SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Literal UInt64_3
      Function count (children 1)
       ExpressionList
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias s1) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Function toLowCardinality (alias l) (children 1)
            ExpressionList (children 1)
             Function toNullable (children 1)
              ExpressionList (children 1)
               Identifier number
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.numbers
          Literal UInt64_3
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias s2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Function toLowCardinality (alias r) (children 1)
            ExpressionList (children 1)
             Function toNullable (children 1)
              ExpressionList (children 1)
               Identifier number
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.numbers
          Literal UInt64_4
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier l
        Identifier r
