gets the constant value of the specified field . if the field is a group field , then its value can be obtained from the saved group value . otherwise , the value is obtained from the appropriate aggregation function . concode_field_sep Scan s concode_elem_sep boolean moregroups concode_elem_sep Collection<String> groupfields concode_elem_sep Collection<AggregationFn> aggfns concode_elem_sep GroupValue groupval concode_field_sep boolean next concode_elem_sep int getInt concode_elem_sep void beforeFirst concode_elem_sep String getString concode_elem_sep void close concode_elem_sep boolean hasField