pepijnve commented on code in PR #19444:
URL: https://github.com/apache/datafusion/pull/19444#discussion_r2639868657
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datafusion/physical-plan/src/spill/mod.rs:
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@@ -339,6 +339,97 @@ fn get_max_alignment_for_schema(schema: &Schema) -> usize {
max_alignment
}
+#[cfg(test)]
+const VIEW_SIZE_BYTES: usize = 16;
+#[cfg(test)]
+const INLINE_THRESHOLD: usize = 12;
+
+/// Performs garbage collection on view arrays before spilling.
+pub(crate) fn gc_view_arrays(batch: &RecordBatch) -> Result<RecordBatch> {
+ let mut new_columns: Vec<Arc<dyn Array>> =
Vec::with_capacity(batch.num_columns());
+ let mut any_gc_performed = false;
+
+ for array in batch.columns() {
+ let gc_array = match array.data_type() {
+ arrow::datatypes::DataType::Utf8View => {
+ let string_view = array
+ .as_any()
+ .downcast_ref::<StringViewArray>()
+ .expect("Utf8View array should downcast to
StringViewArray");
+ if should_gc_view_array(string_view.len(),
string_view.data_buffers()) {
+ any_gc_performed = true;
+ Arc::new(string_view.gc()) as Arc<dyn Array>
+ } else {
+ Arc::clone(array)
+ }
+ }
+ arrow::datatypes::DataType::BinaryView => {
+ let binary_view = array
+ .as_any()
+ .downcast_ref::<BinaryViewArray>()
+ .expect("BinaryView array should downcast to
BinaryViewArray");
+ if should_gc_view_array(binary_view.len(),
binary_view.data_buffers()) {
+ any_gc_performed = true;
+ Arc::new(binary_view.gc()) as Arc<dyn Array>
+ } else {
+ Arc::clone(array)
+ }
+ }
+ _ => Arc::clone(array),
+ };
+ new_columns.push(gc_array);
+ }
+
+ if any_gc_performed {
+ Ok(RecordBatch::try_new(batch.schema(), new_columns)?)
+ } else {
+ Ok(batch.clone())
+ }
+}
+
+fn should_gc_view_array(len: usize, data_buffers: &[arrow::buffer::Buffer]) ->
bool {
+ if len < 10 {
Review Comment:
Is the number of rows a useful heuristic to not GC? Even if there are few
rows, the data buffer may still be large.
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