Ivan Leskin created HAWQ-1605:
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             Summary: Support INSERT in PXF JDBC plugin
                 Key: HAWQ-1605
                 URL: https://issues.apache.org/jira/browse/HAWQ-1605
             Project: Apache HAWQ
          Issue Type: Improvement
          Components: PXF
            Reporter: Ivan Leskin
            Assignee: Ed Espino


Add support of INSERT queries in PXF JDBC plugin:
 * Implement `WriteAccessor` and `WriteResolver` interfaces. Both are 
implemented in the same classes as `ReadAccessor` and `ReadResolver`;
 * Support query batching in Accessor. The size of a batch is defined by user 
and may be "infinite";
 * In Accessor, use `java.sql.PreparedStatement` and built-in functions in it 
to process queries;
 * In `setFields()` method of Resolver, perform type conversions of the data 
tuples received from PXF.

Optimize and refactor the code in PXF JDBC plugin, make some fixes:
 * Make functions for building WHERE statements static where possible to reduce 
the number of InputData checks;
 * Organize imports;
 * Check the codestyle;
 * Fix the handling of TIMESTAMP values when performing SELECT requests.

Improve documentation:
 * Correct or rewrite Javadoc strings for plugin functions;
 * Rewrite README.md.



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