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Implemented javaHashUTF16LE()

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This commit is contained in:
philip.han 2019-11-06 19:46:37 +09:00
parent 6a871f579f
commit 68a82f78b4
4 changed files with 45 additions and 0 deletions
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1
dbms/src/Functions/FunctionsHashing.cpp
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@ -23,6 +23,7 @@ void registerFunctionsHashing(FunctionFactory & factory)
factory.registerFunction<FunctionIntHash64>();
factory.registerFunction<FunctionURLHash>();
factory.registerFunction<FunctionJavaHash>();
factory.registerFunction<FunctionJavaHashUTF16LE>();
factory.registerFunction<FunctionHiveHash>();
factory.registerFunction<FunctionMurmurHash2_32>();
factory.registerFunction<FunctionMurmurHash2_64>();

38
dbms/src/Functions/FunctionsHashing.h
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@ -353,6 +353,43 @@ struct JavaHashImpl
static constexpr bool use_int_hash_for_pods = false;
};
struct JavaHashUTF16LEImpl
{
static constexpr auto name = "javaHashUTF16LE";
using ReturnType = Int32;
static Int32 apply(const char * raw_data, const size_t raw_size)
{
char * data = const_cast<char *>(raw_data);
size_t size = raw_size;
// Remove Byte-order-mark(0xFFFE) for UTF-16LE
if (size >= 2 && data[0] == -1 && data[1] == -2)
{
data += 2;
size -= 2;
}
if (size % 2 != 0)
throw Exception("Arguments for javaHashUTF16LE must be in the form of UTF-16", ErrorCodes::LOGICAL_ERROR);
UInt32 h = 0;
for (size_t i = 0; i < size; i += 2)
h = 31 * h + static_cast<UInt32>((data[i] & 0xFF) << HI_BYTE_SHIFT | (data[i+1] & 0xFF) << LO_BYTE_SHIFT);
return static_cast<Int32>(h);
}
static Int32 combineHashes(Int32, Int32)
{
throw Exception("Java hash is not combineable for multiple arguments", ErrorCodes::NOT_IMPLEMENTED);
}
static constexpr bool use_int_hash_for_pods = false;
static constexpr int HI_BYTE_SHIFT = 0;
static constexpr int LO_BYTE_SHIFT = 8;
};
/// This is just JavaHash with zeroed out sign bit.
/// This function is used in Hive for versions before 3.0,
/// after 3.0, Hive uses murmur-hash3.
@ -1102,6 +1139,7 @@ using FunctionMurmurHash3_32 = FunctionAnyHash<MurmurHash3Impl32>;
using FunctionMurmurHash3_64 = FunctionAnyHash<MurmurHash3Impl64>;
using FunctionMurmurHash3_128 = FunctionStringHashFixedString<MurmurHash3Impl128>;
using FunctionJavaHash = FunctionAnyHash<JavaHashImpl>;
using FunctionJavaHashUTF16LE = FunctionAnyHash<JavaHashUTF16LEImpl>;
using FunctionHiveHash = FunctionAnyHash<HiveHashImpl>;
#if USE_XXHASH

3
dbms/tests/queries/0_stateless/00800_function_java_hash.reference
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@ -1,4 +1,7 @@
96354
-676697544
138768
-2143570108
2145564783
96354
1470786104

3
dbms/tests/queries/0_stateless/00800_function_java_hash.sql
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@ -1,4 +1,7 @@
select javaHash('abc');
select javaHash('874293087');
select javaHashUTF16LE(convertCharset('a1가', 'utf-8', 'utf-16le'));
select javaHashUTF16LE(convertCharset('가나다라마바사아자차카타파하', 'utf-8', 'utf-16le'));
select javaHashUTF16LE(convertCharset('FJKLDSJFIOLD_389159837589429', 'utf-8', 'utf-16le'));
select hiveHash('abc');
select hiveHash('874293087');