mirror of
https://github.com/lancedb/lancedb.git
synced 2026-07-02 02:20:41 +00:00
fbe6a5a3fd
A computed column is an expression over a registered function applied to input
columns, not a UDF coupled to a column. fn("data") already returned the expression
string "fn(data)"; make it a ColumnExpr (a str subclass) that also carries the
function's return type, so add_columns(computed={"vec": embed("data")}) declares the
column with no hand-written type. _normalize_computed handles the new form (and tuple
keys for STRUCT fan-out) and keeps the legacy {col: (sql_type, expression)} tuple.
add_computed_column is deprecated (delegates, with a DeprecationWarning). The function
stays decoupled from columns -- register once, apply anywhere.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
LanceDB Python SDK
A Python library for LanceDB.
Installation
pip install lancedb
Preview Releases
Stable releases are created about every 2 weeks. For the latest features and bug fixes, you can install the preview release. These releases receive the same level of testing as stable releases, but are not guaranteed to be available for more than 6 months after they are released. Once your application is stable, we recommend switching to stable releases.
pip install --pre --extra-index-url https://pypi.fury.io/lancedb/ lancedb
Usage
Basic Example
import lancedb
db = lancedb.connect('<PATH_TO_LANCEDB_DATASET>')
table = db.open_table('my_table')
results = table.search([0.1, 0.3]).limit(20).to_list()
print(results)
Development
See CONTRIBUTING.md for information on how to contribute to LanceDB.