Github user paul-guo- commented on a diff in the pull request:

    https://github.com/apache/incubator-hawq/pull/1243#discussion_r117418080
  
    --- Diff: src/backend/executor/nodeMaterial.c ---
    @@ -759,3 +764,30 @@ ExecEagerFreeMaterial(MaterialState *node)
        }
     }
     
    +
    +/*
    + * mkTempFileForWriter
    + * 
    + * Create a unique tmp file for writer. Then use flock's unblock way to 
lock the tmp file.
    + * We can make sure the tmp file will be locked forerver until the writer 
process has quit.
    + */
    +void mkTempFileForWriter(int size, int share_id, char * name)
    +{
    +   char *tmp_file;
    +   int lock;
    +
    +   tmp_file = (char *)palloc(sizeof(char) * MAXPGPATH);
    +   mk_tmp_file_name(tmp_file, size, share_id, name);
    +   elog(DEBUG3, "tmp file for writer is %s", tmp_file);
    --- End diff --
    
    I think "shareinputscan" should be added in the log.


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