Define a WDL workflow to merge jointly called VCF files. Input and output files may be stored locally, or in Google
Storage if prefixed with gs://.


Samtools is used to perform the merge. Each input VCF should describe a single
chromosome, and should have equivilent headers.

In order to keep hard disk requirements small, and improve performance, when using gs://, input/output objects are
streamed directly from Google Storage using

This is a companion discussion topic for the original entry at