tustvold opened a new pull request, #1716:
URL: https://github.com/apache/arrow-rs/pull/1716
# Which issue does this PR close?
Closes #1701.
# Rationale for this change
The current API is confusing, surfacing errors at runtime, and is liable to
accidental misuse - https://github.com/apache/arrow-datafusion/issues/2453 and
https://github.com/apache/arrow-datafusion/issues/2543.
# What changes are included in this PR?
This adds an explicit `ColumnMask` that replaces the iterators of indices.
This makes for a cleaner API that should hopefully make it harder to
accidentally misuse.
In particular it also adds the ability to construct a RecordReader based on
a mask of root columns, as opposed to leaf columns. This is the core behind
https://github.com/apache/arrow-datafusion/issues/2543
# Are there any user-facing changes?
Yes, this changes the arrow projection API
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