feat: add connector for CouchbaseDB

[ayush33143314]

SUMMARY

Add support for couchbase db. https://www.couchbase.com/products/analytics/

TESTING INSTRUCTIONS

mannual Testing

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

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 79.03226% with 13 lines in your changes missing coverage. Please review.

Project coverage is 83.74%. Comparing base (76d897e) to head (fae8eb9).
Report is 356 commits behind head on master.

Files	Patch %	Lines
superset/db_engine_specs/couchbase.py	79.03%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #29225       +/-   ##
===========================================
+ Coverage   60.48%   83.74%   +23.25%     
===========================================
  Files        1931      519     -1412     
  Lines       76236    37685    -38551     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    31559    -14555     
+ Misses      28017     6126    -21891     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	48.95% <79.03%> (-0.21%)	⬇️
javascript	?
mysql	77.29% <79.03%> (?)
postgres	77.40% <79.03%> (?)
presto	53.55% <79.03%> (-0.26%)	⬇️
python	83.74% <79.03%> (+20.25%)	⬆️
sqlite	76.86% <79.03%> (?)
unit	59.24% <79.03%> (+1.61%)	⬆️

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[hughhhh]

you can you add BasicParametersMixin to this since using MYSQL dialect
https://github.com/apache/superset/blob/master/superset/db_engine_specs/base.py#L2276

[john-bodley]

Thanks @ayush33143314 for adding the engine. Would you also mind:

• Adding unit/integration tests (where necessary)
• Updating the various documentation which outlines which engines we support etc.

[rusackas]

Thank you for this! Would it also be possible to add a docs entry here?

[ayush-couchbase]

Thank you for this! Would it also be possible to add a docs entry here?

Hi , yes, I am preparing the doc, I will submit doc along with tests in next patchset. Sorry for this patch. It is still in progress.

[rusackas]

Ahh, ok, thanks! Feel free to add [WIP] to the title and/or convert it to a draft PR if you need a while to keep working on it, just so others don't assume it's ready for review like I did. Thanks again!