Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Literal UInt64_1
    Function in (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Subquery (alias subquery) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function arrayJoin (children 1)
            ExpressionList (children 1)
             Literal Array_[UInt64_1, UInt64_2, UInt64_3]