tetron
March 10, 2020, 5:53pm
1
Hello everyone,
The draft for the next release of the CWL specification is ready for
https://www.commonwl.org/v1.2.0-dev1/
The changelog for this version can be found here:
https://www.commonwl.org/v1.2.0-dev1/Workflow.html#Changelog
Those wishing to learn more about the conditionals feature can find
As well as reading the design document:
# Conditionals (2019)
## Abstract
This is a documentation of the design and design decisions for conditionals as outlined in
[issue 854](https://github.com/common-workflow-language/common-workflow-language/issues/854)
The design adds a new field `when` to a `WorkflowStep`. This field is an expression that
evaluates to `True` or `False`. The executor runs the step if the value is `True`,
skips it if `False`. A skipped step produces `null` values on all its outputs.
The design also adds a new `Sink` field `pickValue` which operates after `linkMerge` and serves to
filter out null values. While this can be used independently of the conditionals feature the
`first_non_null` and `only_non_null` operators are intended for the specific case
where a list of inputs - some coming from conditional steps - converge on a scalar input.
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Thanks,
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stain
April 20, 2020, 4:04pm
2
Draft 1.2.0-dev2 replaces 1.2.0-dev1, links are now:
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