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https://github.com/ClickHouse/ClickHouse.git
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234 lines
9.2 KiB
C++
234 lines
9.2 KiB
C++
#pragma once
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#include <Functions/extractTimeZoneFromFunctionArguments.h>
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#include <Functions/IFunction.h>
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#include <Functions/FunctionHelpers.h>
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#include <DataTypes/DataTypeDateTime64.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Columns/ColumnConst.h>
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#include <Columns/ColumnsDateTime.h>
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#include <Columns/ColumnsNumber.h>
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#include <Interpreters/Context.h>
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#include <base/arithmeticOverflow.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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/** According to Twitter's post on Snowflake, we can extract the timestamp for a snowflake ID by right shifting
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* the snowflake ID by 22 bits(10 bits machine ID and 12 bits sequence ID) and adding the Twitter epoch time of 1288834974657.
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* https://en.wikipedia.org/wiki/Snowflake_ID
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* https://blog.twitter.com/engineering/en_us/a/2010/announcing-snowflake
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* https://ws-dl.blogspot.com/2019/08/2019-08-03-tweetedat-finding-tweet.html
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*/
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static constexpr size_t snowflake_epoch = 1288834974657L;
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static constexpr int time_shift = 22;
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class FunctionDateTimeToSnowflake : public IFunction
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{
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private:
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const char * name;
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public:
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explicit FunctionDateTimeToSnowflake(const char * name_) : name(name_) { }
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 1; }
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bool isVariadic() const override { return false; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (!isDateTime(arguments[0].type))
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The only argument for function {} must be DateTime", name);
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return std::make_shared<DataTypeInt64>();
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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const auto & src = arguments[0];
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const auto & src_column = *src.column;
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auto res_column = ColumnInt64::create(input_rows_count);
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auto & res_data = res_column->getData();
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const auto & src_data = typeid_cast<const ColumnUInt32 &>(src_column).getData();
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for (size_t i = 0; i < input_rows_count; ++i)
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res_data[i] = (Int64(src_data[i]) * 1000 - snowflake_epoch) << time_shift;
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return res_column;
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}
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};
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class FunctionSnowflakeToDateTime : public IFunction
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{
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private:
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const char * name;
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const bool allow_nonconst_timezone_arguments;
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public:
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explicit FunctionSnowflakeToDateTime(const char * name_, ContextPtr context)
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: name(name_)
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, allow_nonconst_timezone_arguments(context->getSettings().allow_nonconst_timezone_arguments)
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{}
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 0; }
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bool isVariadic() const override { return true; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (arguments.empty() || arguments.size() > 2)
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throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} takes one or two arguments", name);
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if (!typeid_cast<const DataTypeInt64 *>(arguments[0].type.get()))
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The first argument for function {} must be Int64", name);
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std::string timezone;
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if (arguments.size() == 2)
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timezone = extractTimeZoneNameFromFunctionArguments(arguments, 1, 0, allow_nonconst_timezone_arguments);
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return std::make_shared<DataTypeDateTime>(timezone);
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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const auto & src = arguments[0];
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const auto & src_column = *src.column;
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auto res_column = ColumnUInt32::create(input_rows_count);
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auto & res_data = res_column->getData();
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if (const auto * src_column_non_const = typeid_cast<const ColumnInt64 *>(&src_column))
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{
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const auto & src_data = src_column_non_const->getData();
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for (size_t i = 0; i < input_rows_count; ++i)
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res_data[i] = static_cast<UInt32>(
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((src_data[i] >> time_shift) + snowflake_epoch) / 1000);
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}
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else if (const auto * src_column_const = typeid_cast<const ColumnConst *>(&src_column))
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{
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Int64 src_val = src_column_const->getValue<Int64>();
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for (size_t i = 0; i < input_rows_count; ++i)
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res_data[i] = static_cast<UInt32>(
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((src_val >> time_shift) + snowflake_epoch) / 1000);
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}
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else
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal argument for function {}", name);
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return res_column;
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}
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};
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class FunctionDateTime64ToSnowflake : public IFunction
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{
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private:
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const char * name;
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public:
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explicit FunctionDateTime64ToSnowflake(const char * name_) : name(name_) { }
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 1; }
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bool isVariadic() const override { return false; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (!isDateTime64(arguments[0].type))
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The only argument for function {} must be DateTime64", name);
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return std::make_shared<DataTypeInt64>();
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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const auto & src = arguments[0];
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const auto & src_column = *src.column;
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auto res_column = ColumnInt64::create(input_rows_count);
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auto & res_data = res_column->getData();
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const auto & src_data = typeid_cast<const ColumnDecimal<DateTime64> &>(src_column).getData();
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for (size_t i = 0; i < input_rows_count; ++i)
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res_data[i] = (src_data[i] - snowflake_epoch) << time_shift;
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return res_column;
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}
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};
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class FunctionSnowflakeToDateTime64 : public IFunction
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{
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private:
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const char * name;
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const bool allow_nonconst_timezone_arguments;
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public:
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explicit FunctionSnowflakeToDateTime64(const char * name_, ContextPtr context)
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: name(name_)
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, allow_nonconst_timezone_arguments(context->getSettings().allow_nonconst_timezone_arguments)
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{}
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 0; }
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bool isVariadic() const override { return true; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (arguments.empty() || arguments.size() > 2)
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throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Function {} takes one or two arguments", name);
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if (!typeid_cast<const DataTypeInt64 *>(arguments[0].type.get()))
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "The first argument for function {} must be Int64", name);
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std::string timezone;
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if (arguments.size() == 2)
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timezone = extractTimeZoneNameFromFunctionArguments(arguments, 1, 0, allow_nonconst_timezone_arguments);
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return std::make_shared<DataTypeDateTime64>(3, timezone);
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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const auto & src = arguments[0];
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const auto & src_column = *src.column;
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auto res_column = ColumnDecimal<DateTime64>::create(input_rows_count, 3);
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auto & res_data = res_column->getData();
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if (const auto * src_column_non_const = typeid_cast<const ColumnInt64 *>(&src_column))
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{
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const auto & src_data = src_column_non_const->getData();
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for (size_t i = 0; i < input_rows_count; ++i)
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res_data[i] = (src_data[i] >> time_shift) + snowflake_epoch;
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}
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else if (const auto * src_column_const = typeid_cast<const ColumnConst *>(&src_column))
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{
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Int64 src_val = src_column_const->getValue<Int64>();
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for (size_t i = 0; i < input_rows_count; ++i)
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res_data[i] = (src_val >> time_shift) + snowflake_epoch;
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}
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else
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal argument for function {}", name);
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return res_column;
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}
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};
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}
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