Xiao Li created SPARK-15864:
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             Summary: Inconsistent Behaviors for Uncaching Non-cached Tables
                 Key: SPARK-15864
                 URL: https://issues.apache.org/jira/browse/SPARK-15864
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Xiao Li


To uncache a table, we have two different APIs. 
{{UNCACHE TABLE}} or {{spark.catalog.uncacheTable}}

When the table is not cached, the first way will report nothing. However, the 
second way will report a strange error message:
{{requirement failed: Table [a: int] is not cached}}





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