SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier name
    Identifier database
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.databases
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier name
     Literal \'default\'
