public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
    return visitor.visitExpression(this, context);
  }
Accessible for {@link ExpressionVisitor}, use {@link ExpressionVisitor#process} instead.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/expression/Expression.java