pitrou commented on code in PR #13215:
URL: https://github.com/apache/arrow/pull/13215#discussion_r884302822
##########
cpp/src/arrow/compute/exec/ir_consumer.cc:
##########
@@ -152,14 +152,14 @@ struct ConvertLiteralImpl {
switch (t.id()) {
case Type::DECIMAL128: {
std::array<uint64_t, 2> little_endian;
- std::memcpy(little_endian.data(), lit->value(), lit->value()->size());
+ std::memcpy(little_endian.data(), lit->value()->data(),
lit->value()->size());
Review Comment:
This still seems incorrect. `little_endian` is default-initialized but, as
the `std::array` docs
[note](https://en.cppreference.com/w/cpp/container/array),
> default initialization may result in indeterminate values for non-class T
... meaning that unless `lit->value->size()` is large enough, some decimal
data may still be incorrect.
@bkietz Am I wrong?
##########
cpp/src/arrow/compute/exec/ir_consumer.cc:
##########
@@ -152,14 +152,14 @@ struct ConvertLiteralImpl {
switch (t.id()) {
case Type::DECIMAL128: {
std::array<uint64_t, 2> little_endian;
- std::memcpy(little_endian.data(), lit->value(), lit->value()->size());
+ std::memcpy(little_endian.data(), lit->value()->data(),
lit->value()->size());
Review Comment:
This still seems incorrect. `little_endian` is default-initialized but, as
the `std::array` docs
[note](https://en.cppreference.com/w/cpp/container/array),
> default initialization may result in indeterminate values for non-class T
... meaning that unless `lit->value->size()` is large enough, some decimal
data may still be undefined.
@bkietz Am I wrong?
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