pitrou commented on code in PR #33776:
URL: https://github.com/apache/arrow/pull/33776#discussion_r1092004195
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cpp/src/parquet/bloom_filter.cc:
##########
@@ -65,51 +69,109 @@ void BlockSplitBloomFilter::Init(const uint8_t* bitset,
uint32_t num_bytes) {
PARQUET_ASSIGN_OR_THROW(data_, ::arrow::AllocateBuffer(num_bytes_, pool_));
memcpy(data_->mutable_data(), bitset, num_bytes_);
- this->hasher_.reset(new MurmurHash3());
+ this->hasher_ = std::make_unique<XxHasher>();
}
-BlockSplitBloomFilter BlockSplitBloomFilter::Deserialize(ArrowInputStream*
input) {
- uint32_t len, hash, algorithm;
- int64_t bytes_available;
+static constexpr uint32_t kBloomFilterHeaderSizeGuess = 32;
+static constexpr uint32_t kMaxBloomFilterHeaderSize = 1024;
Review Comment:
I think this is pointless complication. We can try to read up to 256 bytes
at once, which should be sufficient for future additions.
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