Analysis error: IllegalArgumentException: targetType=SMALLINT type=INT

[home:21000] > use functional;
Query: use functional

[home:21000] > explain SELECT 1
FROM alltypestiny a1
INNER JOIN alltypestiny a3 ON a3.smallint_col = a1.int_col
INNER JOIN alltypes a4 ON a4.smallint_col = a3.smallint_col;
Query: explain SELECT 1
FROM alltypestiny a1
INNER JOIN alltypestiny a3 ON a3.smallint_col = a1.int_col
INNER JOIN alltypes a4 ON a4.smallint_col = a3.smallint_col
ERROR: IllegalStateException: Failed analysis after expr substitution.
CAUSED BY: IllegalArgumentException: targetType=SMALLINT type=INT