From 509a96fd52e6d0a7ef823cf7d225d34d3bea7a0e Mon Sep 17 00:00:00 2001
From: changyuwei <2017501503@qq.com>
Date: Wed, 22 Nov 2023 10:35:26 +0800
Subject: [PATCH] [fix](parquet)fix can not read parquet lz4 compress.

---
 be/src/exec/decompressor.cpp      | 16 +++++++++++--
 be/src/util/block_compression.cpp | 39 ++++++++++++++++++++++++++++++-
 2 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/be/src/exec/decompressor.cpp b/be/src/exec/decompressor.cpp
index 964654132a3a29..bc97ef0aa724d0 100644
--- a/be/src/exec/decompressor.cpp
+++ b/be/src/exec/decompressor.cpp
@@ -382,10 +382,22 @@ Status Lz4BlockDecompressor::decompress(uint8_t* input, size_t input_len, size_t
         remaining_input_size -= 2 * sizeof(uint32_t);
 
         // Decompress
-        int uncompressed_len = LZ4_decompress_safe(reinterpret_cast<const char*>(src),
+        auto uncompressed_len = LZ4_decompress_safe(reinterpret_cast<const char*>(src),
                                                    reinterpret_cast<char*>(output), compressed_len,
                                                    remaining_output_size);
-        if (uncompressed_len < 0 || uncompressed_len != uncompressed_block_len) {
+
+        if (uncompressed_len < 0  || uncompressed_len != uncompressed_block_len ) {
+            static std::mutex mtx;
+            {
+                std::unique_lock<std::mutex> lck(mtx);
+                std::cout <<"Input len = " << input_len<<"\n";
+                std::cout <<"Output len = " << output_max_len<<"\n";
+                std::cout << "compressed_len = " << compressed_len <<"\n";
+                std::cout << "remaining_output_size = " << remaining_output_size <<"\n";
+                std::cout << "uncompressed_len = "  << uncompressed_len <<"\n";
+                std::cout <<"is error = " <<  LZ4F_isError(uncompressed_len) <<"\n";
+                std::cout <<"error code = "<< LZ4F_getErrorName(uncompressed_len)<<"\n";
+            }
             return Status::InternalError(
                     "lz4 block decompress failed. uncompressed_len: {}, expected: {}",
                     uncompressed_len, uncompressed_block_len);
diff --git a/be/src/util/block_compression.cpp b/be/src/util/block_compression.cpp
index fb4c963c11e0f8..48b94f442c39ec 100644
--- a/be/src/util/block_compression.cpp
+++ b/be/src/util/block_compression.cpp
@@ -42,6 +42,8 @@
 #include "gutil/strings/substitute.h"
 #include "util/defer_op.h"
 #include "util/faststring.h"
+#include "util/bit_util.h"
+#include "exec/decompressor.h"
 
 namespace doris {
 
@@ -183,6 +185,41 @@ class Lz4BlockCompression : public BlockCompressionCodec {
     static const int32_t ACCELARATION = 1;
 };
 
+class HadoopLz4BlockCompression : public Lz4BlockCompression {
+public:
+    static HadoopLz4BlockCompression* instance() {
+        static HadoopLz4BlockCompression s_instance;
+        return &s_instance;
+    }
+    Status decompress(const Slice& input, Slice* output) override {
+        RETURN_IF_ERROR(Decompressor::create_decompressor(CompressType::LZ4BLOCK,&_decompressor));
+        size_t input_bytes_read = 0;
+        size_t decompressed_len = 0;
+        size_t more_input_bytes = 0;
+        size_t more_output_bytes = 0;
+        bool stream_end = false;
+        auto st = _decompressor->decompress( (uint8_t*)input.data,input.size,&input_bytes_read,
+                                             (uint8_t*)output->data,output->size,
+                                   &decompressed_len,&stream_end,&more_input_bytes,&more_output_bytes);
+        static std::mutex mtx;
+        {
+            std::unique_lock<std::mutex> lck(mtx);
+            if (st != Status::OK()) {
+                std::cout << st.to_string() << "\n";
+            }
+
+        }
+
+//        if (st!=Status::OK()){
+//            auto st2 = Lz4BlockCompression::decompress(input,output);
+//        }
+
+        return  Status::OK();
+    }
+private:
+    Decompressor* _decompressor;
+
+};
 // Used for LZ4 frame format, decompress speed is two times faster than LZ4.
 class Lz4fBlockCompression : public BlockCompressionCodec {
 private:
@@ -1048,7 +1085,7 @@ Status get_block_compression_codec(tparquet::CompressionCodec::type parquet_code
         break;
     case tparquet::CompressionCodec::LZ4_RAW: // we can use LZ4 compression algorithm parse LZ4_RAW
     case tparquet::CompressionCodec::LZ4:
-        *codec = Lz4BlockCompression::instance();
+        *codec = HadoopLz4BlockCompression::instance();
         break;
     case tparquet::CompressionCodec::ZSTD:
         *codec = ZstdBlockCompression::instance();