zhixingheyi-tian commented on code in PR #14353:
URL: https://github.com/apache/arrow/pull/14353#discussion_r1051755382
##########
cpp/src/parquet/column_reader.cc:
##########
@@ -1957,6 +1970,139 @@ class ByteArrayChunkedRecordReader : public
TypedRecordReader<ByteArrayType>,
typename EncodingTraits<ByteArrayType>::Accumulator accumulator_;
};
+class ByteArrayChunkedOptRecordReader : public
TypedRecordReader<ByteArrayType>,
+ virtual public BinaryRecordReader {
+ public:
+ ByteArrayChunkedOptRecordReader(const ColumnDescriptor* descr, LevelInfo
leaf_info,
+ ::arrow::MemoryPool* pool)
+ : TypedRecordReader<ByteArrayType>(descr, leaf_info, pool) {
+ DCHECK_EQ(descr_->physical_type(), Type::BYTE_ARRAY);
+ accumulator_.builder.reset(new ::arrow::BinaryBuilder(pool));
+ values_ = AllocateBuffer(pool);
+ offset_ = AllocateBuffer(pool);
+ }
+
+ ::arrow::ArrayVector GetBuilderChunks() override {
+ if (uses_opt_) {
+ std::vector<std::shared_ptr<Buffer>> buffers = {ReleaseIsValid(),
ReleaseOffsets(),
+ ReleaseValues()};
+ auto data = std::make_shared<::arrow::ArrayData>(
+ ::arrow::binary(), values_written(), buffers, null_count());
+
+ auto chunks = ::arrow::ArrayVector({::arrow::MakeArray(data)});
+ return chunks;
+ } else {
+ ::arrow::ArrayVector result = accumulator_.chunks;
+ if (result.size() == 0 || accumulator_.builder->length() > 0) {
+ std::shared_ptr<::arrow::Array> last_chunk;
+ PARQUET_THROW_NOT_OK(accumulator_.builder->Finish(&last_chunk));
+ result.push_back(std::move(last_chunk));
+ }
+ accumulator_.chunks = {};
+ return result;
Review Comment:
The optimized RecordReader implementation is ByteArrayChunkedOptRecordReader
https://github.com/zhixingheyi-tian/arrow/blob/8d611c673d3ed23abfa32f50da3cc4c4e4feb807/cpp/src/parquet/column_reader.cc#L2203-L2206
And is just for Binary/String/LargeBinary/LargeString types.
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