SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Function uniqExact (alias u) (children 1)
     ExpressionList (children 1)
      Identifier x
    Function uniqExactIf (alias ue) (children 1)
     ExpressionList (children 2)
      Identifier x
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier name
        Literal \'a\'
    Function uniqExactIf (alias ui) (children 1)
     ExpressionList (children 2)
      Identifier x
      Function in (children 1)
       ExpressionList (children 2)
        Identifier name
        Literal Tuple_(\'a\', \'b\')
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Function toNullable (alias name) (children 1)
            ExpressionList (children 1)
             Literal \'a\'
           Function arrayJoin (alias x) (children 1)
            ExpressionList (children 1)
             Function range (children 1)
              ExpressionList (children 1)
               Literal UInt64_10
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier name
     Literal \'a\'