Types & Metadata

This is a major release. Old queries against old backends should work without any changes. However, you'll need a new backend to take advantage of most of the new features.

Features marked with a ** require the new backend.

New Features in the language

• C++ Code injection can be done via a decorator
• List comprehension and Generator expressions are now supported, automatically turned into func_adl statements. This is particularly helpful when doing 2-object matching.
• Local and global variables are properly captured in lambda's.

New Features in the infrastructure

• Support for Query Metadata. This metadata is sent to the backend without being touched **
• Support for in-query Metadata. This metadata is not sent to the backend, but can be extracted from the query. The in-query metadata can be overridden by setting a value more than once. **
• A Fully typed ObjectStream is supported via Generics. Various editors that type-follow will be able to correctly predict methods, etc., that are available. You'll need a complete object model for this to work (see the func_adl_servicex_xaodr21 package) **
• Python 10 is supported.

The PR's

• Add a function to allow MetaData over the wire by @gordonwatts in #78
• Added typing into ObjectStream by @gordonwatts in #80
• Support Python 10 by @gordonwatts in #86
• Extensability via the type system by @gordonwatts in #82
• Pythonic Decorators for Code Injection by @gordonwatts in #87
• Support Lambda Capture by @gordonwatts in #88
• Turning on black as a formatter by @gordonwatts in #89
• Parameterized Method Calls by @gordonwatts in #90
• Pr_query_metadata by @gordonwatts in #91
• Support ListComp and Generator expressions by @gordonwatts in #92
• Fixes to get a version that runs in production by @gordonwatts in #94
• More robust parsing of ast's from callables by @gordonwatts in #97
• Regression (untested) for lambdas continuing accross lines by @gordonwatts in #98
• Calls to AsXXX with column names as single items or single arrays should be the same by @gordonwatts in #99
• Bug Fix: argument names should override captured variables by @gordonwatts in #100

Full Changelog: 2.3...3.0