https://github.com/mdh266/polarsduckdbplayground
Playing Around With Polars On AWS
https://github.com/mdh266/polarsduckdbplayground
aws-ec2 data-science dataframe-library docker duckdb pandas polars s3 sql
Last synced: 2 months ago
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Playing Around With Polars On AWS
- Host: GitHub
- URL: https://github.com/mdh266/polarsduckdbplayground
- Owner: mdh266
- License: mit
- Created: 2023-07-05T00:57:41.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2023-08-27T17:56:27.000Z (over 1 year ago)
- Last Synced: 2025-01-31T14:43:15.969Z (4 months ago)
- Topics: aws-ec2, data-science, dataframe-library, docker, duckdb, pandas, polars, s3, sql
- Language: Jupyter Notebook
- Homepage:
- Size: 4.37 MB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Polars DataFrame PlayGround
-------------------
In this post I quickly covered what I view as the limitations in [Pandas](https://pandas.pydata.org/) library:
1. High memory usage
2. Limited multi-core algorithms
3. No ability to execute SQL statements (like [SparkSQL & DataFrame](https://spark.apache.org/sql/))
4. No query planning/lazy-execution
5. [NULL values only exist for floats not ints](https://pandas.pydata.org/docs/user_guide/integer_na.html) (this changed in Pandas 1.0+)
6. Using [strings is inefficient](https://pandas.pydata.org/docs/user_guide/text.html) (this too changed in Pandas 1.0+)
Many of these issues have been addressed by the [Pandas 2.0 release](https://pandas.pydata.org/docs/dev/whatsnew/v2.0.0.html), but **I still feel the API is awkward!**
So in this post I go over two alternatives:
* [Polars](https://www.pola.rs/) for dataframes
* [DuckDB](https://duckdb.org/) for SQL queries
I cover how to get set up in with
Juptyer lab using [Docker](https://www.docker.com/) on [AWS](https://aws.amazon.com/) as well as some basics of [Polars](https://www.pola.rs/), [DuckDB](https://duckdb.org/) and how to use the two in combination. The benefits of Polars is that,
* It allows for fast parallel querying on dataframes.
* It uses [Apache Arrow](https://arrow.apache.org/) for backend datatypes making it efficient for memory.
* It has both lazy and eager execution mode.
* It allows for SQL queries direcly on dataframes.
* Its API is similar to Spark's API and allows for highly readable queries using method chaining.
DuckDB is a blazingly fast [OLAP](https://aws.amazon.com/what-is/olap/) SQL query engine. In the context of this blog post I cover how to use it to run SQL queries against Pandas/Polars dataframes and even local Parquet files!
## Using The Notebook
----------
You can install the dependencies and access the notebook using Docker by building the Docker image with the following:
docker build -t polars_nb .
Followed by running the command container:
docker run -ip 8888:8888 -v `pwd`:/home/jovyan -t polars_nb
See here for more info.
Otherwise without Docker, make sure to use Python 3.10 and install the libraries listed in requirements.txt. These can be installed with the command,
pip install -r requirements.txt