westonpace commented on code in PR #13218:
URL: https://github.com/apache/arrow/pull/13218#discussion_r888562981
##########
cpp/src/arrow/compute/exec/key_hash.h:
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@@ -45,8 +45,8 @@ class ARROW_EXPORT Hashing32 {
friend void TestBloomSmall(BloomFilterBuildStrategy, int64_t, int, bool,
bool);
public:
- static void HashMultiColumn(const std::vector<KeyColumnArray>& cols,
- KeyEncoder::KeyEncoderContext* ctx, uint32_t*
out_hash);
+ static void HashMultiColumn(const std::vector<KeyColumnArray>& cols,
LightContext* ctx,
+ uint32_t* out_hash);
Review Comment:
Yes, that is what it is. It is essentially a namespace to distinguish
between 32bit and 64bit implementations. `Hashing32::HashBatch` will hash rows
into `uint32_t` while `Hashing64::HashBatch` will hash rows into `uint64_t`.
Would a namespace be an option? (e.g. `arrow::compute::hash32::HashBatch`)
Alternatively, I suppose we could rename all the functions (e.g.
`arrow::compute::HashBatch32` and `arrow::compute::HashBatch64`).
Or we could template all the functions (e.g.
`arrow::compute::HashBatch<uint32_t>` and `arrow::compute::HashBatch<uint64_t>`)
Do we have a strong style preference here?
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