I have taken the latest version of KNIME from the downloads page. Installed the Basic chemistry types plugin and re-tested this workflow. The issue is still reproducible.
I’ve also found some new behaviour, getting the issue to trigger on the bottom branch causing the node on the top branch to ‘hang’, I don’t see anything in the log indicating the Row Sampling has crashed.
I have tried to filter the table down a bit to see the features required in the data to trigger the bug.
Still happens with 1000 rows but doesn’t happen if I remove the molfile column (which is presumably the only Blob type in the table).
I have attempted to make a publicly shareable version of the workflow by replacing the structures with some dummy ones but this new table doesn’t trigger the bug 
I can send this workflow to KNIME privately though if that would help.
I’ve attached a workflow log, actions taken:
- Load workflow
- Reset constant val column, run both nodes
- Reset constant val column, run both nodes
- View Row filter table, sort on pchembl_value
- Resent constant value column, run both nodes <- bug triggered
knime.log (25.9 KB)
Presumably links in with the temp files that are reported to be deleted?
Cheers
Sam