MDEV-20589: Server still crashes in Field::set_warning_truncated_wrong_value

The flag is_stat_field is not set for the min_value and max_value of field items
inside table share. This is a must requirement as we don't want to throw
warnings of truncation when we read values from the statistics table to the column
statistics of table share fields.

1 files changed, 22 insertions, 0 deletions

diff --git a/mysql-test/t/stat_tables.test b/mysql-test/t/stat_tables.test
index 880e6378ca5..4c21e21ea70 100644
--- a/mysql-test/t/stat_tables.test
+++ b/mysql-test/t/stat_tables.test
@@ -546,5 +546,27 @@ set @@histogram_size= @save_histogram_size;
 set @@optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
 drop table t1;
 
+--echo #
+--echo # MDEV-20589: Server still crashes in Field::set_warning_truncated_wrong_value
+--echo #
+
+set names utf8;
+create table t1 ( a varchar(255) character set utf8);
+insert into t1 values (REPEAT('ӥ',255)), (REPEAT('ç',255));
+
+set use_stat_tables='preferably';
+analyze table t1 persistent for all;
+
+set @save_sql_mode= @@sql_mode;
+set sql_mode='ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
+update mysql.column_stats set min_value= REPEAT('ӥ',256) where db_name='test' and table_name='t1';
+set @@sql_mode= @save_sql_mode;
+
+select length(a) from t1 where a=REPEAT('ӥ',255);
+
+set names latin1;
+set @@use_stat_tables=@save_use_stat_tables;
+drop table t1;
+
 --echo # please keep this at the last
 set @@global.histogram_size=@save_histogram_size;