Return column comments in SQLAlchemy get_columns

[hashhar]

Description

Include the hidden information_schema.columns.comment column in the dialect's _get_columns query so that SQLAlchemy's Inspector.get_columns() exposes column comments via the ReflectedColumn comment field.

Non-technical explanation

Fixes #581

Release notes

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* Return column comments in SQLAlchemy get_columns. ({issue}`581`)

[azawlocki-sbdt]

LGTM

[hashhar]

@coderabbitai full review

[coderabbitai]

✅ Action performed

Full review finished.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6422a0b1-df81-47ee-8239-32b3d963e062

📥 Commits

Reviewing files that changed from the base of the PR and between 7b74702 and 7dbddd0.

📒 Files selected for processing (2)

• tests/integration/test_sqlalchemy_integration.py
• trino/sqlalchemy/dialect.py

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📝 Walkthrough

Walkthrough

The SQLAlchemy dialect’s column metadata query now retrieves the comment field from information_schema.columns and includes it in each reflected column dictionary. A version-gated integration test creates a table with commented and uncommented columns, validates the values returned by Inspector.get_columns(), and cleans up the table.

Assessment against linked issues

Objective	Addressed	Explanation
Return column comments from Inspector.get_columns() [#581]	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes found.

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