[jira] [Created] (HAWQ-1603) add new hook api for expressions

[zhangshujie (JIRA)]

zhangshujie created HAWQ-1603:
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             Summary: add new hook api for expressions
                 Key: HAWQ-1603
                 URL: https://issues.apache.org/jira/browse/HAWQ-1603
             Project: Apache HAWQ
          Issue Type: Sub-task
          Components: Query Execution
            Reporter: zhangshujie
            Assignee: Lei Chang
             Fix For: backlog


1.add new hook API for expressions

2.add new hook API for refactoring the plan tree



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