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impl

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This commit is contained in:
Nikita Taranov 2024-04-22 19:16:43 +01:00
parent 22e164c65d
commit 252a82dc38
3 changed files with 23 additions and 2 deletions
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8
src/Compression/CompressionCodecGCD.cpp
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@ -24,6 +24,7 @@ public:
void updateHash(SipHash & hash) const override;
protected:
/// 1 byte (`gcd_bytes_size` value) + 1 byte (`bytes_to_skip` value) + `bytes_to_skip` bytes (trash) + `gcd_bytes_size` bytes (gcd value) + (`source_size` - `bytes_to_skip`) bytes (data)
UInt32 doCompressData(const char * source, UInt32 source_size, char * dest) const override;
void doDecompressData(const char * source, UInt32 source_size, char * dest, UInt32 uncompressed_size) const override;
UInt32 getMaxCompressedDataSize(UInt32 uncompressed_size) const override;
@ -54,7 +55,7 @@ UInt32 CompressionCodecGCD::getMaxCompressedDataSize(UInt32 uncompressed_size) c
{
return uncompressed_size
+ gcd_bytes_size // To store gcd
+ 2; // Local header
+ 2; // Values of `gcd_bytes_size` and `bytes_to_skip`
}
uint8_t CompressionCodecGCD::getMethodByte() const
@ -147,7 +148,7 @@ void decompressDataForType(const char * source, UInt32 source_size, char * dest,
if (source_size - sizeof(T) != output_size)
throw Exception(ErrorCodes::CANNOT_DECOMPRESS, "Cannot decompress GCD-encoded data");
memcpy(dest, source, source_size);
memcpy(dest, source, source_size - sizeof(T));
return;
}
@ -160,6 +161,7 @@ void decompressDataForType(const char * source, UInt32 source_size, char * dest,
source += sizeof(T);
dest += sizeof(T);
}
chassert(source == source_end);
}
}
@ -209,6 +211,8 @@ void CompressionCodecGCD::doDecompressData(const char * source, UInt32 source_si
throw Exception(ErrorCodes::CANNOT_DECOMPRESS, "Cannot decompress GCD-encoded data. File has wrong header");
UInt8 bytes_to_skip = uncompressed_size % bytes_size;
chassert(bytes_to_skip == source[1]);
UInt32 output_size = uncompressed_size - bytes_to_skip;
if (static_cast<UInt32>(2 + bytes_to_skip) > source_size)

0
tests/queries/0_stateless/03093_bug_gcd_codec.reference Normal file
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17
tests/queries/0_stateless/03093_bug_gcd_codec.sql Normal file
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@ -0,0 +1,17 @@
-- Tags: long
CREATE TABLE test_gcd(test_col UInt32 CODEC(GCD, LZ4))
ENGINE = MergeTree
ORDER BY tuple()
SETTINGS index_granularity = 8192, index_granularity_bytes = 1024;
INSERT INTO test_gcd SELECT floor(randUniform(1, 3)) FROM numbers(15000000);
OPTIMIZE TABLE test_gcd FINAL;
CREATE TABLE test_gcd2(test_col UInt32 CODEC(GCD, LZ4))
ENGINE = MergeTree
ORDER BY tuple()
SETTINGS index_granularity = 8192, index_granularity_bytes = 1024, min_bytes_for_wide_part = 0, max_compress_block_size = 1024, min_compress_block_size = 1024;
INSERT INTO test_gcd2 SELECT floor(randUniform(1, 3)) FROM numbers(15000000);
OPTIMIZE TABLE test_gcd2 FINAL;