This is well timed as PRQL 0.9 was just released a few hours ago. Have a look at the release notes here: https://github.com/PRQL/prql/releases/tag/0.9.0 https:

This is well timed as PRQL 0.9 was just released a few hours ago. Have a look at the release notes here: https://github.com/PRQL/prql/releases/tag/0.9.0 https://github.com/PRQL/prql/releases/tag/0.9.0 There is a rather large breaking change in the syntax from `[]` to `{}` for tuples. This is because initially it seemed like these were lists but over time we've realised that they are actually tuples. As per the release notes, freeing up `[]` clears the way to start supporting arrays soon. Disclaimer: I'm a PRQL contributor.