On 1/27/20 8:11 AM, Richard Duivenvoorde wrote:
On 27/01/2020 07.29, Nyall Dawson wrote:
On Sat, 25 Jan 2020 at 19:32, Richard Duivenvoorde <[email protected]> wrote:
Hi Devs,
tldr; should the '||'-button in QGIS expressions not either behave like
a real 'String concat' function,
or
as a logical OR
or
be removed? <= my favourite
Massive -1. Just because something is complex, doesn't make it wrong!
It's not complex, it is not behaving as most people think it is, or are
familiar with AND there is not 'help' for these buttons (in contrast
with the functions, where you could describe this behaviour).
As said, it was my frustration (as in: instead of just 'using' I ended
up trying and testing) that I "lost" labels just because whole records
were ignorred, because certain columns had NULL values, and I ended up
with an overly complex expression which tested IF the value was NULL.
It's when I thought it was a bug that I found that other people, also
had been there, AND found that there was another 'concat' function
behaving a little different.
In general I prefer a single intuitive working way of doing things, do I
agree that 'intuitive' is very personal :-(
For what it's worth, I agree with Richard that it's often not what's
expected. And the worst is that on first sight it looks as if it's
working as expected.
Having the button for the unexpected more prominent than the function
someone was looking for is not the most helpful thing.
In courses I always teach people to stay away from `||` unless they
really know what they are doing.
I'm in favor of removal of the quick access button too.
The functionality of `||` on the other hand should be left untouched.
(it's useful to have e.g. `prefix || filename` produce NULL if filename
is NULL)
Matthias
Regards,
Richard Duivenvoorde
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