Julian Hyde created CALCITE-4552:
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             Summary: Interpreter does not close resources held by its Nodes on 
close
                 Key: CALCITE-4552
                 URL: https://issues.apache.org/jira/browse/CALCITE-4552
             Project: Calcite
          Issue Type: Bug
         Environment: When closing Interpreter, close resources held by its 
Nodes.

Currently, if a node is based on a JdbcTableScan, and the Interpreter's results 
have not been read to completion, the statement will still be open, and the 
JDBC connection will not be returned to the pool. This can cause a hang, 
waiting for a connection, if you allocate and deallocate lots of Interpreter 
instances.
            Reporter: Julian Hyde






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