This (getFiles) method is marked as internal in Cache, and yes, it's typical internal as it's usage is relied on the strong internals knowledge :). Besides, it's hidden in IRIS, and its caller should be rewritten to achieve DBMS independence:

ClassMethod ListDir2(path = "", wildchar = "*", recursive As %String(VALUELIST=",y,n") = "y", ByRef dirlist)
{
 s pExtension=1
 s pExtension(1)=wildchar

#if $zversion["IRIS"
 s temp=$name(^IRIS.Temp)
#else
 s temp=$name(^CacheTemp)
#endif
 
 s pTempNode=$i(@temp)
 k @temp@(pTempNode)
   
 d ##class(%SQL.Util.Import).getFiles(path,.pExtension,pTempNode,recursive="y")
 m dirlist=@temp@(pTempNode)
 k @temp@(pTempNode)  ;zw dirlist
}