Certain queries (e.g. summarize rate(1) by bin_auto(_time), <field>) return incorrect results in 0.6.0

[tasgon]

(Initially made a comment about this in #74 but now think it's probably a separate issue.)

After upgrading to 0.6.0 (and modifying my Grafana charts to use 'Prepare time series'), certain queries, such as anything involving summarize rate(1) by bin_auto(_time), <field>, return results that are drastically different (and always larger) than running the same query in axiom.co. The error appears to scale with the number of time series returned, but I'm not fully sure. summarize count() by bin_auto(_time), <field> appears to be unaffected.

[bahlo]

Hi @tasgon, thank you for raising this! We'll take a look and get back to you 🙌