harlequin-odbc-vertica

A Harlequin adapter for Vertica via ODBC.

This adapter extends harlequin-odbc to fix Vertica-specific issues with catalog and column metadata retrieval.

Problem

The standard harlequin-odbc adapter has two issues when used with Vertica:

Empty Data Catalog: Vertica's ODBC driver returns None for catalog names, causing all tables to be filtered out.
Column listing error: Vertica's ODBC driver does not support the catalog parameter in SQLColumns, resulting in HYC00 errors.

harlequin-odbc-vertica overrides two methods in the ODBC adapter:

_list_tables: Uses SELECT current_database() as a fallback when the catalog name is None.
_list_columns_in_relation: Omits the catalog parameter when calling pyodbc.Cursor.columns().

pip install harlequin-odbc-vertica

Or with uv:

uv tool install harlequin --with harlequin-odbc-vertica

You need:

harlequin -a odbc-vertica 'DRIVER={Vertica};SERVER=your-server;PORT=5433;DATABASE=your-db;UID=user;PWD=password'

MIT

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Uploaded Aug 28, 2026 Python 3

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