Github user kavinderd commented on a diff in the pull request:

    https://github.com/apache/incubator-hawq/pull/915#discussion_r79740844
  
    --- Diff: src/backend/access/external/pxfheaders.c ---
    @@ -66,8 +66,13 @@ void build_http_header(PxfInputData *input)
        if (proj_info != NULL && proj_info->pi_isVarList)
        {
                List* qualsAttributes = extractPxfAttributes(input->quals);
    -
    -           add_projection_desc_httpheader(headers, proj_info, 
qualsAttributes);
    +           /* projection information is incomplete if columns from WHERE 
clause wasn't extracted */
    +           if (qualsAttributes !=  NIL || list_length(input->quals) == 0)
    --- End diff --
    
    Ok, got it


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