alamb opened a new pull request, #3625:
URL: https://github.com/apache/arrow-rs/pull/3625
# Which issue does this PR close?
N/A
# Rationale for this change
While working on a bug downstream in DataFusion
https://github.com/apache/arrow-datafusion/issues/5104 I found myself often
confused about what the `Vec<Vec<Vec<..>>>` and other various structured
represented in parquet.
I spent a while reading the code so I figured I would encode this learning
into some more documentation to help my future sef and hopefully other readers
# What changes are included in this PR?
Doc comments about various ColumnIndex / Page Index structures.
# Are there any user-facing changes?
docstrings
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