parquet-column/src/main/java/org/apache/parquet/column/impl/ColumnWriterBase.java
@Override
  public void writeNull(int repetitionLevel, int definitionLevel) {
    if (DEBUG)
      log(null, repetitionLevel, definitionLevel);
    repetitionLevel(repetitionLevel);
    definitionLevel(definitionLevel);
    statistics.incrementNumNulls();
    ++valueCount;
  }
@Override
  public void writeNull(int repetitionLevel, int definitionLevel) {
    if (DEBUG)
      log(null, repetitionLevel, definitionLevel);
    repetitionLevel(repetitionLevel);
    definitionLevel(definitionLevel);
    statistics.incrementNumNulls();
    ++valueCount;
  }
Writes the current null value

@param repetitionLevel
@param definitionLevel