Allow explicitly set compression level in output format

docs/en/operations/settings/settings.md

@@ -4771,6 +4771,24 @@ Type: Int64
 
 Default: 0
 
+
+## output_format_compression_level
+
+Default compression level if query output is compressed. The setting is applied when `SELECT` query has `INTO OUTFILE` or when writing to table functions `file`, `url`, `hdfs`, `s3`, or `azureBlobStorage`.
+
+Possible values: from `1` to `22`
+
+Default: `3`
+
+
+## output_format_compression_zstd_window_log
+
+To be used when output compression method is `zstd`. If greater than `0`, this setting explicitly sets compression window size (expressed as power of `2`) and enable long-range mode for zstd compression. This can help to achieve better compression ratio.
+
+Possible values: non-negative numbers. Note that if the value is too small or too big, `zstdlib` will throw exception. Typical values are from `20` (window size = `1MB`) to `30` (window size = `1GB`).
+
+Default: `0`
+
 ## rewrite_count_distinct_if_with_count_distinct_implementation
 
 Allows you to rewrite `countDistcintIf` with [count_distinct_implementation](#count_distinct_implementation) setting.

src/Core/Settings.h

@@ -204,6 +204,8 @@ class IColumn;
     M(Bool, input_format_parallel_parsing, true, "Enable parallel parsing for some data formats.", 0) \
     M(UInt64, min_chunk_bytes_for_parallel_parsing, (10 * 1024 * 1024), "The minimum chunk size in bytes, which each thread will parse in parallel.", 0) \
     M(Bool, output_format_parallel_formatting, true, "Enable parallel formatting for some data formats.", 0) \
+    M(UInt64, output_format_compression_level, 3, "Default compression level if query output is compressed. The setting is applied when `SELECT` query has `INTO OUTFILE` or when inserting to table function `file`, `url`, `hdfs`, `s3`, and `azureBlobStorage`.", 0) \
+    M(UInt64, output_format_compression_zstd_window_log, 0, "To be used when output compression method is `zstd`. If greater than `0`, this setting explicitly sets compression window size (expressed as power of `2`) and enable long-range mode for zstd compression.", 0) \
     \
     M(UInt64, merge_tree_min_rows_for_concurrent_read, (20 * 8192), "If at least as many lines are read from one file, the reading can be parallelized.", 0) \
     M(UInt64, merge_tree_min_bytes_for_concurrent_read, (24 * 10 * 1024 * 1024), "If at least as many bytes are read from one file, the reading can be parallelized.", 0) \

src/IO/CompressionMethod.cpp

@@ -170,7 +170,7 @@ std::unique_ptr<ReadBuffer> wrapReadBufferWithCompressionMethod(
 }
 
 std::unique_ptr<WriteBuffer> wrapWriteBufferWithCompressionMethod(
-    std::unique_ptr<WriteBuffer> nested, CompressionMethod method, int level, size_t buf_size, char * existing_memory, size_t alignment)
+    std::unique_ptr<WriteBuffer> nested, CompressionMethod method, int level, int zstd_window_log, size_t buf_size, char * existing_memory, size_t alignment)
 {
     if (method == DB::CompressionMethod::Gzip || method == CompressionMethod::Zlib)
         return std::make_unique<ZlibDeflatingWriteBuffer>(std::move(nested), method, level, buf_size, existing_memory, alignment);
@@ -183,7 +183,7 @@ std::unique_ptr<WriteBuffer> wrapWriteBufferWithCompressionMethod(
         return std::make_unique<LZMADeflatingWriteBuffer>(std::move(nested), level, buf_size, existing_memory, alignment);
 
     if (method == CompressionMethod::Zstd)
-        return std::make_unique<ZstdDeflatingWriteBuffer>(std::move(nested), level, buf_size, existing_memory, alignment);
+        return std::make_unique<ZstdDeflatingWriteBuffer>(std::move(nested), level, zstd_window_log, buf_size, existing_memory, alignment);
 
     if (method == CompressionMethod::Lz4)
         return std::make_unique<Lz4DeflatingWriteBuffer>(std::move(nested), level, buf_size, existing_memory, alignment);

src/IO/CompressionMethod.h

@@ -66,6 +66,7 @@ std::unique_ptr<WriteBuffer> wrapWriteBufferWithCompressionMethod(
     std::unique_ptr<WriteBuffer> nested,
     CompressionMethod method,
     int level,
+    int zstd_window_log = 0,
     size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
     char * existing_memory = nullptr,
     size_t alignment = 0);

src/IO/ZstdDeflatingWriteBuffer.cpp

@@ -1,30 +1,51 @@
 #include <IO/ZstdDeflatingWriteBuffer.h>
 #include <Common/Exception.h>
+#include <IO/WriteHelpers.h>
 
 namespace DB
 {
 namespace ErrorCodes
 {
     extern const int ZSTD_ENCODER_FAILED;
+    extern const int ILLEGAL_CODEC_PARAMETER;
+}
+
+static void setZstdParameter(ZSTD_CCtx * cctx, ZSTD_cParameter param, int value)
+{
+    auto ret = ZSTD_CCtx_setParameter(cctx, param, value);
+    if (ZSTD_isError(ret))
+        throw Exception(
+            ErrorCodes::ZSTD_ENCODER_FAILED,
+            "zstd stream encoder option setting failed: error code: {}; zstd version: {}",
+            ret,
+            ZSTD_VERSION_STRING);
 }
 
 ZstdDeflatingWriteBuffer::ZstdDeflatingWriteBuffer(
-    std::unique_ptr<WriteBuffer> out_, int compression_level, size_t buf_size, char * existing_memory, size_t alignment)
+    std::unique_ptr<WriteBuffer> out_, int compression_level, int window_log, size_t buf_size, char * existing_memory, size_t alignment)
     : WriteBufferWithOwnMemoryDecorator(std::move(out_), buf_size, existing_memory, alignment)
 {
     cctx = ZSTD_createCCtx();
     if (cctx == nullptr)
         throw Exception(ErrorCodes::ZSTD_ENCODER_FAILED, "zstd stream encoder init failed: zstd version: {}", ZSTD_VERSION_STRING);
-    size_t ret = ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, compression_level);
-    if (ZSTD_isError(ret))
-        throw Exception(ErrorCodes::ZSTD_ENCODER_FAILED,
-                        "zstd stream encoder option setting failed: error code: {}; zstd version: {}",
-                        ret, ZSTD_VERSION_STRING);
-    ret = ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1);
-    if (ZSTD_isError(ret))
-        throw Exception(ErrorCodes::ZSTD_ENCODER_FAILED,
-                        "zstd stream encoder option setting failed: error code: {}; zstd version: {}",
-                        ret, ZSTD_VERSION_STRING);
+    setZstdParameter(cctx, ZSTD_c_compressionLevel, compression_level);
+
+    if (window_log > 0)
+    {
+        ZSTD_bounds window_log_bounds = ZSTD_cParam_getBounds(ZSTD_c_windowLog);
+        if (ZSTD_isError(window_log_bounds.error))
+            throw Exception(ErrorCodes::ILLEGAL_CODEC_PARAMETER, "ZSTD windowLog parameter is not supported {}",
+                std::string(ZSTD_getErrorName(window_log_bounds.error)));
+        if (window_log > window_log_bounds.upperBound || window_log < window_log_bounds.lowerBound)
+            throw Exception(ErrorCodes::ILLEGAL_CODEC_PARAMETER,
+                            "ZSTD codec can't have window log more than {} and lower than {}, given {}",
+                            toString(window_log_bounds.upperBound),
+                            toString(window_log_bounds.lowerBound), toString(window_log));
+        setZstdParameter(cctx, ZSTD_c_enableLongDistanceMatching, 1);
+        setZstdParameter(cctx, ZSTD_c_windowLog, window_log);
+    }
+
+    setZstdParameter(cctx, ZSTD_c_checksumFlag, 1);
 
     input = {nullptr, 0, 0};
     output = {nullptr, 0, 0};

src/IO/ZstdDeflatingWriteBuffer.h

@@ -17,6 +17,7 @@ class ZstdDeflatingWriteBuffer : public WriteBufferWithOwnMemoryDecorator
     ZstdDeflatingWriteBuffer(
         std::unique_ptr<WriteBuffer> out_,
         int compression_level,
+        int window_log = 0,
         size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
         char * existing_memory = nullptr,
         size_t alignment = 0);

src/Interpreters/executeQuery.cpp

@@ -1434,11 +1434,12 @@ void executeQuery(
                     const auto & compression_method_node = ast_query_with_output->compression->as<ASTLiteral &>();
                     compression_method = compression_method_node.value.safeGet<std::string>();
                 }
-
+                const auto & settings = context->getSettingsRef();
                 compressed_buffer = wrapWriteBufferWithCompressionMethod(
                     std::make_unique<WriteBufferFromFile>(out_file, DBMS_DEFAULT_BUFFER_SIZE, O_WRONLY | O_EXCL | O_CREAT),
                     chooseCompressionMethod(out_file, compression_method),
-                    /* compression level = */ 3
+                    /* compression level = */ static_cast<int>(settings.output_format_compression_level),
+                    /* zstd_window_log = */ static_cast<int>(settings.output_format_compression_zstd_window_log)
                 );
             }
 

src/Processors/Formats/Impl/Parquet/Write.cpp

@@ -448,6 +448,7 @@ PODArray<char> & compress(PODArray<char> & source, PODArray<char> & scratch, Com
                 std::move(dest_buf),
                 method,
                 /*level*/ 3,
+                /*zstd_window_log*/ 0,
                 source.size(),
                 /*existing_memory*/ source.data());
             chassert(compressed_buf->position() == source.data());

src/Server/HTTP/WriteBufferFromHTTPServerResponse.cpp

@@ -112,6 +112,7 @@ void WriteBufferFromHTTPServerResponse::nextImpl()
                     std::make_unique<WriteBufferFromOStream>(*response_body_ostr),
                     compress ? compression_method : CompressionMethod::None,
                     compression_level,
+                    0,
                     working_buffer.size(),
                     working_buffer.begin());
             else

src/Storages/HDFS/StorageHDFS.cpp

@@ -723,13 +723,13 @@ class HDFSSink : public SinkToStorage
         const CompressionMethod compression_method)
         : SinkToStorage(sample_block)
     {
+        const auto & settings = context->getSettingsRef();
         write_buf = wrapWriteBufferWithCompressionMethod(
             std::make_unique<WriteBufferFromHDFS>(
-                uri,
-                context->getGlobalContext()->getConfigRef(),
-                context->getSettingsRef().hdfs_replication,
-                context->getWriteSettings()),
-            compression_method, 3);
+                uri, context->getGlobalContext()->getConfigRef(), context->getSettingsRef().hdfs_replication, context->getWriteSettings()),
+            compression_method,
+            static_cast<int>(settings.output_format_compression_level),
+            static_cast<int>(settings.output_format_compression_zstd_window_log));
         writer = FormatFactory::instance().getOutputFormatParallelIfPossible(format, *write_buf, sample_block, context);
     }
 

src/Storages/StorageAzureBlob.cpp

@@ -533,7 +533,12 @@ class StorageAzureBlobSink : public SinkToStorage
         , format_settings(format_settings_)
     {
         StoredObject object(blob_path);
-        write_buf = wrapWriteBufferWithCompressionMethod(object_storage->writeObject(object, WriteMode::Rewrite), compression_method, 3);
+        const auto & settings = context->getSettingsRef();
+        write_buf = wrapWriteBufferWithCompressionMethod(
+            object_storage->writeObject(object, WriteMode::Rewrite),
+            compression_method,
+            static_cast<int>(settings.output_format_compression_level),
+            static_cast<int>(settings.output_format_compression_zstd_window_log));
         writer = FormatFactory::instance().getOutputFormatParallelIfPossible(format, *write_buf, sample_block, context, format_settings);
     }
 

src/Storages/StorageFile.cpp

@@ -1485,8 +1485,12 @@ class StorageFileSink final : public SinkToStorage
 
         /// In case of formats with prefixes if file is not empty we have already written prefix.
         bool do_not_write_prefix = naked_buffer->size();
-
-        write_buf = wrapWriteBufferWithCompressionMethod(std::move(naked_buffer), compression_method, 3);
+        const auto & settings = context->getSettingsRef();
+        write_buf = wrapWriteBufferWithCompressionMethod(
+            std::move(naked_buffer),
+            compression_method,
+            static_cast<int>(settings.output_format_compression_level),
+            static_cast<int>(settings.output_format_compression_zstd_window_log));
 
         writer = FormatFactory::instance().getOutputFormatParallelIfPossible(format_name,
                                                                              *write_buf, metadata_snapshot->getSampleBlock(), context, format_settings);

src/Storages/StorageS3.cpp

@@ -932,6 +932,7 @@ class StorageS3Sink : public SinkToStorage
             blob_log->query_id = context->getCurrentQueryId();
         }
 
+        const auto & settings = context->getSettingsRef();
         write_buf = wrapWriteBufferWithCompressionMethod(
             std::make_unique<WriteBufferFromS3>(
                 configuration_.client,
@@ -944,7 +945,8 @@ class StorageS3Sink : public SinkToStorage
                 threadPoolCallbackRunner<void>(getIOThreadPool().get(), "S3ParallelWrite"),
                 context->getWriteSettings()),
             compression_method,
-            3);
+            static_cast<int>(settings.output_format_compression_level),
+            static_cast<int>(settings.output_format_compression_zstd_window_log));
         writer
             = FormatFactory::instance().getOutputFormatParallelIfPossible(format, *write_buf, sample_block, context, format_settings);
     }

src/Storages/StorageURL.cpp

@@ -540,11 +540,12 @@ StorageURLSink::StorageURLSink(
         Poco::URI(uri), http_method, content_type, content_encoding, headers, timeouts, DBMS_DEFAULT_BUFFER_SIZE, proxy_config
     );
 
+    const auto & settings = context->getSettingsRef();
     write_buf = wrapWriteBufferWithCompressionMethod(
         std::move(write_buffer),
         compression_method,
-        3
-    );
+        static_cast<int>(settings.output_format_compression_level),
+        static_cast<int>(settings.output_format_compression_zstd_window_log));
     writer = FormatFactory::instance().getOutputFormat(format, *write_buf, sample_block, context, format_settings);
 }
 

tests/queries/0_stateless/02961_output_format_compress_params.reference

@@ -0,0 +1 @@
+1000000

tests/queries/0_stateless/02961_output_format_compress_params.sql

@@ -0,0 +1,4 @@
+INSERT INTO FUNCTION file('test_02961.csv', 'CSV', 'x UInt64', 'zstd') SELECT number FROM numbers(1000000) SETTINGS output_format_compression_level = 10, output_format_compression_zstd_window_log = 30, engine_file_truncate_on_insert = 1;
+-- Simple check that output_format_compression_zstd_window_log = 30 works
+SELECT count() FROM file('test_02961.csv', 'CSV', 'x UInt64', 'zstd');  -- { serverError ZSTD_DECODER_FAILED }
+SELECT count() FROM file('test_02961.csv', 'CSV', 'x UInt64', 'zstd') SETTINGS zstd_window_log_max = 30;