@Override
    protected Boolean visitArithmeticBinary(ArithmeticBinaryExpression node, Void context) {
      return process(node.getLeft(), context) && process(node.getRight(), context);
    }
visitor returns true if all expressions are constant with respect to the group.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/analyzer/AggregationAnalyzer.java