Li Sheng created SPARK-8010:
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Summary: Implict promote Numeric type to String type in
HiveTypeCoercion
Key: SPARK-8010
URL: https://issues.apache.org/jira/browse/SPARK-8010
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.3.1
Reporter: Li Sheng
Fix For: 1.3.1
1. Given a query
`select coalesce(null, 1, '1') from dual` will cause exception:
java.lang.RuntimeException: Could not determine return type of Coalesce for
IntegerType,StringType
2. Given a query:
`select case when true then 1 else '1' end from dual` will cause exception:
java.lang.RuntimeException: Types in CASE WHEN must be the same or coercible
to a common type: StringType != IntegerType
I checked the code, the main cause is the HiveTypeCoercion doesn't do implicit
convert when there is a IntegerType and StringType.
Numeric types can be promoted to string type in case throw exceptions.
Since Hive will always do this. It need to be fixed.
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