fix: replace absolute difference with difference in compareOperator

[zhaoyongjie]

SUMMARY

Currently, incorrect type of calculation in time comparsion, should replace absolute difference with difference

frontend codes at: apache-superset/superset-ui#1383

closes: #16766

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue: Absolute value diff is incorrect #16766
• 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 #16930 (c38e843) into master (87baac7) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

❗ Current head c38e843 differs from pull request most recent head f069f30. Consider uploading reports for the commit f069f30 to get more accurate results

@@            Coverage Diff             @@
##           master   #16930      +/-   ##
==========================================
- Coverage   76.97%   76.89%   -0.09%     
==========================================
  Files        1022     1022              
  Lines       54903    54903              
  Branches     7485     7485              
==========================================
- Hits        42262    42218      -44     
- Misses      12393    12437      +44     
  Partials      248      248              

Flag	Coverage Δ
hive	81.45% <100.00%> (ø)
mysql	81.85% <100.00%> (ø)
postgres	81.91% <100.00%> (ø)
presto	?
python	82.26% <100.00%> (-0.16%)	⬇️
sqlite	81.52% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/constants.py	100.00% <100.00%> (ø)
superset/utils/pandas_postprocessing.py	84.42% <100.00%> (ø)
superset/db_engine_specs/presto.py	84.30% <0.00%> (-6.07%)	⬇️
superset/connectors/sqla/models.py	85.83% <0.00%> (-1.42%)	⬇️
superset/models/core.py	89.26% <0.00%> (-0.74%)	⬇️

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[villebro]

LGTM if we can get a fast-follow with a migration!