Column name generated on the fly

KNIME Analytics Platform
1

Hello,

Is there a way to create a new column with its column name generated on the fly in a Java snippet ? Basically, I am generating a column name based on values from the incoming data stream, and each time this name will be different.

Thank you

2

Hello,

Just use a flow variable as the output column name (outCols/_index of output (probably 0)_/Name) and it will replace the one you previously specified.

Cheers, gabor

3

Hi gabor,

Thank you for your answer. I'm new to Knime and I don't get exactly what you mean, sorry.

Maybe as information: I'm generating more than one new column at a time (but don't know a priori how many). And then a new calculated value (extracted from the input stream) is assigned to each of these column.

Hope you can help.

Cheers

Serge

4

In case you do need variable number of new columns, you will need one of the scripting (R, Jython, ...) nodes, I think the Java Snippet is not suitable for this. The option I described only works for fix number of new columns.

5

Instead of producing an unknown number of single-value columns, you could make a single collection column, i.e have your java snippet produce an array. You could then then split the collection column using the appropriate node, which will give you a number of columns equal to the longest array.