Dandandan commented on code in PR #7650:
URL: https://github.com/apache/arrow-rs/pull/7650#discussion_r2148839141
##########
arrow-select/src/coalesce.rs:
##########
@@ -222,122 +249,339 @@ impl BatchCoalescer {
}
}
-/// Heuristically compact `StringViewArray`s to reduce memory usage, if needed
-///
-/// Decides when to consolidate the StringView into a new buffer to reduce
-/// memory usage and improve string locality for better performance.
-///
-/// This differs from `StringViewArray::gc` because:
-/// 1. It may not compact the array depending on a heuristic.
-/// 2. It uses a precise block size to reduce the number of buffers to track.
-///
-/// # Heuristic
+/// Return a new `InProgressArray` for the given data type
+fn create_in_progress_array(data_type: &DataType, batch_size: usize) ->
Box<dyn InProgressArray> {
Review Comment:
For using it in DataFusion (https://github.com/apache/datafusion/pull/16249)
this needs to be Send + Sync.
##########
arrow-select/src/coalesce.rs:
##########
@@ -222,122 +249,339 @@ impl BatchCoalescer {
}
}
-/// Heuristically compact `StringViewArray`s to reduce memory usage, if needed
-///
-/// Decides when to consolidate the StringView into a new buffer to reduce
-/// memory usage and improve string locality for better performance.
-///
-/// This differs from `StringViewArray::gc` because:
-/// 1. It may not compact the array depending on a heuristic.
-/// 2. It uses a precise block size to reduce the number of buffers to track.
-///
-/// # Heuristic
+/// Return a new `InProgressArray` for the given data type
+fn create_in_progress_array(data_type: &DataType, batch_size: usize) ->
Box<dyn InProgressArray> {
Review Comment:
For using it in DataFusion (https://github.com/apache/datafusion/pull/16249)
this needs to be Send + Sync.
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