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 hasAllTokens (children 1)
    ExpressionList (children 2)
     Function mapKeys (children 1)
      ExpressionList (children 1)
       Identifier map
     Literal \'K1 K2\'
