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@max-sixty max-sixty released this 30 Nov 07:18
· 2628 commits to main since this release
0.3.0
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Learn about vigilant mode.

🎉 0.3.0 is the biggest ever change in PRQL's compiler 🎉. It rewrites much of the internals: the compiler now has a semantic understanding of expressions, including resolving names & building a DAG of column lineage.

While the immediate changes to the language are modest — some long-running bugs are fixed — this unlocks beginning development of many of the broad features we've had ambitions for, such as type-checking & auto-complete. And it simplifies building our next language features, such as match-case expressions, unions & table expressions.

@aljazerzen has (mostly single-handedly) done this work over the past few months. The project owes him immense appreciation.

Breaking changes:

We've had to make some modest breaking changes for 0.3:

  • Pipelines must start with from. For example, a pipeline with only derive foo = 5, with no from transform, is no longer valid. Depending on demand for this feature, it would be possible to add this back.

  • Shared column names now require == in a join. For example:

    from employees
-join positions [id]
+join positions [==id]

    The existing approach is ambiguous to the compiler — id could be a boolean column.

  • Table references containing periods must be surrounded by backticks. For example, when referencing a schema name:

    -from public.sometable
+from `public.sometable`

Features:

Fixes:

Documentation:

Internal changes:

Contributors

max-sixty and aljazerzen
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