[jira] [Created] (SPARK-8010) Implict promote Numeric type to String type in HiveTypeCoercion

["Li Sheng (JIRA)" <ji...@apache.org>]

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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