bkietz commented on a change in pull request #10802:
URL: https://github.com/apache/arrow/pull/10802#discussion_r680002741
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File path: cpp/src/arrow/compute/kernels/vector_selection.cc
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@@ -2146,6 +2147,144 @@ class TakeMetaFunction : public MetaFunction {
}
};
+// ----------------------------------------------------------------------
+// DropNull Implementation
+
+Result<std::shared_ptr<arrow::Array>> GetNotNullIndices(
+ const std::shared_ptr<Array>& column, MemoryPool* memory_pool) {
+ std::shared_ptr<arrow::Array> indices;
+ arrow::NumericBuilder<arrow::Int32Type> builder(memory_pool);
Review comment:
I think instead of explicitly building indices of valid bits, it'd be
more compact and performant to reuse GetTakeIndices. You can zero-copy
construct a BooleanArray which is true where `column` is valid and false where
`column` is null, then pass it to GetTakeIndices to acquire `indices`
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