SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function splitByChar (alias version_pair) (children 1)
     ExpressionList (children 2)
      Literal \' \'
      Function getOSKernelVersion (children 1)
       ExpressionList
   ExpressionList (children 1)
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Identifier version_pair
      Literal UInt64_1
