Add: sample value fetch function

[AnshumanX304]

Fixes/Implements

Description

Summary Goes here.

Type of change

Delete irrelevant options.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Locally Tested
• Needs Testing From Production

Summary by CodeRabbit

• New Features
  • Added the ability to fetch sample values from specified columns in a table for PostgreSQL and Sybase data sources, with an adjustable row limit. This enables quick data previews for validation and exploration.
• Chores
  • No changes to existing behaviors; the new capability integrates with existing connection and qualification logic without affecting current workflows.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Adds a new public method fetch_sample_values_from_database to PostgresDataSource and SybaseDataSource. The method validates inputs, qualifies table names, quotes columns, builds a limited SELECT, executes it, and returns fetched rows. Existing methods remain unchanged.

Changes

Cohort / File(s)	Summary
Database sample fetch API dcs_core/integrations/databases/postgres.py, dcs_core/integrations/databases/sybase.py	Introduced fetch_sample_values_from_database(table_name, column_names, limit) to fetch limited rows for specified columns. Implements input validation, table qualification, column quoting, query construction (LIMIT for Postgres, TOP for Sybase), execution, and returning rows.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant C as Caller
  participant DS as PostgresDataSource
  participant DB as Postgres

  C->>DS: fetch_sample_values_from_database(table, columns, limit)
  DS->>DS: Validate columns non-empty
  DS->>DS: Qualify table name + quote identifiers
  DS->>DB: SELECT columns FROM qualified_table LIMIT n
  DB-->>DS: Rows
  DS-->>C: Rows

Loading

sequenceDiagram
  autonumber
  participant C as Caller
  participant DS as SybaseDataSource
  participant DB as Sybase

  C->>DS: fetch_sample_values_from_database(table, columns, limit)
  DS->>DS: Validate/prepare names, quote columns
  DS->>DB: SELECT TOP n columns FROM qualified_table
  DB-->>DS: Rows
  DS-->>C: Rows

Loading

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I nibbled code like clover leaves,
Plucked columns, five in sleeves.
Postgres fields and Sybase rows,
Sample bites are how it goes.
Hop, select, and swiftly run—
Fetching snacks, my query fun! 🐇✨

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch version-bump-v0.9.0

---

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1e6e5a6 and 9500b03.

📒 Files selected for processing (2)

• dcs_core/integrations/databases/postgres.py (1 hunks)
• dcs_core/integrations/databases/sybase.py (1 hunks)

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}