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Remove implicit copy due to conversion from cudf::size_type and size_t #10045

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merged 3 commits into from
Jan 18, 2022
Merged

Remove implicit copy due to conversion from cudf::size_type and size_t #10045

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d5f24f6
Remove implicit copy due to conversion from cudf::size_type and size_t
robertmaynard Jan 13, 2022
539a422
Merge branch 'branch-22.02' into bug/orc_dont_take_temp_by_ref
robertmaynard Jan 14, 2022
a433e4a
Merge branch 'branch-22.02' into bug/orc_dont_take_temp_by_ref
robertmaynard Jan 18, 2022
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5 changes: 3 additions & 2 deletions cpp/src/io/orc/aggregate_orc_metadata.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -171,8 +171,9 @@ std::vector<metadata::stripe_source_mapping> aggregate_orc_metadata::select_stri

// Coalesce stripe info at the source file later since that makes downstream processing much
// easier in impl::read
for (const size_t& stripe_idx : user_specified_stripes[src_file_idx]) {
CUDF_EXPECTS(stripe_idx < per_file_metadata[src_file_idx].ff.stripes.size(),
for (const auto& stripe_idx : user_specified_stripes[src_file_idx]) {
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Just small nit:

Suggested change
for (const auto& stripe_idx : user_specified_stripes[src_file_idx]) {
for (const auto stripe_idx : user_specified_stripes[src_file_idx]) {

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@ttnghia Can you explain why you're suggesting this change?

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@ttnghia ttnghia Jan 19, 2022 •
edited
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Sorry @bdice for late reply (I didn't see this).
A reference is similar to pointer, which is 64 bits. If you use reference for 32 bits numbers, that's kind of inefficient. Although the compiler can optimize this and generate the same code (for references and without references), it is still logically inefficient.

CUDF_EXPECTS(stripe_idx < static_cast<decltype(stripe_idx)>(
per_file_metadata[src_file_idx].ff.stripes.size()),
"Invalid stripe index");
stripe_infos.push_back(
std::make_pair(&per_file_metadata[src_file_idx].ff.stripes[stripe_idx], nullptr));
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