Kelvinyu1117 commented on code in PR #131: URL: https://github.com/apache/fluss-rust/pull/131#discussion_r2678421357
########## crates/fluss/src/row/compacted/compacted_row.rs: ########## @@ -0,0 +1,343 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::sync::Arc; + +use bytes::Bytes; + +use crate::metadata::DataType; +use crate::row::compacted::compacted_row_reader::{CompactedRowDeserializer, CompactedRowReader}; +use crate::row::{GenericRow, InternalRow}; + +// Reference implementation: +// https://github.com/apache/fluss/blob/main/fluss-common/src/main/java/org/apache/fluss/row/compacted/CompactedRow.java +#[allow(dead_code)] +pub struct CompactedRow { + arity: usize, + segment: Bytes, + offset: usize, + size_in_bytes: usize, + decoded: bool, + decoded_row: Option<GenericRow<'static>>, + reader: Option<CompactedRowReader>, Review Comment: fixed. ########## crates/fluss/src/row/compacted/compacted_row.rs: ########## @@ -0,0 +1,343 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::sync::Arc; + +use bytes::Bytes; + +use crate::metadata::DataType; +use crate::row::compacted::compacted_row_reader::{CompactedRowDeserializer, CompactedRowReader}; +use crate::row::{GenericRow, InternalRow}; + +// Reference implementation: +// https://github.com/apache/fluss/blob/main/fluss-common/src/main/java/org/apache/fluss/row/compacted/CompactedRow.java +#[allow(dead_code)] +pub struct CompactedRow { + arity: usize, + segment: Bytes, + offset: usize, + size_in_bytes: usize, + decoded: bool, + decoded_row: Option<GenericRow<'static>>, + reader: Option<CompactedRowReader>, + deserializer: Arc<CompactedRowDeserializer>, +} + +#[allow(dead_code)] +impl CompactedRow { + pub fn calculate_bit_set_width_in_bytes(arity: usize) -> usize { + arity.div_ceil(8) + } + + pub fn new(types: Vec<DataType>) -> Self { + let arity = types.len(); + Self { + arity, + segment: Bytes::new(), + offset: 0, + size_in_bytes: 0, + decoded: false, + decoded_row: None, + reader: None, + deserializer: Arc::new(CompactedRowDeserializer::new(types)), + } + } + + pub fn from_bytes(types: Vec<DataType>, data: Bytes) -> Self { + let arity = types.len(); + let size = data.len(); + Self { + arity, + segment: data, + offset: 0, + size_in_bytes: size, + decoded: false, + decoded_row: None, + reader: None, + deserializer: Arc::new(CompactedRowDeserializer::new(types)), + } + } + + pub fn point_to(&mut self, segment: Bytes, offset: usize, size_in_bytes: usize) { + self.segment = segment; + self.offset = offset; + self.size_in_bytes = size_in_bytes; + self.decoded = false; + } + + pub fn get_segment(&self) -> &Bytes { + &self.segment + } + + pub fn get_offset(&self) -> usize { + self.offset + } + + pub fn get_size_in_bytes(&self) -> usize { + self.size_in_bytes + } + + pub fn get_field_count(&self) -> usize { + self.arity + } + + pub fn is_null_at(&self, pos: usize) -> bool { + let byte_index = pos >> 3; + let bit = pos & 7; + let idx = self.offset + byte_index; + (self.segment[idx] & (1u8 << bit)) != 0 + } + + fn decoded_row(&mut self) -> &GenericRow<'static> { + if !self.decoded { + if self.reader.is_none() { + self.reader = Some(CompactedRowReader::new(self.arity)); + } + + let reader = self.reader.as_mut().expect("reader should be initialized"); + reader.point_to(self.segment.clone(), self.offset, self.size_in_bytes); + + self.decoded_row = Some(self.deserializer.deserialize(reader)); + self.decoded = true; + } + self.decoded_row + .as_ref() + .expect("decoded_row should be set") + } + + pub fn get_boolean(&mut self, pos: usize) -> bool { + self.decoded_row().get_boolean(pos) + } + + pub fn get_byte(&mut self, pos: usize) -> i8 { + self.decoded_row().get_byte(pos) + } + + pub fn get_short(&mut self, pos: usize) -> i16 { + self.decoded_row().get_short(pos) + } + + pub fn get_int(&mut self, pos: usize) -> i32 { + self.decoded_row().get_int(pos) + } + + pub fn get_long(&mut self, pos: usize) -> i64 { + self.decoded_row().get_long(pos) + } + + pub fn get_float(&mut self, pos: usize) -> f32 { + self.decoded_row().get_float(pos) + } + + pub fn get_double(&mut self, pos: usize) -> f64 { + self.decoded_row().get_double(pos) + } + + pub fn get_string(&mut self, pos: usize) -> &str { + self.decoded_row().get_string(pos) + } + + pub fn get_bytes(&mut self, pos: usize) -> &[u8] { + self.decoded_row().get_bytes(pos) + } +} + +#[cfg(test)] +mod tests { + use super::*; + use crate::metadata::{ + BigIntType, BooleanType, BytesType, DoubleType, FloatType, IntType, SmallIntType, + StringType, TinyIntType, + }; + use crate::row::compacted::compacted_row_writer::CompactedRowWriter; + + #[test] + fn test_basic_types() { Review Comment: fixed. ########## crates/fluss/src/row/compacted/compacted_row_reader.rs: ########## @@ -0,0 +1,217 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use bytes::Bytes; + +use crate::{ + metadata::DataType, + row::{ + Datum, GenericRow, + compacted::{compacted_row::CompactedRow, compacted_row_writer::CompactedRowWriter}, + }, +}; + +#[allow(dead_code)] +pub struct CompactedRowDeserializer { + schema: Vec<DataType>, +} + +#[allow(dead_code)] +impl CompactedRowDeserializer { + pub fn new(schema: Vec<DataType>) -> Self { + Self { schema } + } + + pub fn deserialize(&self, reader: &mut CompactedRowReader) -> GenericRow<'static> { + let mut row = GenericRow::new(); + for (pos, dtype) in self.schema.iter().enumerate() { + if reader.is_null_at(pos) { + row.set_field(pos, Datum::Null); + continue; + } + let datum = match dtype { + DataType::Boolean(_) => Datum::Bool(reader.read_boolean()), + DataType::TinyInt(_) => Datum::Int8(reader.read_byte() as i8), + DataType::SmallInt(_) => Datum::Int16(reader.read_short()), + DataType::Int(_) => Datum::Int32(reader.read_int()), + DataType::BigInt(_) => Datum::Int64(reader.read_long()), + DataType::Float(_) => Datum::Float32(reader.read_float().into()), + DataType::Double(_) => Datum::Float64(reader.read_double().into()), + // TODO: use read_char(length) in the future, but need to keep compatibility + DataType::Char(_) | DataType::String(_) => Datum::OwnedString(reader.read_string()), + // TODO: use read_binary(length) in the future, but need to keep compatibility + DataType::Bytes(_) | DataType::Binary(_) => { + Datum::Blob(reader.read_bytes().into_vec().into()) + } + _ => panic!("unsupported DataType in CompactedRowDeserializer"), + }; + row.set_field(pos, datum); + } + row + } +} + +// Reference implementation: +// https://github.com/apache/fluss/blob/main/fluss-common/src/main/java/org/apache/fluss/row/compacted/CompactedRowReader.java +#[allow(dead_code)] +pub struct CompactedRowReader { + segment: Bytes, + offset: usize, + position: usize, + limit: usize, + header_size_in_bytes: usize, +} + +#[allow(dead_code)] +impl CompactedRowReader { + pub fn new(field_count: usize) -> Self { + let header = CompactedRow::calculate_bit_set_width_in_bytes(field_count); + Self { + header_size_in_bytes: header, + segment: Bytes::new(), + offset: 0, + position: 0, + limit: 0, + } + } + + pub fn point_to(&mut self, data: Bytes, offset: usize, length: usize) { + let limit = offset + length; + let position = offset + self.header_size_in_bytes; + + debug_assert!(limit <= data.len()); + debug_assert!(position <= limit); + + self.segment = data; + self.offset = offset; + self.position = position; + self.limit = limit; + } + + pub fn is_null_at(&self, pos: usize) -> bool { + let byte_index = pos >> 3; + let bit = pos & 7; + debug_assert!(byte_index < self.header_size_in_bytes); + let idx = self.offset + byte_index; + (self.segment[idx] & (1u8 << bit)) != 0 + } + + pub fn read_boolean(&mut self) -> bool { + self.read_byte() != 0 + } + + pub fn read_byte(&mut self) -> u8 { + debug_assert!(self.position < self.limit); + let b = self.segment[self.position]; + self.position += 1; + b + } + + pub fn read_short(&mut self) -> i16 { + debug_assert!(self.position + 2 <= self.limit); + let bytes_slice = &self.segment[self.position..self.position + 2]; + let byte_array: [u8; 2] = bytes_slice + .try_into() + .expect("Slice must be exactly 2 bytes long"); + + self.position += 2; + i16::from_ne_bytes(byte_array) + } + + pub fn read_int(&mut self) -> i32 { + let mut result: u32 = 0; + let mut shift = 0; + + for _ in 0..CompactedRowWriter::MAX_INT_SIZE { + let b = self.read_byte(); + result |= ((b & 0x7F) as u32) << shift; + if (b & 0x80) == 0 { + return result as i32; + } + shift += 7; + } + + panic!("Invalid input stream."); + } + + pub fn read_long(&mut self) -> i64 { + let mut result: u64 = 0; + let mut shift = 0; + + for _ in 0..CompactedRowWriter::MAX_LONG_SIZE { + let b = self.read_byte(); + result |= ((b & 0x7F) as u64) << shift; + if (b & 0x80) == 0 { + return result as i64; + } + shift += 7; + } + + panic!("Invalid input stream."); + } + + pub fn read_float(&mut self) -> f32 { + debug_assert!(self.position + 4 <= self.limit); + let bytes_slice = &self.segment[self.position..self.position + 4]; + let byte_array: [u8; 4] = bytes_slice + .try_into() + .expect("Slice must be exactly 4 bytes long"); + + self.position += 4; + f32::from_ne_bytes(byte_array) + } + + pub fn read_double(&mut self) -> f64 { + debug_assert!(self.position + 8 <= self.limit); + let bytes_slice = &self.segment[self.position..self.position + 8]; + let byte_array: [u8; 8] = bytes_slice + .try_into() + .expect("Slice must be exactly 8 bytes long"); + + self.position += 8; + f64::from_ne_bytes(byte_array) + } + + pub fn read_binary(&mut self, length: usize) -> Bytes { + debug_assert!(self.position + length <= self.limit); + + let start = self.position; + let end = start + length; + self.position = end; + + self.segment.slice(start..end) + } + + pub fn read_bytes(&mut self) -> Box<[u8]> { + let len = self.read_int(); + debug_assert!(len >= 0); + + let len = len as usize; + debug_assert!(self.position + len <= self.limit); + + let start = self.position; + let end = start + len; + self.position = end; + + self.segment[start..end].to_vec().into_boxed_slice() + } + + pub fn read_string(&mut self) -> String { + let bytes = self.read_bytes(); + String::from_utf8(bytes.into_vec()).expect("invalid utf8") Review Comment: fixed. -- This is an automated message from the Apache Git Service. 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