b) Bug fixes and update to how we represent indels and other complex events in a VariantContext object. Convention is now that all events are left aligned, with the first variant context location marking the common base before an event occurs. However, alleles in a VC don't have the common base in all VC's. Two new functions are now part of VariantContextUtils: CreateVariantContextWithPaddedAlleles and CreateVariantContextWithTrimmedAlleles. Both take a VC as an input and create a VC as an output.
Main flow is that a VCF reader would create a VC with trimmed alleles, all walkers would ideally work with these trimmed alleles, and then the VCF writer would pad back the alleles before writing. However, there are special cases where we need to pad alleles like for example when merging/combining VC's.
Pending issues:
- PED and DBSNP RODs have to be updated to create VC's for indels following the convention above. Changes will go in after Tribble location is moved and things are tested.
- Need to verify Indel genotyper and other modules that create VC's with indels.- Wiki page describing convention above and how walkers should interpret indel VC's still needs updating/detailing.
git-svn-id: file:///humgen/gsa-scr1/gsa-engineering/svn_contents/trunk@3850 348d0f76-0448-11de-a6fe-93d51630548a
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