tustvold commented on a change in pull request #1248:
URL: https://github.com/apache/arrow-rs/pull/1248#discussion_r800046847
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File path: arrow/src/compute/kernels/filter.rs
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@@ -185,79 +287,580 @@ pub fn prep_null_mask_filter(filter: &BooleanArray) ->
BooleanArray {
/// # Ok(())
/// # }
/// ```
-pub fn filter(array: &dyn Array, predicate: &BooleanArray) -> Result<ArrayRef>
{
- if predicate.null_count() > 0 {
- // this greatly simplifies subsequent filtering code
- // now we only have a boolean mask to deal with
- let predicate = prep_null_mask_filter(predicate);
- return filter(array, &predicate);
+pub fn filter(values: &dyn Array, predicate: &BooleanArray) ->
Result<ArrayRef> {
+ let predicate = FilterBuilder::new(predicate).build();
+ filter_array(values, &predicate)
+}
+
+/// Returns a new [RecordBatch] with arrays containing only values matching
the filter.
+pub fn filter_record_batch(
+ record_batch: &RecordBatch,
+ predicate: &BooleanArray,
+) -> Result<RecordBatch> {
+ let filter = FilterBuilder::new(predicate).optimize().build();
+
+ let filtered_arrays = record_batch
+ .columns()
+ .iter()
+ .map(|a| filter_array(a, &filter))
Review comment:
Good shout, I double checked and the cost of "optimizing" the filter, is
of a similar magnitude to that of the primitive array copies, and so it will be
faster to not "optimize" for a single array. Will fix :+1:
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