[jira] [Created] (SPARK-9264) When dealing with Union/Intersect/Except, we cast FloatType/DoubleType to the wrong DecimalType

["Yin Huai (JIRA)" <ji...@apache.org>]

Yin Huai created SPARK-9264:
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             Summary: When dealing with Union/Intersect/Except, we cast FloatType/DoubleType to the wrong DecimalType
                 Key: SPARK-9264
                 URL: https://issues.apache.org/jira/browse/SPARK-9264
             Project: Spark
          Issue Type: Sub-task
    Affects Versions: 1.4.0
            Reporter: Yin Huai
            Priority: Blocker


The problem is https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala#L361-L362. When we union/intersect/except, for a column, if the data type of it in one table is a fixed precision decimal type and that in another table is a FloatType/DoubleType, we cast FloatType to Decimal(7, 7) and cast DoubleType to Decimal(15, 15), respectively. It is wrong.



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