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#include <Functions/replicate.h>
#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <DataTypes/DataTypeArray.h>
#include <Columns/ColumnArray.h>
#include <Interpreters/Context.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int ILLEGAL_COLUMN;
extern const int TOO_FEW_ARGUMENTS_FOR_FUNCTION;
}
DataTypePtr FunctionReplicate::getReturnTypeImpl(const DataTypes & arguments) const
{
if (arguments.size() < 2)
throw Exception(ErrorCodes::TOO_FEW_ARGUMENTS_FOR_FUNCTION,
"Function {} expect at least two arguments, got {}", getName(), arguments.size());
for (size_t i = 1; i < arguments.size(); ++i)
{
const DataTypeArray * array_type = checkAndGetDataType<DataTypeArray>(arguments[i].get());
if (!array_type)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Argument {} for function {} must be array.",
i + 1, getName());
}
return std::make_shared<DataTypeArray>(arguments[0]);
}
ColumnPtr FunctionReplicate::executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t) const
{
ColumnPtr first_column = arguments[0].column;
ColumnPtr offsets;
for (size_t i = 1; i < arguments.size(); ++i)
{
const ColumnArray * array_column = checkAndGetColumn<ColumnArray>(arguments[i].column.get());
ColumnPtr temp_column;
if (!array_column)
{
const auto * const_array_column = checkAndGetColumnConst<ColumnArray>(arguments[i].column.get());
if (!const_array_column)
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Unexpected column for replicate");
temp_column = const_array_column->convertToFullColumn();
array_column = checkAndGetColumn<ColumnArray>(temp_column.get());
}
if (!offsets || offsets->empty())
offsets = array_column->getOffsetsPtr();
}
const auto & offsets_data = assert_cast<const ColumnArray::ColumnOffsets &>(*offsets).getData(); /// NOLINT
return ColumnArray::create(first_column->replicate(offsets_data)->convertToFullColumnIfConst(), offsets);
}
REGISTER_FUNCTION(Replicate)
{
factory.registerFunction<FunctionReplicate>();
}
}
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