tree 0b197a0d2b14ef84b854133af7f9a05ad84dc729
parent 5201cfa1030909e282087bf81c937c72c98f9391
author David Fang <fangism@google.com> 1600209478 -0700
committer Henner Zeller <h.zeller@acm.org> 1600211783 -0700

Support pairing each alignment group with a different column extractor.

Refactoring internal interface only, no functional change.

PiperOrigin-RevId: 331871713