preview-datasets v1

[tanishgupta-db]

Changes

Adds databricks experimental preview-datasets <catalog.schema.table> command: shows a table's columns and sample data (or --output json). Runs SELECT * FROM <table> LIMIT n on a SQL warehouse. The warehouse is taken from --warehouse-id, DATABRICKS_WAREHOUSE_ID (env set), the workspace default, or user choice (mimics UI CUJ).

Why

Users want a quick look at the data and schema of a dataset quickly without leaving the terminal. Mirrors the Catalog Explorer "Sample Data" experience for the CLI. experimental until command group is decided.

Tests

• Unit tests and Acceptance tests

[github-actions]

An authorized user can trigger integration tests manually by following the instructions below:

Trigger:
go/deco-tests-run/cli

Inputs:

• PR number: 6033
• Commit SHA: f4c46a9a2b1e2e2b0f32890294a048ac06753534

Checks will be approved automatically on success.

[github-actions]

Waiting for approval

Based on git history, these people are best suited to review:

• @simonfaltum -- recent work in cmd/experimental/

Eligible reviewers: @andrewnester, @anton-107, @denik, @janniklasrose, @lennartkats-db, @pietern, @renaudhartert-db, @shreyas-goenka

_{Suggestions based on git history. See OWNERS for ownership rules.}