duckdb excel插件和rusty_sheet插件在python中的不同表现

1. 建立虚拟环境
   安装python扩展包duckdb、polars和pandas

   python -m venv pwin313
   pwin313\scripts\activate.bat
   pwin313)C:\d\pwin313>pip install duckdb polars pandas

2. 在python中引入扩展包，安装加载duckdb插件

   pwin313) C:\d\pwin313>python
   Python 3.13.2 (tags/v3.13.2:4f8bb39, Feb 4 2025, 15:23:48) [MSC v.1942 64 bit (AMD64)] on win32
   Type "help", "copyright", "credits" or "license" for more information.

   import duckdb
   duckdb.sql("install excel")
   duckdb.sql("install rusty_sheet from community")
   import time

   duckdb.sql("load excel")
   duckdb.sql("load rusty_sheet")

rusty_sheet是 v0.4.2版。

分别测试两种插件不转成数据框和转成polars、duckdb数据框

>>> t=time.time();duckdb.sql("select * from read_xlsx('/d/lineitem.xlsx')");t1=time.time();print(t1-t)
0.3100736141204834
>>> t=time.time();duckdb.sql("select * from read_xlsx('/d/lineitem.xlsx')").pl();t1=time.time();print(t1-t)
4.7497313022613525
>>> t=time.time();duckdb.sql("select * from read_xlsx('/d/lineitem.xlsx')").fetchdf();t1=time.time();print(t1-t)
4.8916003704071045


>>> t=time.time();duckdb.sql("select * from read_sheet('/d/lineitem.xlsx',range='2:')");t1=time.time();print(t1-t)
4.251304626464844
>>> t=time.time();duckdb.sql("select * from read_sheet('/d/lineitem.xlsx',range='2:')").pl();t1=time.time();print(t1-t)
9.083962440490723
>>> t=time.time();duckdb.sql("select * from read_sheet('/d/lineitem.xlsx',range='2:')").fetchdf();t1=time.time();print(t1-t)
9.565066576004028

可见，read_xlsx不转数据框，则不实际读取数据，而read_sheet读取。