yordan-pavlov commented on a change in pull request #1248:
URL: https://github.com/apache/arrow-rs/pull/1248#discussion_r795981104
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File path: arrow/src/compute/kernels/filter.rs
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@@ -247,65 +246,399 @@ 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))
+ .collect::<Result<Vec<_>>>()?;
+
+ RecordBatch::try_new(record_batch.schema(), filtered_arrays)
+}
+
+/// A builder to construct [`FilterPredicate`]
+#[derive(Debug)]
+pub struct FilterBuilder {
+ filter: BooleanArray,
+ count: usize,
+ iterator: FilterIterator,
+}
+
+impl FilterBuilder {
+ /// Create a new [`FilterBuilder`] that can be used construct
[`FilterPredicate`]
Review comment:
this probably should read: `... that can be used TO construct A
FilterPredicate`
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