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From liming01 <...@git.apache.org>
Subject [GitHub] incubator-hawq pull request: HAWQ-273. Need re-fetch snapshot at p...
Date Fri, 25 Dec 2015 03:13:34 GMT
Github user liming01 commented on the pull request:

    https://github.com/apache/incubator-hawq/pull/211#issuecomment-167185478
  
    Yes, only 2 functions:
    - _SPI_prepare_plan():  you can find that before calling pg_plan_queries(), it already
fetch a new snapshot. And between them, it just some simple code, which is impossible to lock.
So we don't need to re-fetch one.  
    - exec_parse_message(): From the comment in the code, it just called for syntax check.
                     /**
    		 * Even though we do not store the plan, we want to perform planning
    		 * to know if SQL syntax is supported.
    		 */


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