LP:668290 - Wrong result in maria-5.3-mwl128 with join_cache_level = 4 and small join_buffer_size and join buffer (flat, BNLH join)

The following query:

SELECT t2 .col_int_key FROM t2 JOIN t1 ON t2 .col_varchar_10_latin1_key = t1 .col_varchar_10_utf8_key ;

returns no rows when executed with join_cache_level = 4, join_buffer_size = 164 , even though there are rows for which the condition t2 .col_varchar_10_latin1_key = t1 .col_varchar_10_utf8_key is TRUE.

The execution strategy is reported as "Using join buffer (flat, BNLH join)". maria-5.3 is not affected.