Handle NULL in Magic
It would be nice to have a tile, or an option in Alter or Join tiles to mass handle NULL values.
I understand that I can use a formula for every column as follows but after about 3 columns it gets tedious.
case when `col1` is NULL then '' else `col1` end
Comments
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If the NULL values exist in the input dataset, you can configure that fields settings in the "Input DataSet" tile.
Not as easy as a tile to handle it for all fields at once but it is easier than a formula tile.
3 -
@TheLookout That's awesome! Thank you, this will save me a bunch of time.
1 -
@JasonAltenburg I wanted to add one thing, if you're doing this later in the dataflow you can use the IFNULL() command rather than a case statement.
IFNULL(`col1`,'')
will return the same value as your example case statement. I use that in combination with the NULLIF() command frequently.IFNULL(NULLIF(`col1`,''),`col2`)
If column 1 is blank or null, it will be replaced by column 2. If column 1 is not blank or null, it will remain its current value. A little more concise then writing out a full case statement or coalesce.1 -
Could we also add a feature to this to mass handle NULL OR blank strings (even if one space)
I always end up writing something like:
- case
- when `col1` is NULL or Len(trim(`col1`) <1 then ''
- else `col1`
- end
2 -
I just ran into this problem again, I appreciate your feedback @DuncanDomo that's exactly the sort of tile I'd like to see. Creating another dataflow and chaining them just to handle nulls is a bit problematic and looks bad / hard to teach for end users.
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