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Fix gtest column utility comparator diff reporting #12995

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Mar 24, 2023
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16 changes: 10 additions & 6 deletions cpp/tests/utilities/column_utilities.cu
Original file line number Diff line number Diff line change
Expand Up @@ -543,7 +543,7 @@ struct column_comparator_impl {

auto const comparator = cudf::experimental::row::equality::two_table_comparator{
lhs_tview, rhs_tview, cudf::get_default_stream()};
auto const has_nulls = cudf::has_nested_nulls(lhs_tview) or cudf::has_nested_nulls(rhs_tview);
auto const has_nulls = cudf::has_nulls(lhs_tview) or cudf::has_nulls(rhs_tview);

auto const device_comparator = comparator.equal_to<false>(cudf::nullate::DYNAMIC{has_nulls});

Expand All @@ -556,18 +556,22 @@ struct column_comparator_impl {
lhs_row_indices.size(), cudf::get_default_stream()); // worst case: everything different
auto input_iter = thrust::make_counting_iterator(0);

auto diff_map = rmm::device_uvector<bool>(lhs_row_indices.size(), cudf::get_default_stream());

thrust::transform(
rmm::exec_policy(cudf::get_default_stream()),
input_iter,
input_iter + lhs_row_indices.size(),
differences.begin(),
diff_map.begin(),
ComparatorType(
*d_lhs_row_indices, *d_rhs_row_indices, fp_ulps, device_comparator, *d_lhs, *d_rhs));

auto diff_iter = thrust::remove(rmm::exec_policy(cudf::get_default_stream()),
differences.begin(),
differences.end(),
0); // remove the zero entries
auto diff_iter = thrust::copy_if(rmm::exec_policy(cudf::get_default_stream()),
input_iter,
input_iter + lhs_row_indices.size(),
diff_map.begin(),
differences.begin(),
thrust::identity<bool>{});

differences.resize(thrust::distance(differences.begin(), diff_iter),
cudf::get_default_stream()); // shrink back down
Expand Down