SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 4)
    Identifier s
    Function replaceAll (alias a) (children 1)
     ExpressionList (children 3)
      Identifier s
      Literal \'_\'
      Literal \'o\'
    Function REGEXP_REPLACE (alias b) (children 1)
     ExpressionList (children 3)
      Identifier s
      Literal \'_\'
      Literal \'o\'
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier a
      Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function arrayJoin (alias s) (children 1)
            ExpressionList (children 1)
             Literal Array_[\'.__\', \'.\']