SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier arr1
    Function arrayPushBack (children 1)
     ExpressionList (children 2)
      Identifier arr1
      Identifier val2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier array_functions
