Support skip_values in ColumnValueDecoderImpl #2089

thinkharderdev · 2022-07-16T12:26:40Z

Which issue does this PR close?

Closes #2078

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

thinkharderdev · 2022-07-16T12:28:51Z

parquet/src/encodings/decoding.rs

    fn values_left(&self) -> usize {
        self.values_left
    }

    fn encoding(&self) -> Encoding {
        Encoding::DELTA_BINARY_PACKED
    }
+
+    fn skip(&mut self, num_values: usize) -> Result<usize> {
+        let mut buffer = vec![T::T::default(); num_values];


This seems to kind of defeat the purpose but not sure how to skip delta encoded values without it....

thinkharderdev · 2022-07-16T12:29:05Z

parquet/src/encodings/decoding.rs

@@ -922,6 +974,11 @@ impl<T: DataType> Decoder<T> for DeltaByteArrayDecoder<T> {
    fn encoding(&self) -> Encoding {
        Encoding::DELTA_BYTE_ARRAY
    }
+
+    fn skip(&mut self, num_values: usize) -> Result<usize> {
+        let mut buffer = vec![T::T::default(); num_values];


thinkharderdev · 2022-07-16T12:29:33Z

@Ted-Jiang

codecov-commenter · 2022-07-16T13:13:24Z

Codecov Report

Merging #2089 (7657f96) into master (72dada6) will increase coverage by 0.03%.
The diff coverage is 86.59%.

@@            Coverage Diff             @@
##           master    #2089      +/-   ##
==========================================
+ Coverage   83.70%   83.73%   +0.03%     
==========================================
  Files         224      224              
  Lines       58958    59391     +433     
==========================================
+ Hits        49350    49734     +384     
- Misses       9608     9657      +49

Impacted Files	Coverage Δ
parquet/src/column/reader/decoder.rs	`63.38% <0.00%> (-5.86%)`	⬇️
parquet/src/data_type.rs	`75.74% <84.00%> (+0.98%)`	⬆️
parquet/src/encodings/decoding.rs	`88.70% <85.79%> (-0.84%)`	⬇️
parquet/src/encodings/rle.rs	`92.59% <92.77%> (+0.03%)`	⬆️
parquet/src/util/bit_util.rs	`93.70% <92.95%> (-0.11%)`	⬇️
arrow/src/compute/kernels/take.rs	`95.46% <0.00%> (+0.19%)`	⬆️
arrow/src/array/array_union.rs	`90.89% <0.00%> (+0.74%)`	⬆️

Continue to review full report at Codecov.

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tustvold

Awesome work, only some minor nits

tustvold · 2022-07-16T12:47:21Z

arrow-flight/src/arrow.flight.protocol.rs

-            tonic::Response<tonic::codec::Streaming<super::HandshakeResponse>>,
-            tonic::Status,
-        > {
+                tonic::Response<tonic::codec::Streaming<super::HandshakeResponse>>,


I wonder if you have an out of date lockfile, which is resulting in these changes??

Yeah, that was it. Thanks!

tustvold · 2022-07-16T12:47:46Z

arrow/Cargo.toml

@@ -41,7 +41,7 @@ bench = false
 ahash = { version = "0.7", default-features = false }
 serde = { version = "1.0", default-features = false }
 serde_derive = { version = "1.0", default-features = false }
-serde_json = { version = "1.0", default-features = false, features = ["preserve_order"] }
+serde_json = { version = "1.0", default-features = false, features = ["preserve_order","std"] }


This shouldn't be necessary if you update your lockfile

tustvold · 2022-07-16T12:52:16Z

parquet/src/data_type.rs

+            let bit_reader = decoder.bit_reader.as_mut().unwrap();
+            let num_values = std::cmp::min(num_values, decoder.num_values);
+            let mut buffer = vec![false; num_values];
+            let values_read = bit_reader.get_batch(&mut buffer[..num_values], 1);


BitReader::skip?

tustvold · 2022-07-16T12:53:02Z

parquet/src/data_type.rs

+                #[inline]
+                fn skip(decoder: &mut PlainDecoderDetails, num_values: usize) -> Result<usize> {
+                    let data = decoder.data.as_ref().expect("set_data should have been called");
+                    let num_values = std::cmp::min(num_values, decoder.num_values);


Suggested change

let num_values = std::cmp::min(num_values, decoder.num_values);

let num_values = num_values.min(decoder.num_values);

tustvold · 2022-07-16T12:53:28Z

parquet/src/data_type.rs

+                .data
+                .as_mut()
+                .expect("set_data should have been called");
+            let num_values = std::cmp::min(num_values, decoder.num_values);


Suggested change

let num_values = std::cmp::min(num_values, decoder.num_values);

let num_values = num_values.min(decoder.num_values);

tustvold · 2022-07-16T13:17:30Z

parquet/src/encodings/rle.rs

+            "eee", "fff", "ddd", "eee", "fff", "eee", "fff",
+            "fff",
+        ];
+        let skipped = decoder.skip(4).expect("skipping two values");


Suggested change

let skipped = decoder.skip(4).expect("skipping two values");

let skipped = decoder.skip(4).expect("skipping four values");

tustvold · 2022-07-16T13:19:28Z

parquet/src/util/bit_util.rs

+
+        let mut values_skipped = 0;
+
+        if num_bits > 32 {


We don't need this special case for skip, this exists in get_batch because we only have unpack32 and not unpack64

Ted-Jiang · 2022-07-16T14:47:42Z

parquet/src/encodings/decoding.rs

@@ -355,6 +362,8 @@ impl<T: DataType> Decoder<T> for DictDecoder<T> {
        rle.get_batch_with_dict(&self.dictionary[..], buffer, num_values)
    }

+


nit: useless space.

Ted-Jiang · 2022-07-16T14:50:12Z

parquet/src/encodings/decoding.rs

@@ -291,6 +294,10 @@ impl<T: DataType> Decoder<T> for PlainDecoder<T> {
    fn get(&mut self, buffer: &mut [T::T]) -> Result<usize> {
        T::T::decode(buffer, &mut self.inner)
    }
+


Should we set #[inline] get better perfomance ?🤔

because i fond encoding set_data all with inline

parquet/src/encodings/decoding.rs

Ted-Jiang · 2022-07-16T15:06:34Z

Nice job! 🥳

Co-authored-by: Yang Jiang <[email protected]>

ursabot · 2022-07-16T21:21:10Z

Benchmark runs are scheduled for baseline = 13adaa7 and contender = c585544. c585544 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
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

github-actions bot added arrow Changes to the arrow crate arrow-flight Changes to the arrow-flight crate parquet Changes to the parquet crate labels Jul 16, 2022

thinkharderdev commented Jul 16, 2022

View reviewed changes

thinkharderdev changed the title ~~Issue 2078~~ Support skip_values in ColumnValueDecoderImpl Jul 16, 2022

tustvold approved these changes Jul 16, 2022

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tustvold mentioned this pull request Jul 16, 2022

Make skip value in ByteArrayDecoderDictionary avoid decoding #2088

Closed

thinkharderdev added 3 commits July 16, 2022 09:30

Add skip method to ParquetValueType

3a3da49

Tests

8ae0f26

PR comments

39a872f

thinkharderdev force-pushed the issue-2078 branch from 154982e to 39a872f Compare July 16, 2022 13:40

Ted-Jiang approved these changes Jul 16, 2022

View reviewed changes

Ted-Jiang reviewed Jul 16, 2022

View reviewed changes

parquet/src/encodings/decoding.rs Outdated Show resolved Hide resolved

tustvold removed arrow Changes to the arrow crate arrow-flight Changes to the arrow-flight crate labels Jul 16, 2022

thinkharderdev and others added 2 commits July 16, 2022 14:49

Update parquet/src/encodings/decoding.rs

a8b910f

Co-authored-by: Yang Jiang <[email protected]>

PR comments

7657f96

tustvold merged commit c585544 into apache:master Jul 16, 2022

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Support skip_values in ColumnValueDecoderImpl #2089

Support skip_values in ColumnValueDecoderImpl #2089

thinkharderdev commented Jul 16, 2022

thinkharderdev Jul 16, 2022

thinkharderdev Jul 16, 2022

thinkharderdev commented Jul 16, 2022

codecov-commenter commented Jul 16, 2022 •

edited

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tustvold Jul 16, 2022

Ted-Jiang Jul 16, 2022

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Ted-Jiang Jul 16, 2022

Ted-Jiang commented Jul 16, 2022

ursabot commented Jul 16, 2022

	let num_values = std::cmp::min(num_values, decoder.num_values);
	let num_values = num_values.min(decoder.num_values);

	let skipped = decoder.skip(4).expect("skipping two values");
	let skipped = decoder.skip(4).expect("skipping four values");

		@@ -355,6 +362,8 @@ impl<T: DataType> Decoder<T> for DictDecoder<T> {
		rle.get_batch_with_dict(&self.dictionary[..], buffer, num_values)
		}

Support skip_values in ColumnValueDecoderImpl #2089

Support skip_values in ColumnValueDecoderImpl #2089

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thinkharderdev commented Jul 16, 2022

Which issue does this PR close?

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Are there any user-facing changes?

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thinkharderdev commented Jul 16, 2022

codecov-commenter commented Jul 16, 2022 • edited Loading

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Ted-Jiang commented Jul 16, 2022

ursabot commented Jul 16, 2022

codecov-commenter commented Jul 16, 2022 •

edited

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