SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Function arrayConcat (children 1)
     ExpressionList (children 3)
      Identifier arr1
      Identifier arr2
      Identifier arr1
    Identifier arr1
    Identifier arr2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier array_functions
