rust/lancedb
1
0
Fork 0
mirror of https://github.com/lancedb/lancedb.git synced 2026-05-28 01:10:45 +00:00
Code Issues Packages Projects Releases Wiki Activity

docs: improve schema evolution api examples (#1929)

Browse Source
This commit is contained in:
QianZhu
2024-12-12 10:52:06 -08:00
committed by GitHub
parent 17e4022045
commit c0ee370f83
3 changed files with 24 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
docs/src/guides/tables.md
View File

@@ -804,12 +804,13 @@ a table:
You can add new columns to the table with the `add_columns` method. New columns
are filled with values based on a SQL expression. For example, you can add a new
column `y` to the table and fill it with the value of `x + 1`.
column `y` to the table, fill it with the value of `x * 2` and set the expected
data type for it.
=== "Python"
```python
table.add_columns({"double_price": "price * 2"})
--8<-- "python/python/tests/docs/test_basic.py:add_columns"
```
**API Reference:** [lancedb.table.Table.add_columns][]
@@ -849,8 +850,7 @@ rewriting the column, which can be a heavy operation.
```python
import pyarrow as pa
table.alter_column({"path": "double_price", "rename": "dbl_price",
"data_type": pa.float32(), "nullable": False})
--8<-- "python/python/tests/docs/test_basic.py:alter_columns"
```
**API Reference:** [lancedb.table.Table.alter_columns][]
@@ -873,7 +873,7 @@ will remove the column from the schema.
=== "Python"
```python
table.drop_columns(["dbl_price"])
--8<-- "python/python/tests/docs/test_basic.py:drop_columns"
```
**API Reference:** [lancedb.table.Table.drop_columns][]