Improve documentation for nullif
kernel
#6658
Merged
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Which issue does this PR close?
Related to #6528
Rationale for this change
@tustvold pointed out the
nullif
kernel which is similar, but not the same, as what is asked for in #6528However the existing documentation for nullif was sparse and hard (for me) to discover
What changes are included in this PR?
Improve the documentation and add an example
Are there any user-facing changes?
Documentation only, no code changes