feat(sqlglot): Vertica dialect

[betodealmeida]

SUMMARY

Vertica currently uses the Postgres dialect, since it's based on its wire protocol. But some functions end up being translated incorrectly when we apply RLS and go through a cycle of parsing/modifying/rendering. For example:

>>> from superset.sql.dialects.vertica import Vertica
>>> from sqlglot import parse_one
>>> parse_one("SELECT LAST_DAY(DATE('2026-01-15'))").sql()
"SELECT LAST_DAY(DATE('2026-01-15'))"
>>> parse_one("SELECT LAST_DAY(DATE('2026-01-15'))", "postgres").sql("postgres")
"SELECT CAST(DATE_TRUNC('MONTH', DATE('2026-01-15')) + INTERVAL '1 MONTH' - INTERVAL '1 DAY' AS DATE)"
>>> parse_one("SELECT LAST_DAY(DATE('2026-01-15'))", Vertica).sql(Vertica)
"SELECT LAST_DAY(DATE('2026-01-15'))"

This PR introduces a Vertica dialect, with support for functions that behave differently from Postgres.

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

[bito-code-review]

Code Review Agent Run #cad16d

Actionable Suggestions - 0

Review Details

• Files reviewed - 4 · Commit Range: 1305b74..1305b74

  • superset/sql/dialects/__init__.py
  • superset/sql/dialects/vertica.py
  • superset/sql/parse.py
  • tests/unit_tests/sql/dialects/vertica_tests.py
• Files skipped - 0
• Tools

  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful
  • MyPy (Static Code Analysis) - ✔︎ Successful
  • Astral Ruff (Static Code Analysis) - ✔︎ Successful

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[codecov]

Codecov Report

❌ Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.88%. Comparing base (aa71067) to head (e1f365c).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/sql/dialects/vertica.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #39969   +/-   ##
=======================================
  Coverage   63.88%   63.88%           
=======================================
  Files        2583     2584    +1     
  Lines      136618   136635   +17     
  Branches    31502    31502           
=======================================
+ Hits        87272    87288   +16     
- Misses      47830    47831    +1     
  Partials     1516     1516           

Flag	Coverage Δ
hive	39.38% <94.73%> (+0.01%)	⬆️
mysql	59.05% <94.73%> (+<0.01%)	⬆️
postgres	59.12% <94.73%> (+<0.01%)	⬆️
presto	41.08% <94.73%> (+0.01%)	⬆️
python	60.56% <94.73%> (+<0.01%)	⬆️
sqlite	58.76% <94.73%> (+<0.01%)	⬆️
unit	100.00% <ø> (ø)

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[Vitor-Avila]

Approved! Thank you so much

[bito-code-review]

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