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#include <Columns/ColumnConst.h>
#include <Columns/ColumnsNumber.h>
#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeInterval.h>
#include <Functions/DateTimeTransforms.h>
#include <Functions/FunctionFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int BAD_ARGUMENTS;
}
namespace
{
class FunctionDateTrunc : public IFunction
{
public:
static constexpr auto name = "dateTrunc";
explicit FunctionDateTrunc(ContextPtr context_) : context(context_) {}
static FunctionPtr create(ContextPtr context) { return std::make_shared<FunctionDateTrunc>(context); }
String getName() const override { return name; }
bool isVariadic() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
size_t getNumberOfArguments() const override { return 0; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
/// The first argument is a constant string with the name of datepart.
auto result_type_is_date = false;
String datepart_param;
auto check_first_argument = [&] {
const ColumnConst * datepart_column = checkAndGetColumnConst<ColumnString>(arguments[0].column.get());
if (!datepart_column)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "First argument for function {} must be constant string: "
"name of datepart", getName());
datepart_param = datepart_column->getValue<String>();
if (datepart_param.empty())
throw Exception(ErrorCodes::BAD_ARGUMENTS, "First argument (name of datepart) for function {} cannot be empty",
getName());
if (!IntervalKind::tryParseString(datepart_param, datepart_kind))
throw Exception(ErrorCodes::BAD_ARGUMENTS, "{} doesn't look like datepart name in {}", datepart_param, getName());
result_type_is_date = (datepart_kind == IntervalKind::Year)
|| (datepart_kind == IntervalKind::Quarter) || (datepart_kind == IntervalKind::Month)
|| (datepart_kind == IntervalKind::Week);
};
bool second_argument_is_date = false;
auto check_second_argument = [&] {
if (!isDate(arguments[1].type) && !isDateTime(arguments[1].type) && !isDateTime64(arguments[1].type))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of 2nd argument of function {}. "
"Should be a date or a date with time", arguments[1].type->getName(), getName());
second_argument_is_date = isDate(arguments[1].type);
if (second_argument_is_date && ((datepart_kind == IntervalKind::Hour)
|| (datepart_kind == IntervalKind::Minute) || (datepart_kind == IntervalKind::Second)))
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type Date of argument for function {}", getName());
};
auto check_timezone_argument = [&] {
if (!WhichDataType(arguments[2].type).isString())
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Illegal type {} of argument of function {}. "
"This argument is optional and must be a constant string with timezone name",
arguments[2].type->getName(), getName());
if (second_argument_is_date && result_type_is_date)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"The timezone argument of function {} with datepart '{}' "
"is allowed only when the 2nd argument has the type DateTime",
getName(), datepart_param);
};
if (arguments.size() == 2)
{
check_first_argument();
check_second_argument();
}
else if (arguments.size() == 3)
{
check_first_argument();
check_second_argument();
check_timezone_argument();
}
else
{
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Number of arguments for function {} doesn't match: passed {}, should be 2 or 3",
getName(), arguments.size());
}
if (result_type_is_date)
return std::make_shared<DataTypeDate>();
else
return std::make_shared<DataTypeDateTime>(extractTimeZoneNameFromFunctionArguments(arguments, 2, 1, false));
}
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {0, 2}; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
{
ColumnsWithTypeAndName temp_columns(arguments.size());
temp_columns[0] = arguments[1];
const UInt16 interval_value = 1;
const ColumnPtr interval_column = ColumnConst::create(ColumnInt64::create(1, interval_value), input_rows_count);
temp_columns[1] = {interval_column, std::make_shared<DataTypeInterval>(datepart_kind), ""};
auto to_start_of_interval = FunctionFactory::instance().get("toStartOfInterval", context);
if (arguments.size() == 2)
return to_start_of_interval->build(temp_columns)->execute(temp_columns, result_type, input_rows_count);
temp_columns[2] = arguments[2];
return to_start_of_interval->build(temp_columns)->execute(temp_columns, result_type, input_rows_count);
}
bool hasInformationAboutMonotonicity() const override
{
return true;
}
Monotonicity getMonotonicityForRange(const IDataType &, const Field &, const Field &) const override
{
return { .is_monotonic = true, .is_always_monotonic = true };
}
private:
ContextPtr context;
mutable IntervalKind::Kind datepart_kind = IntervalKind::Kind::Second;
};
}
REGISTER_FUNCTION(DateTrunc)
{
factory.registerFunction<FunctionDateTrunc>();
/// Compatibility alias.
factory.registerAlias("DATE_TRUNC", "dateTrunc", FunctionFactory::CaseInsensitive);
}
}
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