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PySpark Data Quality on Databricks with DQX.

A Deep Dive into Databricks Labs’ DQX: The Data Quality Game Changer for PySpark DataFrames

Recently, a LinkedIn announcement caught my eye—and honestly, it had me on the edge of my seat. Databricks Labs has unveiled DQX, a Python-based Data Quality framework explicitly designed for PySpark DataFrames.

Finally, a Dedicated Data Quality Tool for PySpark

Data Quality has always been a cyclical topic in the data community. Despite its importance, it’s been hampered by a lack of simple, open-source tools. Yes, we have options like Soda Core and Great Expectations, but they can be cumbersome to integrate. Enter DQX.

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What is a Data Platform?

You know, for all the hoards of content, books, and videos produced in the “Data Space” over the last few years, famous or others, it seems I find there are volumes of information on the pieces and parts of working in Data. It could be Data Quality, Data Modeling, Data Pipelines, Data Storage, Compute, and the list goes on. I found this to be a problem as I was growing in my “Data” career over the decades.

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Simplicity in the Modern Data Stack

We have all come to live in the Modern Data Stack, and whether we like it or not, our lives are no longer as simple as they were in the days of SQL Server and SSIS. Things have changed A LOT. There are good and bad sides to that coin.  The Modern Data Stack has brought us amazing innovations and tools and made things possible that were simply unheard of before.

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DuckDB reading CSVs from S3.

Recently, I was working on a little learning around DuckDB and AWS Lambda, which included some work with S3. It had been some time since I had tried working with files in S3, and it was kinda clunky the last time I tried it, whether it was DuckDB’s fault or mine, I was unsure.

It seems that when you go to Google and read about CSV files in S3 and DuckDB, in the past, folks had to do some gyrations with either boto3 or httpfs to get the job done. This is very annoying and clunky.

So I had the chance to revisit S3 and DuckDB with good ole’ CSV files and it was a much nicer experience. First, of course, you must have AWS credentials on the system somewhere, either in .aws or the ENV.

Something like this will do.

Next, you should instruct DuckDB to setup the AWS secrets, going through the normal rotation looking for credentials in the defaults spots as mentioned above.

Once this is done, querying a CSV file in S3 is as simple as it should be.

It’s nice to see DuckDB has first class support for querying files in S3, since cloud storage has become such a regular part of our lives. Any tool worth it’s weight in salt needs to have this sort of blind, easy to use file access that looks no different from operations on local files.

No more boto3 to load files into memory, etc, etc, that stuff needs to be abstracted away.

 

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Data Contracts were a LIE!

Today we talk about what is really going on with Data Contracts, they came in like a rocket a few years ago, but then died on the vine. What’s the deal?

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AWS S3 Tables. Technical Introduction.

Well, everyone is abuzz with the recently announced S3 Tables that came out of AWS reinvent this year. I’m going to call fools gold on this one right out of the gate. I tried them out, in real life that is, not just some marketing buzz, and it will leave most people, not all, be most, disappointed.

Surprise, surprise.

I wrote a more in-depth article here about the background and infighting between Databricks/Snowflake/AWS and the Lake House Storage Format wars. If you have time read that, but today, here, I just want to show you technically how to use S3 Tables in code.

Call it a technical introduction to S3 Tables.

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DuckDB … reading from s3 … with AWS Credentials and more.

In my never-ending quest to plumb the most boring depths of every single data tool on the market, I found myself annoyed when recently using DuckDB for a benchmark that was reading parquet files from s3. What was not clear, or easy, was trying to figure out how DuckDB would LIKE to read default AWS credentials.

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Testing DuckDB’s Large Than Memory Processing Capabilities.

I am a glutton for punishment, a harbinger of tidings, a storm crow, a prophet of the data land, my sole purpose is to plumb the depths of the tools we use every day in Data Engineering. I find the good, the bad, the ugly, and splay them out before you, string ’em up and quarter them.

Today, for the third time, we put that ole’ Duck to the test. I want to test to see if DuckDB has fixed their OOM (Out Of Memory) errors on commodity hardware … that age old problem of “larger than memory data sets.”

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Skip Lines of CSV files with DuckDB and Polars

There are some things you don’t need until you need them. I ran into that situation recently with needing to process some CSV / Flatfiles on short notice. At first, it appeared to be easy, but then I realized, as usual, there was a little monkey wrench thrown into the middle of it.

It is nothing earth-shattering, it’s just something that comes up so rarely that I forget there are ways to deal with these inconveniences without jumping through unnecessary hoops.

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How to make the PEFECT Pull Request (PR)

Is there anything worse than the PR process (Pull Request) at most companies? Probably not. It’s the dreaded 600-pound gorilla in the room that no one wants to talk about. Everyone hates it, everyone has to do it. But, it doesn’t have to be like that.

There are a few tried and true ways to make the perfect PR that takes all your problems away. Checkout the video for more.