Julian Hyde created CALCITE-1416:
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             Summary: Make classes implement AutoCloseable where possible
                 Key: CALCITE-1416
                 URL: https://issues.apache.org/jira/browse/CALCITE-1416
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


If a class has a close method, make it implement {{AutoCloseable}}, so it can 
be used in try-with-resources. Some possible classes (they have a {{close}} 
method):
* org.apache.calcite.tools.Planner
* org.apache.calcite.interpreter.Interpreter
* org.apache.calcite.interpreter.Source
* Hook.Closeable (we can ditch JDK 1.6 support)
* SqlTesterImpl




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