feat: generate label map on the backend

[zhaoyongjie]

SUMMARY

Currently, the timeseries chart has a variable labelMap, used for mapping result columns(or series) and dimension values. If the result columns contain comma(,), this mapping can't reverse calculation dimension values on the frontend. This issue was blocked drill to detail.

This PR intends to generate labelMap on the backend. The frontend only needs to replace the labelMap from the chart query response.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Pure backend change, should pass all 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 #21124 (4dbffc7) into master (252ceb7) will decrease coverage by 11.45%.
The diff coverage is 100.00%.

❗ Current head 4dbffc7 differs from pull request most recent head 798c2a5. Consider uploading reports for the commit 798c2a5 to get more accurate results

@@             Coverage Diff             @@
##           master   #21124       +/-   ##
===========================================
- Coverage   66.32%   54.86%   -11.46%     
===========================================
  Files        1772     1772               
  Lines       67651    67662       +11     
  Branches     7205     7205               
===========================================
- Hits        44867    37123     -7744     
- Misses      20941    28696     +7755     
  Partials     1843     1843               

Flag	Coverage Δ
hive	53.18% <75.00%> (+<0.01%)	⬆️
mysql	?
postgres	?
presto	53.07% <75.00%> (+<0.01%)	⬆️
python	57.82% <100.00%> (-23.69%)	⬇️
sqlite	?
unit	50.74% <83.33%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/common/query_context_processor.py	62.60% <100.00%> (-25.89%)	⬇️
superset/utils/pandas_postprocessing/__init__.py	100.00% <100.00%> (ø)
superset/utils/pandas_postprocessing/flatten.py	100.00% <100.00%> (ø)
superset/utils/pandas_postprocessing/utils.py	96.55% <100.00%> (+0.39%)	⬆️
superset/utils/dashboard_import_export.py	0.00% <0.00%> (-100.00%)	⬇️
superset/key_value/commands/update.py	0.00% <0.00%> (-88.89%)	⬇️
superset/key_value/commands/delete.py	0.00% <0.00%> (-85.30%)	⬇️
superset/key_value/commands/delete_expired.py	0.00% <0.00%> (-80.77%)	⬇️
superset/dashboards/commands/importers/v0.py	15.62% <0.00%> (-76.25%)	⬇️
superset/datasets/commands/update.py	25.00% <0.00%> (-69.05%)	⬇️
... and 282 more

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[zhaoyongjie]

/testenv up

[github-actions]

@zhaoyongjie Ephemeral environment spinning up at http://54.148.237.28:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[geido]

Code LGTM!

[michael-s-molina]

Thank you for the PR @zhaoyongjie.

I noticed the labelMap is not being correctly generated when using a pie chart. Is the objective of this PR to generate the labelMap on the server side for all chart types or just time series?

Screen.Recording.2022-08-22.at.8.35.13.AM.mov

[zhaoyongjie]

@michael-s-molina Nice catch! I just realized that Pie has no make Pivot! for now, this feature just supports a chart that contains a pivot operator.

I also update the PR description.

[michael-s-molina]

LGTM

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.