Jason Dere created HIVE-5825:
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Summary: Case statement type checking too restrictive for
parameterized types
Key: HIVE-5825
URL: https://issues.apache.org/jira/browse/HIVE-5825
Project: Hive
Issue Type: Bug
Components: UDF
Reporter: Jason Dere
Assignee: Jason Dere
explain select
case when (key = '0') then 123.456BD else 0.0BD end
from src limit 2
FAILED: SemanticException [Error 10016]: Line 3:44 Argument type mismatch
'0.0BD': The expression after ELSE should have the same type as those after
THEN: "decimal(6,3)" is expected but "decimal(1,0)" is found
The return type checking is too strict and won't allow different decimal types
to be returned if they are not the exact same type (precision/scale). There
are similar issues with char/varchar length, but even in the general case it
seems odd that you wouldn't be able to specify 1 and 0.0 in the same case
statement.
I would propose setting returnOIResolver so that it is able to convert the
return values to common type.
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