public int getRowCount() {
      return rowCount;
    }
Estimate input size based on filter and projection on table scan operator

@param remaining Early exit condition. If it has positive value, further estimation
                 can be canceled on the point of exceeding it. In this case,
                 return any bigger length value then this (Long.MAX_VALUE, for eaxmple).
ql/src/java/org/apache/hadoop/hive/ql/metadata/InputEstimator.java