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75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
#include <Functions/extractTimeZoneFromFunctionArguments.h>
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#include <Functions/FunctionHelpers.h>
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#include <Core/Block.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypeDateTime64.h>
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#include <Columns/ColumnString.h>
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#include <common/DateLUT.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 ILLEGAL_COLUMN;
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}
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static std::string extractTimeZoneNameFromColumn(const IColumn & column)
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{
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const ColumnConst * time_zone_column = checkAndGetColumnConst<ColumnString>(&column);
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if (!time_zone_column)
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throw Exception("Illegal column " + column.getName()
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+ " of time zone argument of function, must be constant string",
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ErrorCodes::ILLEGAL_COLUMN);
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return time_zone_column->getValue<String>();
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}
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std::string extractTimeZoneNameFromFunctionArguments(const ColumnsWithTypeAndName & arguments, size_t time_zone_arg_num, size_t datetime_arg_num)
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{
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/// Explicit time zone may be passed in last argument.
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if (arguments.size() == time_zone_arg_num + 1 && arguments[time_zone_arg_num].column)
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{
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return extractTimeZoneNameFromColumn(*arguments[time_zone_arg_num].column);
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}
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else
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{
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if (arguments.empty())
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return {};
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/// If time zone is attached to an argument of type DateTime.
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if (const auto * type = checkAndGetDataType<DataTypeDateTime>(arguments[datetime_arg_num].type.get()))
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return type->getTimeZone().getTimeZone();
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if (const auto * type = checkAndGetDataType<DataTypeDateTime64>(arguments[datetime_arg_num].type.get()))
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return type->getTimeZone().getTimeZone();
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return {};
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}
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}
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const DateLUTImpl & extractTimeZoneFromFunctionArguments(Block & block, const ColumnNumbers & arguments, size_t time_zone_arg_num, size_t datetime_arg_num)
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{
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if (arguments.size() == time_zone_arg_num + 1)
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return DateLUT::instance(extractTimeZoneNameFromColumn(*block.getByPosition(arguments[time_zone_arg_num]).column));
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else
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{
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if (arguments.empty())
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return DateLUT::instance();
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/// If time zone is attached to an argument of type DateTime.
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if (const auto * type = checkAndGetDataType<DataTypeDateTime>(block.getByPosition(arguments[datetime_arg_num]).type.get()))
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return type->getTimeZone();
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if (const auto * type = checkAndGetDataType<DataTypeDateTime64>(block.getByPosition(arguments[datetime_arg_num]).type.get()))
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return type->getTimeZone();
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return DateLUT::instance();
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}
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}
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}
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