Using EQUALS in a WHERE clause on a specific column returns no results

We have a breaking issue with Columnstore. It was working fine earlier today but all the sudden, queries that are executed using equals in the code column are returning 0 results. Here is one of the query examples showing the issue:

MariaDB [AAA]> SELECT ANI_Digits,Call_Date,Call_Direction,DATE_FORMAT( '2008-12-31 ' + INTERVAL Call_Duration SECOND, '%H:%i:%s' ) as Call_Duration,ROUND( ( Call_Duration / 60.0) , 2 ) AS Minutes, Call_Time,Dialed_Digits,Extension,HSITE,ITrun,Location_Code,NPA,NXX,Outgoing_Trunk,code FROM foo WHERE Call_Date BETWEEN '2019-04-10 12:00:00' AND '2019-04-12 12:18:00' LIMIT 5;
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ANI_Digits Call_Date Call_Direction Call_Duration Minutes Call_Time Dialed_Digits Extension HSITE ITrun Location_Code NPA NXX Outgoing_Trunk code
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NULL 2019-04-11 12:04:56 Outbound 00:00:04 0.07 12:04:56 4213004 2333410 _fl NULL FAH NULL NULL 8850 nnn
NULL 2019-04-11 12:04:56 Outbound 00:00:04 0.07 12:04:56 4213004 4213265 _fl NULL FAH NULL NULL 8850 yyy
2019-04-11 12:05:00 Incoming 00:00:00 0.00 12:05:00 NULL 8850 _fl 6767 FAH NULL NULL NULL NULL
2019-04-11 12:05:00 Incoming 00:00:00 0.00 12:05:00 NULL 8850 _fl 8850 FAH NULL NULL NULL NULL
2019-04-11 12:05:03 Incoming 00:00:57 0.95 12:05:03 NULL 4203706 _fl 6888 FAH NULL NULL NULL vvv
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notice that 3 records contain a value in the code field. When I include the code condition in the query, I get nothing:

MariaDB [AAA]> SELECT ANI_Digits,Call_Date,Call_Direction,DATE_FORMAT( '2008-12-31 ' + INTERVAL Call_Duration SECOND, '%H:%i:%s' ) as Call_Duration,ROUND( ( Call_Duration / 60.0) , 2 ) AS Minutes, Call_Time,Dialed_Digits,Extension,HSITE,ITrun,Location_Code,NPA,NXX,Outgoing_Trunk,code FROM foo WHERE Call_Date BETWEEN '2019-04-10 12:00:00' AND '2019-04-12 12:18:00' AND code='yyy' LIMIT 5;

Empty set (0.011 sec)

I confirmed that there are no extra spaces in the value. Whats odd is it does return results if I use LIKE with no wild cards:

MariaDB [AAA]> SELECT ANI_Digits,Call_Date,Call_Direction,DATE_FORMAT( '2008-12-31 ' + INTERVAL Call_Duration SECOND, '%H:%i:%s' ) as Call_Duration,ROUND( ( Call_Duration / 60.0) , 2 ) AS Minutes, Call_Time,Dialed_Digits,Extension,HSITE,ITrun,Location_Code,NPA,NXX,Outgoing_Trunk,code FROM foo WHERE Call_Date BETWEEN '2019-04-10 12:00:00' AND '2019-04-12 12:18:00' AND code LIKE 'yyy' LIMIT 5;
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ANI_Digits Call_Date Call_Direction Call_Duration Minutes Call_Time Dialed_Digits Extension HSITE ITrun Location_Code NPA NXX Outgoing_Trunk code
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NULL 2019-04-11 12:04:56 Outbound 00:00:04 0.07 12:04:56 4213004 4213265 _fl NULL FAH NULL NULL 8850 yyy
NULL 2019-04-11 12:05:24 Outbound 00:00:36 0.60 12:05:24 4213004 4213004 _fl NULL FAH NULL NULL 8850 yyy
2019-04-11 12:05:33 Incoming 00:00:27 0.45 12:05:33 NULL 4214179 _fl 6888 FAH NULL NULL NULL yyy
2019-04-11 12:05:46 Incoming 00:00:14 0.23 12:05:46 NULL 4215923 _fl 6888 FAH NULL NULL NULL yyy
7172151364 2019-04-11 12:05:54 Incoming 00:05:06 5.10 12:05:54 NULL 4213439 _fl 6767 FAH NULL NULL NULL yyy
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5 rows in set (0.077 sec)

I was able to reproduce with the prcedure provided by the customer in the Case.

MariaDB [foo]> LOAD DATA INFILE 'foo_data'
-> INTO TABLE foo
-> FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
-> LINES TERMINATED BY '\n';
Query OK, 7001 rows affected (2.364 sec)

Records: 7001 Deleted: 0 Skipped: 0 Warnings: 0

MariaDB [foo]> SELECT code FROM foo WHERE code LIKE 'yyy' LIMIT 1;
-----------
code
-----------
yyy
-----------
1 row in set (0.106 sec)

MariaDB [foo]> SELECT code FROM foo WHERE code = 'yyy' LIMIT 1;
Empty set (0.007 sec)
MariaDB [foo]>