v0.4.20-nightly

What's Changed

Bug Fixes

• [functions] fix count return null (#821) by @sundy-li

Dependency Updates

• Bump anyhow from 1.0.40 to 1.0.41 (#813) by @dependabot[bot]

Documentation

• [docs] add aggregate combinator (#818) by @bohutang

Improvement

• [common/aggregate] refine the tests (#820) by @bohutang