ctsk opened a new pull request, #7564:
URL: https://github.com/apache/arrow-rs/pull/7564
# Rationale for this change
When converting data into row format, a significant portion of cycles is
spent determining the lengths of the rows to be created. For columns with
fixed-size elements (determined by datatype), this calculation can be optimized
by avoiding writes to an intermediate vector for length tracking.
# What changes are included in this PR?
- Implements `LengthTracker` which only materializes lengths for
variable-size columns
- Updates length calculation in `row_lengths(..)` and offset computation in
`RowConverter::append` to use the `LengthTracker`
# Are there any user-facing changes?
No.
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