Use cascading/maple to query hbase by specifying the row-id

[Pranav]

I am using the cascading/maple tap for hbase and I want to query by specifying the row-id. 

(defn hbase-tap [table-name key-field column-family & value-fields]

  (let [scheme (HBaseScheme. (w/fields key-field) column-family (w/fields value-fields))

        tap (HBaseTap. table-name scheme)]

    tap))

(defn to-string [bytes]

  (if (= nil bytes)

    ""

    (String. bytes)))

(defn trial-query

  []

  (let [h-table (hbase-tap "test" "row1" "cf" "a")]

    (?<- (stdout)

         [!l !l1]

         (h-table !name !temp)

         (to-string !name :> !l)

         (to-string !temp :> !l1))))

This query returns all rows which have columns 'cf:a'. I want cf:a only from row-id 'row1'. 

Could someone point to examples that accomplish this? Java examples are fine too. Thanks!

[Pranav]

bump. Alternatively, a way to get all columns from a column family for a row-id or even all data(all column families) for a row-id would be good.  

I tried using Fields/ALL to create the hbase tap like this - 

(HBaseScheme. (w/fields key-field) column-family Fields/ALL)

But this gives this error - 

cannot join fields if one is a substitution or is unknown

  [Thrown class cascading.tuple.TupleException]

Is there a way to do this?