Major Description
Union of map and other compatible column result in unresolved operator 'Union; exception
Reproduction
spark-sql>select map(1,2), 'str' union all select map(1,2,3,null), 1
Output:
Error in query: unresolved operator 'Union;;
'Union
:- Project map(1, 2) AS map(1, 2)#106, str AS str#107
: +- OneRowRelation$
+- Project map(1, cast(2 as int), 3, cast(null as int)) AS map(1, CAST(2 AS INT), 3, CAST(NULL AS INT))#109, 1 AS 1#108
+- OneRowRelation$
