Why is there a NULL-entry in the "Fields and Values" section of the QGIS field calculator

Question

In the QGIS field calculator you can choose the Fields you want to add to your field calculator expression.

I wonder why there is also "NULL" listed as one option?

Choosing NULL as a value makes sense to me (for example 'field1 is null') but choosing NULL as a column identifier does not make sense to me.

Am i missing something or is this just a bug?

HDunn · Accepted Answer · 2018-10-18 10:25:30Z

1

It's a bug. Every layer has NULL in it's 3rd field.

And it looks like an old bug that hasn't been resolved yet, even in QGIS3

answered Oct 18, 2018 at 10:25

HDunn

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I have a pull request ready for this soon for QGIS 3.4 so it will now be a button and no longer in the field list.
– Nathan W
Commented Oct 22, 2018 at 2:23
@NathanW off topic but what's the intended use for this?
– HDunn
Commented Oct 22, 2018 at 11:57
Just inserts the value NULL into the expression really that is all.
– Nathan W
Commented Oct 23, 2018 at 13:07

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