Github user shivzone commented on a diff in the pull request:
    --- Diff: 
pxf/pxf-api/src/main/java/org/apache/hawq/pxf/api/ ---
    @@ -220,6 +193,24 @@ public Object parse(String filter) throws Exception {
                         // Store result on stack
    +                case 'l':
    +                    LogicalOperation logicalOperation = 
    +                    if (logicalOperation == null) {
    +                        throw new FilterStringSyntaxException("unknown op 
ending at " + index);
    +                    }
    +                    if (logicalOperation == LogicalOperation.HDOP_NOT) {
    +                        Object exp = operandsStack.pop();
    +                        result =, 
    +                    } else {
    --- End diff --
    might be good to explicitly check for enum values here just in case we add 
support for more logical operations. If not atleast add a comment here about 
the logical operations being handled in this case

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