Commits on Jun 28, 2021

1. Implement timetable class for AIP-39 …

   This creates a new subpackage airflow.timetables, and implements
   timetable constructs that provides DAG scheduling logic. The timetable
   classes are used to refactor schedule inference logic out of the DAG
   class, and existing functions related to scheduling are refactored to
   use timetables (and deprecated).
   
   Usages of the deprecated DAG functions in Airflow's code base are
   modified to either use the timetable, or infer the information by other
   means. For example, usages of previous_schedule() (what was a DAG last
   scheduled to run before this run?) are refactored to query the database
   when the previous scheduled run actually happened, instead of using the
   schedule interval (cron or timedelta) in infer the information. This is
   because an AIP-39 timetable does not necessarily run on a periodic-ish
   schedule, and we cannot reliably infer when the previous run happened.

   

   uranusjr committed Jun 28, 2021
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