Add support for ZSTD compression

.github/workflows/test-extensions.yml

@@ -0,0 +1,91 @@
+name: Extensions Tests
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/**'
+      - 'src/adapter/**'
+      - 'src/core/**'
+      - 'src/lib/**'
+      - 'tools/**'
+      - 'examples/**'
+      - 'composer.lock'
+  push:
+    branches: [ 1.x ]
+    paths-ignore:
+      - 'CHANGELOG.md'
+
+# See https://stackoverflow.com/a/72408109
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    name: "Tests"
+
+    runs-on: ${{ matrix.operating-system }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        dependencies:
+          - "locked"
+          - "lowest"
+          - "highest"
+        php-version:
+          - "8.1"
+          - "8.2"
+          - "8.3"
+        operating-system:
+          - "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v4"
+
+      - name: "Install dependencies"
+        run: |
+          sudo apt-get update && sudo apt-get install libzstd1 --assume-yes
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          tools: composer:v2
+          php-version: "${{ matrix.php-version }}"
+          ini-values: memory_limit=-1
+          extensions: :psr, zstd
+
+      - name: "List PHP Extensions"
+        run: php -m
+
+      - name: "List PHP configuration"
+        run: php -i
+
+      - name: "Get Composer Cache Directory"
+        id: composer-cache
+        run: |
+          echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: "Cache Composer dependencies"
+        uses: "actions/cache@v3"
+        with:
+          path: "${{ steps.composer-cache.outputs.dir }}"
+          key: "php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-${{ hashFiles('**/composer.lock') }}"
+          restore-keys: |
+            php-${{ matrix.php-version }}-${{ matrix.dependencies }}-composer-
+
+      - name: "Install lowest dependencies"
+        if: ${{ matrix.dependencies == 'lowest' }}
+        run: "composer update --prefer-lowest --no-interaction --no-progress --no-suggest"
+
+      - name: "Install highest dependencies"
+        if: ${{ matrix.dependencies == 'highest' }}
+        run: "composer update --no-interaction --no-progress --no-suggest"
+
+      - name: "Install locked dependencies"
+        if: ${{ matrix.dependencies == 'locked' }}
+        run: "composer install --no-interaction --no-progress --no-suggest"
+
+      - name: "Test ZSTD"
+        run: "composer test -- --group zstd-extension"

composer.json

@@ -69,6 +69,7 @@
             "src/core/etl/src/Flow/ETL/DSL/functions.php",
             "src/lib/array-dot/src/Flow/ArrayDot/array_dot.php",
             "src/lib/parquet/src/Flow/Parquet/functions.php",
+            "src/lib/parquet/src/stubs.php",
             "src/lib/snappy/polyfill.php"
         ],
         "psr-4": {

src/lib/parquet/composer.json

@@ -31,7 +31,8 @@
             ]
         },
         "files": [
-            "src/Flow/Parquet/functions.php"
+            "src/Flow/Parquet/functions.php",
+            "src/stubs.php"
         ]
     },
     "autoload-dev": {

src/lib/parquet/src/Flow/Parquet/Option.php

@@ -107,4 +107,12 @@ enum Option
      * Default 1
      */
     case WRITER_VERSION;
+
+    /**
+     * Compression level for ZSTD codec. This option is going to be passed to zstd_compress function when Compression is set to ZSTD.
+     * A value smaller than 0 means a faster compression level. (Zstandard library 1.3.4 or later).
+     *
+     * Default value is 3
+     */
+    case ZSTD_COMPRESSION_LEVEL;
 }

src/lib/parquet/src/Flow/Parquet/Options.php

@@ -25,6 +25,7 @@ public function __construct()
             Option::DICTIONARY_PAGE_SIZE->name => Consts::MB_SIZE,
             Option::DICTIONARY_PAGE_MIN_CARDINALITY_RATION->name => 0.4,
             Option::GZIP_COMPRESSION_LEVEL->name => 9,
+            Option::ZSTD_COMPRESSION_LEVEL->name => 3,
             Option::WRITER_VERSION->name => 1,
             Option::VALIDATE_DATA->name => true,
         ];

src/lib/parquet/src/Flow/Parquet/ParquetFile/Codec.php

@@ -26,6 +26,7 @@ public function compress(string $data, Compressions $compression) : string
             Compressions::SNAPPY => \snappy_compress($data),
             /** @phpstan-ignore-next-line */
             Compressions::GZIP => \gzencode($data, $this->options->get(Option::GZIP_COMPRESSION_LEVEL)),
+            Compressions::ZSTD => \zstd_compress($data, $this->options->getInt(Option::ZSTD_COMPRESSION_LEVEL)),
             default => throw new RuntimeException('Compression ' . $compression->name . ' is not supported yet')
         };
 
@@ -43,6 +44,7 @@ public function decompress(string $data, Compressions $compression) : string
             Compressions::UNCOMPRESSED => $data,
             Compressions::SNAPPY => \snappy_uncompress($data),
             Compressions::GZIP => \gzdecode($data),
+            Compressions::ZSTD => \zstd_uncompress($data),
             default => throw new RuntimeException('Compression ' . $compression->name . ' is not supported yet')
         };
 

src/lib/parquet/src/Flow/Parquet/Writer.php

@@ -35,6 +35,7 @@ public function __construct(
             case Compressions::UNCOMPRESSED:
             case Compressions::SNAPPY:
             case Compressions::GZIP:
+            case Compressions::ZSTD:
                 break;
 
             default:

src/lib/parquet/src/stubs.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+if (!\function_exists('zstd_compress')) {
+    function zstd_compress(string $data, int $level = 3) : string
+    {
+        throw new RuntimeException('The Zstd extension is not available');
+    }
+}
+
+if (!\function_exists('zstd_uncompress')) {
+    function zstd_uncompress(string $data) : string
+    {
+        throw new RuntimeException('The Zstd extension is not available');
+    }
+}

src/lib/parquet/tests/Flow/Parquet/Tests/Integration/IO/CompressionTest.php

@@ -8,6 +8,7 @@
 use Flow\Parquet\ParquetFile\Schema\{FlatColumn, ListElement, NestedColumn};
 use Flow\Parquet\ParquetFile\{Compressions, Schema};
 use Flow\Parquet\{Consts, Reader, Writer};
+use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
 
 final class CompressionTest extends TestCase
@@ -152,4 +153,56 @@ public function test_writing_and_reading_file_with_uncompressed_compression() :
         self::assertFileExists($path);
         \unlink($path);
     }
+
+    #[Group('zstd-extension')]
+    public function test_writing_and_reading_file_with_zstd_compression() : void
+    {
+        if (!\extension_loaded('zstd')) {
+            self::markTestSkipped('The Zstd extension is not available');
+        }
+
+        $path = \sys_get_temp_dir() . '/test-writer-parquet-test-' . bin2hex(random_bytes(16)) . '.parquet';
+
+        $writer = new Writer(Compressions::ZSTD);
+
+        $schema = Schema::with(NestedColumn::struct('struct', [
+            FlatColumn::int64('int64'),
+            FlatColumn::boolean('boolean'),
+            FlatColumn::string('string'),
+            FlatColumn::int32('int32'),
+            NestedColumn::list('list_of_int', ListElement::int32()),
+            NestedColumn::list('list_of_string', ListElement::string()),
+        ]));
+
+        $faker = Factory::create();
+        $inputData = \array_merge(...\array_map(static function (int $i) use ($faker) : array {
+            return [
+                [
+                    'struct' => [
+                        'int64' => $faker->numberBetween(0, Consts::PHP_INT64_MAX),
+                        'boolean' => $faker->boolean,
+                        'string' => $faker->text(150),
+                        'int32' => $faker->numberBetween(0, Consts::PHP_INT32_MAX),
+                        'list_of_int' => \array_map(
+                            static fn ($i) => $faker->numberBetween(0, Consts::PHP_INT32_MAX),
+                            \range(1, \random_int(2, 10))
+                        ),
+                        'list_of_string' => \array_map(
+                            static fn ($i) => $faker->text(10),
+                            \range(1, \random_int(2, 10))
+                        ),
+                    ],
+                ],
+            ];
+        }, \range(1, 100)));
+
+        $writer->write($path, $schema, $inputData);
+
+        self::assertSame(
+            $inputData,
+            \iterator_to_array((new Reader())->read($path)->values())
+        );
+        self::assertFileExists($path);
+        \unlink($path);
+    }
 }

src/lib/parquet/tests/Flow/Parquet/Tests/Unit/ParquetFile/CodecTest.php

@@ -6,6 +6,7 @@
 
 use Flow\Parquet\ParquetFile\{Codec, Compressions};
 use Flow\Parquet\{Option, Options};
+use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
 
 final class CodecTest extends TestCase
@@ -45,4 +46,21 @@ public function test_uncompressed() : void
             $codec->decompress($codec->compress($data, Compressions::UNCOMPRESSED), Compressions::UNCOMPRESSED)
         );
     }
+
+    #[Group('zstd-extension')]
+    public function test_zstd() : void
+    {
+        if (!\extension_loaded('zstd')) {
+            self::markTestSkipped('The Zstd extension is not available');
+        }
+
+        $data = 'this is some test data to be compressed';
+
+        $codec = new Codec((new Options()));
+
+        self::assertSame(
+            $data,
+            $codec->decompress($codec->compress($data, Compressions::ZSTD), Compressions::ZSTD)
+        );
+    }
 }