I know your book and I like it However it does not answer the questions this issue is about (at least I do not get it from what I read there .
I might be used to use a misleading wording because of the "bulk insert" command of mssql that does exactly this: batch inserts https://msdn.microsoft.com/de-de/library/ms188365%28v=sql.120%29.aspx
The pull request for this issue is about the usage of the pooled optimizer. I thought everything to understand it is in the code of the pull request. Maybe I come up one day with another try about comparing different approaches to implement "batch inserts" in a fast way in hibernate - maybe using some microbenchmarks using jmh.
Thank you so far!