LP:672551 - Less rows returned with (flat, BNLH join) in maria-5.3-mwl128

The following query:

SELECT table2.col_int FROM t1 AS table1 JOIN t2 AS table2 ON table1.col_varchar_1024_latin1_key = table2.col_varchar_1024_latin1_key ;

Returns one NULL row when executed with BNLH and 2 rows when executed with no indexes and full table scans.