fix: pivot col names in post_process

[betodealmeida]

SUMMARY

This fix some bugs in the pivot table post processing.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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 #16262 (d4b3d7d) into master (9b2dffe) will decrease coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #16262      +/-   ##
==========================================
- Coverage   76.72%   76.48%   -0.25%     
==========================================
  Files         997      997              
  Lines       53241    53239       -2     
  Branches     6772     6772              
==========================================
- Hits        40849    40718     -131     
- Misses      12162    12291     +129     
  Partials      230      230              

Flag	Coverage Δ
hive	?
mysql	81.52% <100.00%> (-0.05%)	⬇️
postgres	81.55% <100.00%> (-0.05%)	⬇️
presto	?
python	81.63% <100.00%> (-0.48%)	⬇️
sqlite	81.19% <100.00%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
superset/charts/post_processing.py	76.47% <100.00%> (-0.55%)	⬇️
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.80% <0.00%> (-16.87%)	⬇️
superset/db_engine_specs/presto.py	83.47% <0.00%> (-6.91%)	⬇️
superset/utils/date_parser.py	93.13% <0.00%> (-3.44%)	⬇️
superset/common/query_context.py	88.88% <0.00%> (-1.86%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	88.04% <0.00%> (-1.66%)	⬇️
superset/db_engine_specs/base.py	88.00% <0.00%> (-0.39%)	⬇️
superset/models/core.py	89.14% <0.00%> (-0.26%)	⬇️
... and 1 more

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[Kingflyinger]

rate value totals in pivot table not work as in table.May it be changed in the future?
thanks

[villebro]

Yes, I agree totally with you @Kingflyinger, the "Totals" should use the same aggregation logic as the cell values. This has come up a few times but didn't yet get addressed, and requires some additional logic in the query layer that might take some time to implement (we have to issue a separate query for each layer of totals/subtotals). Do you mind opening an issue here so we can get it prioritized and assigned when the right time comes along?

[Kingflyinger]

@villebro I opened the issue #16829，and the way it totals means a lot