[Bug] "Column Auto Type Cast" changes internal configuration on KNIME restart

The node “Column Auto Type Cast” seems to changes it’s configuration (or simply bugs out?) after a KNIME restart, when checking for empty cells.

And yes, configurations were saved.

Node: Column Auto Type Cast
Config: Missing value pattern -> <empty>
Result after configuration: An empty cell gets replaced with missing
Result after Restart: An empty cell gets passed through
Result after Restart and reconfiguration: change the value to <none>, apply and then back to <empty> so the change takes effect -> An empty cell gets replaced with missing
Repeatable: Yes. Tested on multiple PCs
Fastest reproduction: Table Creator with 1 cell -> String Manipulator to replace it with an empty cell [string("")] -> Column Auto Type Cast

Thank you for your question. Unfortunately, I was not able to reproduce the issue. For me the empty cell gets replaced with missing also after a restart. Which KNIME AP version are you using, 3.6.1?


I managed to reproduce it. I’m using 3.6. Here is workflow:

AutoCast error reproduction.knwf (4.4 KB)


Thanks Kilian and Ivan,

I was able to reproduce the issue and will track a bug for this.

I’ll let you know as soon as we have a patch available.


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FYI: This bug has been fixed in our latest nightly build.

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