SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier metric
    Identifier value
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.metrics
   Function in (children 1)
    ExpressionList (children 2)
     Identifier metric
     Literal Tuple_(\'PrimaryIndexCacheFiles\', \'PrimaryIndexCacheBytes\')
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier metric
