SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
   Function hasAnyTokens (children 1)
    ExpressionList (children 2)
     Function mapKeys (children 1)
      ExpressionList (children 1)
       Identifier map
     Literal \'K1 K2\'
