> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hotglue.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Polars Dataframe Reader

## PolarsReader

While Lazyframes are more efficient, certain operations can be trickier to implement, For small-data operations, you may be better of using the standard Polars Dataframe with `PolarsReader`:

```python theme={null}
import gluestick as gs
import polars as pl

reader = gs.PolarsReader()

TENANT_ID = "TENANT_123"

for stream in reader.input_files.keys():
    df = reader.get(stream, catalog_types=True)
    df["tenant_id"] = TENANT_ID
    gs.to_export(df, stream, "./etl-output", keys=["id"])
```