pitrou commented on code in PR #45515:
URL: https://github.com/apache/arrow/pull/45515#discussion_r1954681877
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cpp/src/arrow/compute/key_map_internal.h:
##########
@@ -81,31 +81,70 @@ class ARROW_EXPORT SwissTable {
void num_inserted(uint32_t i) { num_inserted_ = i; }
- uint8_t* blocks() const { return blocks_->mutable_data(); }
-
uint32_t* hashes() const {
return reinterpret_cast<uint32_t*>(hashes_->mutable_data());
}
/// \brief Extract group id for a given slot in a given block.
///
- inline uint64_t extract_group_id(const uint8_t* block_ptr, int slot,
- uint64_t group_id_mask) const;
+ static uint32_t extract_group_id(const uint8_t* block_ptr, int local_slot,
+ int num_group_id_bits) {
+ // Extract group id using aligned 32-bit read.
Review Comment:
Why not use `SafeLoad` as in other places already?
(also, since this is non-trivial, factoring out the loading of a group id
could go into a dedicated inline function)
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