SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function substr (alias x) (children 1)
     ExpressionList (children 2)
      Function toLowCardinality (children 1)
       ExpressionList (children 1)
        Literal \'abc\'
      Function in (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal UInt64_1
   ExpressionList (children 1)
    Identifier x
