SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Function arrayReduce (alias a) (children 1)
     ExpressionList (children 2)
      Literal \'uniq\'
      Literal Array_[UInt64_1, UInt64_2, UInt64_1]
    Function arrayReduce (alias b) (children 1)
     ExpressionList (children 3)
      Literal \'uniq\'
      Literal Array_[UInt64_1, UInt64_2, UInt64_2, UInt64_1]
      Literal Array_[\'hello\', \'world\', \'\', \'\']
    Function arrayReduce (alias c) (children 1)
     ExpressionList (children 3)
      Literal \'uniqUpTo(5)\'
      Literal Array_[UInt64_1, UInt64_2, UInt64_2, UInt64_1]
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal Array_[\'hello\', \'world\', \'\', \'\']
    Function arrayReduce (alias d) (children 1)
     ExpressionList (children 3)
      Literal \'uniqExactIf\'
      Literal Array_[UInt64_1, UInt64_2, UInt64_3, UInt64_4]
      Literal Array_[UInt64_1, UInt64_0, UInt64_1, UInt64_1]