public static void serialize(ViewExpression expression, OutputStream stream) throws IOException {
    ReadWriteIOUtils.write(expression.getExpressionType().getExpressionTypeInShortEnum(), stream);

    expression.serialize(stream);
  }
@return if this view expression could be a source for an ALIAS series (one kind of view),
    return true; else return false. Foe example, a SINGLE TimeSeriesOperand could be a source
    for an alias view.
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/schema/view/viewExpression/ViewExpression.java