Ming LI created HAWQ-1000:
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Summary: Set dummy workfile pointer to NULL after calling
ExecWorkFile_Close()
Key: HAWQ-1000
URL: https://issues.apache.org/jira/browse/HAWQ-1000
Project: Apache HAWQ
Issue Type: Bug
Reporter: Ming LI
Assignee: Lei Chang
The parameter workfile for ExecWorkFile_Close() is freed in this function, but
in the calling function outside, the pointer variable still exists, we need to
set it to NULL pointer immediately, otherwise it will use some freed pointer
afterward.
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