Lazy API

The Lazy API page is under construction.

To demonstrate the lazy Polars capabilities we'll explore two medium-large datasets of usernames:

Reddit usernames dataset containing 69+ million rows

import polars as pl

from ..paths import DATA_DIR

dataset = pl.read_csv(f"{DATA_DIR}/reddit.csv", n_rows=10)

shape: (5, 6)
┌─────┬──────────────────────────┬─────────────┬────────────┬───────────────┬────────────┐
│ id  ┆ name                     ┆ created_utc ┆ updated_on ┆ comment_karma ┆ link_karma │
│ --- ┆ ---                      ┆ ---         ┆ ---        ┆ ---           ┆ ---        │
│ i64 ┆ str                      ┆ i64         ┆ i64        ┆ i64           ┆ i64        │
╞═════╪══════════════════════════╪═════════════╪════════════╪═══════════════╪════════════╡
│ 1   ┆ truman48lamb_jasonbroken ┆ 1397113470  ┆ 1536527864 ┆ 0             ┆ 0          │
│ 2   ┆ johnethen06_jasonbroken  ┆ 1397113483  ┆ 1536527864 ┆ 0             ┆ 0          │
│ 3   ┆ yaseinrez_jasonbroken    ┆ 1397113483  ┆ 1536527864 ┆ 0             ┆ 1          │
│ 4   ┆ Valve92_jasonbroken      ┆ 1397113503  ┆ 1536527864 ┆ 0             ┆ 0          │
│ 5   ┆ srbhuyan_jasonbroken     ┆ 1397113506  ┆ 1536527864 ┆ 0             ┆ 0          │
└─────┴──────────────────────────┴─────────────┴────────────┴───────────────┴────────────┘

and the Runescape username dataset containing about 55+ million records.

import polars as pl

from ..paths import DATA_DIR

dataset = pl.read_csv(f"{DATA_DIR}/runescape.csv", has_header=False, n_rows=10)

shape: (5, 1)
┌─────────────┐
│ column_1    │
│ ---         │
│ str         │
╞═════════════╡
│ a000        │
│ a0000       │
│ a000000     │
│ a0000000    │
│ a0000000000 │
└─────────────┘