Propose cache type simple

[dpgaspar]

CATEGORY

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Seems like #9019 makes startup fail on a default configuration. Tests pass because they set cache to simple. We can revert/fix #9019 or change cache default to simple (assuming it's limitations): https://flask-caching.readthedocs.io/en/latest/#simplecache

Startup error:

class PrestoEngineSpec(BaseEngineSpec):
  File "/home/dpgaspar/workarea/preset/preset_fork_superset/superset/db_engine_specs/presto.py", line 950, in PrestoEngineSpec
    @cache.memoize()
  File "/home/dpgaspar/workarea/preset/v_superset/lib/python3.6/site-packages/werkzeug/local.py", line 348, in __getattr__
    return getattr(self._get_current_object(), name)
AttributeError: 'NoneType' object has no attribute 'memoize'

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

[dpgaspar]

Closing, only saw #9020 now

[codecov-io]

Codecov Report

Merging #9024 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9024   +/-   ##
=======================================
  Coverage   59.15%   59.15%           
=======================================
  Files         367      367           
  Lines       11686    11686           
  Branches     2866     2866           
=======================================
  Hits         6913     6913           
  Misses       4594     4594           
  Partials      179      179

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