(ITS#8220) refint performance issue

Full_Name: Howard Chu Version: 2.4 OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (78.155.231.135) Submitted by: hyc

The fix for ITS#5097 changed refint to support subtree renames. Unfortunately this required using dnSubtreeMatch extended search filters, which are not indexable, so every refint invocation invokes a search that scans the entire DB.

This behavior isn't necessary; such an extensive search is only needed if we know that the entry being modified actually has children. If we know that the entry has no children, we can use the original code which used an equality match, which *is* indexable, and save significant overhead.

Patch coming shortly.