),('b'),('c'),('d'), ('e'),('f'),('g'),('h');
+analyze table t1;
+
+create table t2(col1 text);
+insert into t2 values ('a'),('b'),('c'),('d'), ('e'),('f'),('g'),('h');
+analyze table t2;
+
+select * from t1 where col1 > 'b' and col1 < 'd';
+explain extended 
+select * from t1 where col1 > 'b' and col1 < 'd';
+
+select * from t2 where col1 > 'b' and col1 < 'd';
+explain extended 
+select * from t2 where col1 > 'b' and col1 < 'd';
+
+select * from t2 where col1 < 'b' and col1 > 'd';
+explain extended 
+select * from t2 where col1 < 'b' and col1 > 'd';
+
+drop table t1,t2;
+
+set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
+set use_stat_tables=@save_use_stat_tables;
+