zanmato1984 commented on code in PR #45515:
URL: https://github.com/apache/arrow/pull/45515#discussion_r1954742183
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cpp/src/arrow/compute/key_map_internal.h:
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@@ -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:
The original code uses aligned read + masking so I'm following it, possibly
for performance sake I guess?
If `SafeLoad` is preferred (i.e., it doesn't hurt performance), then yes it
is possible to factor this piece of code out.
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