chore(druid): Explicitly cast col to TIMESTAMP

[john-bodley]

SUMMARY

This speaks somewhat to SIP-15A and the proof-of-concept defined in #7682, but in theory any column in Druid (and not just __time which is of type TIMESTAMP) could be used as the temporal column and thus should first be converted to a TIMESTAMP.

This PR replicates the Presto logic which leveraging CAST(x AS TIMESTAMP) which works when x is a DATE, TIMESTAMP or STRING (these adhere to the ISO 8601 format per the column "DATETIME FORMAT"), i.e.,

druid> SELECT CAST(TIMESTAMP '2021-01-01 00:00:00' AS TIMESTAMP)
2021-01-01T00:00:00.000Z

druid> SELECT CAST(DATE '2021-01-01' AS TIMESTAMP)
2021-01-01T00:00:00.000Z

druid> SELECT CAST('2021-01' AS TIMESTAMP)
2021-01-01T00:00:00.000Z

Long term it would be good to implement something similar to the proof-of-concept to bring clarity to the various transforms and type conversions which are needed for both the left- and right-hand-side of a comparator.

TESTING INSTRUCTIONS

CI.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #17101 (625eaf0) into master (8d54dee) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 625eaf0 differs from pull request most recent head 4c7c560. Consider uploading reports for the commit 4c7c560 to get more accurate results

@@            Coverage Diff             @@
##           master   #17101      +/-   ##
==========================================
- Coverage   76.75%   76.72%   -0.04%     
==========================================
  Files        1031     1031              
  Lines       55198    55198              
  Branches     7504     7504              
==========================================
- Hits        42365    42348      -17     
- Misses      12583    12600      +17     
  Partials      250      250              

Flag	Coverage Δ
hive	?
mysql	81.92% <ø> (?)
postgres	81.92% <ø> (?)
presto	?
python	82.01% <ø> (-0.06%)	⬇️
sqlite	81.61% <ø> (?)

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Impacted Files	Coverage Δ
superset/db_engine_specs/druid.py	86.27% <ø> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	69.76% <0.00%> (-17.06%)	⬇️
superset/db_engine_specs/presto.py	83.47% <0.00%> (-6.91%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	85.59% <0.00%> (-1.66%)	⬇️
superset/utils/core.py	89.84% <0.00%> (-0.13%)	⬇️
superset/views/base_api.py	98.31% <0.00%> (+0.42%)	⬆️
superset/common/query_context.py	90.90% <0.00%> (+0.45%)	⬆️
superset/security/manager.py	91.84% <0.00%> (+0.52%)	⬆️
... and 15 more

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