[jira] [Created] (SPARK-8752) Add ExpectsInputTypes trait for defining expected input types.

[Reynold Xin (JIRA)]

Reynold Xin created SPARK-8752:
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             Summary: Add ExpectsInputTypes trait for defining expected input 
types.
                 Key: SPARK-8752
                 URL: https://issues.apache.org/jira/browse/SPARK-8752
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
            Reporter: Reynold Xin
            Assignee: Reynold Xin






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