alamb commented on code in PR #7055:
URL: https://github.com/apache/arrow-rs/pull/7055#discussion_r2083489167
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parquet/src/arrow/array_reader/primitive_array.rs:
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@@ -261,6 +262,45 @@ where
// - date64: cast int32 to date32, then date32 to date64.
// - decimal: cast int32 to decimal, int64 to decimal
let array = match target_type {
+ // Using `arrow_cast::cast` has been found to be very slow for
converting
Review Comment:
> Several of the clickbench queries (not sure what data types, but it was
spending like 20% of samples in casting during parquet reading).
FWIW many of the clickbench columns are Int16, as I found when working on
https://github.com/apache/arrow-rs/pull/7470.
I started running some benchmarks on a draft update to parquet in this PR
(hopefully it will show some improvements)
- https://github.com/apache/datafusion/pull/16012
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