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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/11/02 05:06:40 UTC
[GitHub] [arrow-rs] tustvold opened a new pull request, #2999: Add buffer to ColumnLevelDecoderImpl (#2108)
tustvold opened a new pull request, #2999:
URL: https://github.com/apache/arrow-rs/pull/2999
# Which issue does this PR close?
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Part of #2108
# Rationale for this change
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Why are you proposing this change? If this is already explained clearly in the issue then this section is not needed.
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In order to eventually support skipping repetition levels, there needs to be a mechanism for reading ahead when decoding level information, as you don't know ahead of time how many levels correspond to a given row.
This PR adds such a buffer, and hooks it up for when decoding definition levels. Here it just acts as a performance optimization to avoid decoding values one at a time, but it will be vital to support skipping repetition levels.
# What changes are included in this PR?
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# Are there any user-facing changes?
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[GitHub] [arrow-rs] tustvold commented on a diff in pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
tustvold commented on code in PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#discussion_r1014596963
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -323,41 +368,153 @@ impl DefinitionLevelDecoder for ColumnLevelDecoderImpl {
) -> Result<(usize, usize)> {
let mut level_skip = 0;
let mut value_skip = 0;
- match self.decoder.as_mut().unwrap() {
- LevelDecoderInner::Packed(reader, bit_width) => {
- for _ in 0..num_levels {
- // Values are delimited by max_def_level
- if max_def_level
- == reader
- .get_value::<i16>(*bit_width as usize)
- .expect("Not enough values in Packed ColumnLevelDecoderImpl.")
- {
- value_skip += 1;
- }
- level_skip += 1;
- }
- }
- LevelDecoderInner::Rle(reader) => {
- for _ in 0..num_levels {
- if let Some(level) = reader
- .get::<i16>()
- .expect("Not enough values in Rle ColumnLevelDecoderImpl.")
- {
- // Values are delimited by max_def_level
- if level == max_def_level {
- value_skip += 1;
- }
- }
- level_skip += 1;
+ while level_skip < num_levels {
+ let remaining_levels = num_levels - level_skip;
+
+ if self.buffer.is_empty() {
+ // Only read number of needed values
+ self.read_to_buffer(remaining_levels.min(SKIP_BUFFER_SIZE))?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
}
}
+ let to_read = self.buffer.len().min(remaining_levels);
+
+ level_skip += to_read;
+ value_skip += self.buffer[..to_read]
+ .iter()
+ .filter(|x| **x == max_def_level)
+ .count();
+
+ self.split_off_buffer(to_read)
}
+
Ok((value_skip, level_skip))
}
}
impl RepetitionLevelDecoder for ColumnLevelDecoderImpl {
- fn skip_rep_levels(&mut self, _num_records: usize) -> Result<(usize, usize)> {
- Err(nyi_err!("https://github.com/apache/arrow-rs/issues/1792"))
+ fn skip_rep_levels(&mut self, num_records: usize) -> Result<(usize, usize)> {
+ let mut level_skip = 0;
+ let mut record_skip = 0;
+
+ loop {
+ if self.buffer.is_empty() {
+ // Read SKIP_BUFFER_SIZE as we don't know how many to read
+ self.read_to_buffer(SKIP_BUFFER_SIZE)?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
+ }
+ }
+
+ let mut to_skip = 0;
+ while to_skip < self.buffer.len() && record_skip != num_records {
+ if self.buffer[to_skip] == 0 {
+ record_skip += 1;
+ }
+ to_skip += 1;
+ }
+
+ // Find end of record
+ while to_skip < self.buffer.len() && self.buffer[to_skip] != 0 {
+ to_skip += 1;
+ }
+
+ level_skip += to_skip;
+ if to_skip >= self.buffer.len() {
Review Comment:
Yeah, the hope is that >= helps LLVM elide bound checks that follow. Not sure it makes any difference, just habit ๐
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[GitHub] [arrow-rs] tustvold commented on pull request #2999: Add buffer to ColumnLevelDecoderImpl (#2108)
Posted by GitBox <gi...@apache.org>.
tustvold commented on PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#issuecomment-1301091965
Will update with rep_levels support
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[GitHub] [arrow-rs] Ted-Jiang commented on pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
Ted-Jiang commented on PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#issuecomment-1303182072
I will review this carefully tomorrow morning!
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[GitHub] [arrow-rs] tustvold commented on a diff in pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
tustvold commented on code in PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#discussion_r1014596878
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -264,9 +264,13 @@ impl<T: DataType> ColumnValueDecoder for ColumnValueDecoderImpl<T> {
}
}
+const SKIP_BUFFER_SIZE: usize = 1024;
Review Comment:
It's a somewhat arbitrary number, it tries to strike a balance between small enough to not be overly wasteful but large enough that we don't end up repeatedly reading too few values
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[GitHub] [arrow-rs] Ted-Jiang commented on a diff in pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
Ted-Jiang commented on code in PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#discussion_r1014587356
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -264,9 +264,13 @@ impl<T: DataType> ColumnValueDecoder for ColumnValueDecoderImpl<T> {
}
}
+const SKIP_BUFFER_SIZE: usize = 1024;
Review Comment:
@tustvold choose `SKIP_BUFFER_SIZE: usize = 1024`, 1024* i16 just 2Kb, which supported by AVX_256, so this is the best choice ๐ค (i am not familiar with this, could you give me some inforamtion๐)
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[GitHub] [arrow-rs] tustvold commented on pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
tustvold commented on PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#issuecomment-1302883727
https://arrow.apache.org/blog/2022/10/08/arrow-parquet-encoding-part-2/ may be helpful here
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[GitHub] [arrow-rs] Ted-Jiang commented on a diff in pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
Ted-Jiang commented on code in PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#discussion_r1014578761
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -323,41 +368,153 @@ impl DefinitionLevelDecoder for ColumnLevelDecoderImpl {
) -> Result<(usize, usize)> {
let mut level_skip = 0;
let mut value_skip = 0;
- match self.decoder.as_mut().unwrap() {
- LevelDecoderInner::Packed(reader, bit_width) => {
- for _ in 0..num_levels {
- // Values are delimited by max_def_level
- if max_def_level
- == reader
- .get_value::<i16>(*bit_width as usize)
- .expect("Not enough values in Packed ColumnLevelDecoderImpl.")
- {
- value_skip += 1;
- }
- level_skip += 1;
- }
- }
- LevelDecoderInner::Rle(reader) => {
- for _ in 0..num_levels {
- if let Some(level) = reader
- .get::<i16>()
- .expect("Not enough values in Rle ColumnLevelDecoderImpl.")
- {
- // Values are delimited by max_def_level
- if level == max_def_level {
- value_skip += 1;
- }
- }
- level_skip += 1;
+ while level_skip < num_levels {
+ let remaining_levels = num_levels - level_skip;
+
+ if self.buffer.is_empty() {
+ // Only read number of needed values
+ self.read_to_buffer(remaining_levels.min(SKIP_BUFFER_SIZE))?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
}
}
+ let to_read = self.buffer.len().min(remaining_levels);
+
+ level_skip += to_read;
+ value_skip += self.buffer[..to_read]
+ .iter()
+ .filter(|x| **x == max_def_level)
+ .count();
+
+ self.split_off_buffer(to_read)
}
+
Ok((value_skip, level_skip))
}
}
impl RepetitionLevelDecoder for ColumnLevelDecoderImpl {
- fn skip_rep_levels(&mut self, _num_records: usize) -> Result<(usize, usize)> {
- Err(nyi_err!("https://github.com/apache/arrow-rs/issues/1792"))
+ fn skip_rep_levels(&mut self, num_records: usize) -> Result<(usize, usize)> {
+ let mut level_skip = 0;
+ let mut record_skip = 0;
+
+ loop {
+ if self.buffer.is_empty() {
+ // Read SKIP_BUFFER_SIZE as we don't know how many to read
Review Comment:
๐
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -323,41 +368,153 @@ impl DefinitionLevelDecoder for ColumnLevelDecoderImpl {
) -> Result<(usize, usize)> {
let mut level_skip = 0;
let mut value_skip = 0;
- match self.decoder.as_mut().unwrap() {
- LevelDecoderInner::Packed(reader, bit_width) => {
- for _ in 0..num_levels {
- // Values are delimited by max_def_level
- if max_def_level
- == reader
- .get_value::<i16>(*bit_width as usize)
- .expect("Not enough values in Packed ColumnLevelDecoderImpl.")
- {
- value_skip += 1;
- }
- level_skip += 1;
- }
- }
- LevelDecoderInner::Rle(reader) => {
- for _ in 0..num_levels {
- if let Some(level) = reader
- .get::<i16>()
- .expect("Not enough values in Rle ColumnLevelDecoderImpl.")
- {
- // Values are delimited by max_def_level
- if level == max_def_level {
- value_skip += 1;
- }
- }
- level_skip += 1;
+ while level_skip < num_levels {
+ let remaining_levels = num_levels - level_skip;
+
+ if self.buffer.is_empty() {
+ // Only read number of needed values
+ self.read_to_buffer(remaining_levels.min(SKIP_BUFFER_SIZE))?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
}
}
+ let to_read = self.buffer.len().min(remaining_levels);
+
+ level_skip += to_read;
+ value_skip += self.buffer[..to_read]
+ .iter()
+ .filter(|x| **x == max_def_level)
+ .count();
+
+ self.split_off_buffer(to_read)
}
+
Ok((value_skip, level_skip))
}
}
impl RepetitionLevelDecoder for ColumnLevelDecoderImpl {
- fn skip_rep_levels(&mut self, _num_records: usize) -> Result<(usize, usize)> {
- Err(nyi_err!("https://github.com/apache/arrow-rs/issues/1792"))
+ fn skip_rep_levels(&mut self, num_records: usize) -> Result<(usize, usize)> {
+ let mut level_skip = 0;
+ let mut record_skip = 0;
+
+ loop {
+ if self.buffer.is_empty() {
+ // Read SKIP_BUFFER_SIZE as we don't know how many to read
+ self.read_to_buffer(SKIP_BUFFER_SIZE)?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
+ }
+ }
+
+ let mut to_skip = 0;
+ while to_skip < self.buffer.len() && record_skip != num_records {
+ if self.buffer[to_skip] == 0 {
+ record_skip += 1;
+ }
+ to_skip += 1;
+ }
+
+ // Find end of record
+ while to_skip < self.buffer.len() && self.buffer[to_skip] != 0 {
+ to_skip += 1;
+ }
+
+ level_skip += to_skip;
+ if to_skip >= self.buffer.len() {
+ // Need to to read more values
+ self.buffer.clear();
+ continue;
+ }
+
+ self.split_off_buffer(to_skip);
+ break;
+ }
+
+ Ok((record_skip, level_skip))
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+ use crate::encodings::rle::RleEncoder;
+ use rand::prelude::*;
+
+ fn test_skip_levels<F>(encoded: &[i16], data: ByteBufferPtr, skip: F)
+ where
+ F: Fn(&mut ColumnLevelDecoderImpl, &mut usize, usize),
+ {
+ let mut rng = thread_rng();
+ let mut decoder = ColumnLevelDecoderImpl::new(5);
+ decoder.set_data(Encoding::RLE, data);
+
+ let mut read = 0;
+ let mut decoded = vec![];
+ let mut expected = vec![];
+ while read < encoded.len() {
Review Comment:
Nice fuzz tests ! ๐
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -305,12 +337,25 @@ impl ColumnLevelDecoder for ColumnLevelDecoderImpl {
}
}
- fn read(&mut self, out: &mut Self::Slice, range: Range<usize>) -> Result<usize> {
+ fn read(&mut self, out: &mut Self::Slice, mut range: Range<usize>) -> Result<usize> {
+ let read_from_buffer = match self.buffer.is_empty() {
Review Comment:
๐
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -323,41 +368,153 @@ impl DefinitionLevelDecoder for ColumnLevelDecoderImpl {
) -> Result<(usize, usize)> {
let mut level_skip = 0;
let mut value_skip = 0;
- match self.decoder.as_mut().unwrap() {
- LevelDecoderInner::Packed(reader, bit_width) => {
- for _ in 0..num_levels {
- // Values are delimited by max_def_level
- if max_def_level
- == reader
- .get_value::<i16>(*bit_width as usize)
- .expect("Not enough values in Packed ColumnLevelDecoderImpl.")
- {
- value_skip += 1;
- }
- level_skip += 1;
- }
- }
- LevelDecoderInner::Rle(reader) => {
- for _ in 0..num_levels {
- if let Some(level) = reader
- .get::<i16>()
- .expect("Not enough values in Rle ColumnLevelDecoderImpl.")
- {
- // Values are delimited by max_def_level
- if level == max_def_level {
- value_skip += 1;
- }
- }
- level_skip += 1;
+ while level_skip < num_levels {
+ let remaining_levels = num_levels - level_skip;
+
+ if self.buffer.is_empty() {
+ // Only read number of needed values
+ self.read_to_buffer(remaining_levels.min(SKIP_BUFFER_SIZE))?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
}
}
+ let to_read = self.buffer.len().min(remaining_levels);
+
+ level_skip += to_read;
+ value_skip += self.buffer[..to_read]
+ .iter()
+ .filter(|x| **x == max_def_level)
+ .count();
+
+ self.split_off_buffer(to_read)
}
+
Ok((value_skip, level_skip))
}
}
impl RepetitionLevelDecoder for ColumnLevelDecoderImpl {
- fn skip_rep_levels(&mut self, _num_records: usize) -> Result<(usize, usize)> {
- Err(nyi_err!("https://github.com/apache/arrow-rs/issues/1792"))
+ fn skip_rep_levels(&mut self, num_records: usize) -> Result<(usize, usize)> {
+ let mut level_skip = 0;
+ let mut record_skip = 0;
+
+ loop {
+ if self.buffer.is_empty() {
+ // Read SKIP_BUFFER_SIZE as we don't know how many to read
+ self.read_to_buffer(SKIP_BUFFER_SIZE)?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
+ }
+ }
+
+ let mut to_skip = 0;
+ while to_skip < self.buffer.len() && record_skip != num_records {
+ if self.buffer[to_skip] == 0 {
+ record_skip += 1;
+ }
+ to_skip += 1;
+ }
+
+ // Find end of record
+ while to_skip < self.buffer.len() && self.buffer[to_skip] != 0 {
+ to_skip += 1;
Review Comment:
Nice check !
##########
parquet/src/column/reader/decoder.rs:
##########
@@ -323,41 +368,153 @@ impl DefinitionLevelDecoder for ColumnLevelDecoderImpl {
) -> Result<(usize, usize)> {
let mut level_skip = 0;
let mut value_skip = 0;
- match self.decoder.as_mut().unwrap() {
- LevelDecoderInner::Packed(reader, bit_width) => {
- for _ in 0..num_levels {
- // Values are delimited by max_def_level
- if max_def_level
- == reader
- .get_value::<i16>(*bit_width as usize)
- .expect("Not enough values in Packed ColumnLevelDecoderImpl.")
- {
- value_skip += 1;
- }
- level_skip += 1;
- }
- }
- LevelDecoderInner::Rle(reader) => {
- for _ in 0..num_levels {
- if let Some(level) = reader
- .get::<i16>()
- .expect("Not enough values in Rle ColumnLevelDecoderImpl.")
- {
- // Values are delimited by max_def_level
- if level == max_def_level {
- value_skip += 1;
- }
- }
- level_skip += 1;
+ while level_skip < num_levels {
+ let remaining_levels = num_levels - level_skip;
+
+ if self.buffer.is_empty() {
+ // Only read number of needed values
+ self.read_to_buffer(remaining_levels.min(SKIP_BUFFER_SIZE))?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
}
}
+ let to_read = self.buffer.len().min(remaining_levels);
+
+ level_skip += to_read;
+ value_skip += self.buffer[..to_read]
+ .iter()
+ .filter(|x| **x == max_def_level)
+ .count();
+
+ self.split_off_buffer(to_read)
}
+
Ok((value_skip, level_skip))
}
}
impl RepetitionLevelDecoder for ColumnLevelDecoderImpl {
- fn skip_rep_levels(&mut self, _num_records: usize) -> Result<(usize, usize)> {
- Err(nyi_err!("https://github.com/apache/arrow-rs/issues/1792"))
+ fn skip_rep_levels(&mut self, num_records: usize) -> Result<(usize, usize)> {
+ let mut level_skip = 0;
+ let mut record_skip = 0;
+
+ loop {
+ if self.buffer.is_empty() {
+ // Read SKIP_BUFFER_SIZE as we don't know how many to read
+ self.read_to_buffer(SKIP_BUFFER_SIZE)?;
+ if self.buffer.is_empty() {
+ // Reached end of page
+ break;
+ }
+ }
+
+ let mut to_skip = 0;
+ while to_skip < self.buffer.len() && record_skip != num_records {
+ if self.buffer[to_skip] == 0 {
+ record_skip += 1;
+ }
+ to_skip += 1;
+ }
+
+ // Find end of record
+ while to_skip < self.buffer.len() && self.buffer[to_skip] != 0 {
+ to_skip += 1;
+ }
+
+ level_skip += to_skip;
+ if to_skip >= self.buffer.len() {
Review Comment:
I think here only need `==`
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[GitHub] [arrow-rs] ursabot commented on pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
ursabot commented on PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999#issuecomment-1304644062
Benchmark runs are scheduled for baseline = fc58036e77510de71b51c0190acfd629738afff8 and contender = e2c419953504bfc09d99436dc271ac446d216ac8. e2c419953504bfc09d99436dc271ac446d216ac8 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] [ec2-t3-xlarge-us-east-2](https://conbench.ursa.dev/compare/runs/ddbdca9626bd44e6895638067b9f7c38...d051d7540ee344ad99174e366bbd89b2/)
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on test-mac-arm] [test-mac-arm](https://conbench.ursa.dev/compare/runs/d7d5209c6100421f9c13802e57df8d4c...3cc9a358019248b4a0b5ea661585c206/)
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] [ursa-i9-9960x](https://conbench.ursa.dev/compare/runs/87d35f3bc14a4a5b8ef3d471513cf9a6...a7fc47af30334e5c8fd37cd9fc00354a/)
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] [ursa-thinkcentre-m75q](https://conbench.ursa.dev/compare/runs/2903e4015cbe481bb66904411347bba8...0d65aeed62f942f6b2787050aef10a37/)
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java
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[GitHub] [arrow-rs] tustvold merged pull request #2999: Support Predicate Pushdown for Parquet Lists (#2108)
Posted by GitBox <gi...@apache.org>.
tustvold merged PR #2999:
URL: https://github.com/apache/arrow-rs/pull/2999
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