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#include <Interpreters/castColumn.h>
#include <Functions/FunctionsConversion.h>
#include <Functions/CastOverloadResolver.h>
namespace DB
{
template <CastType cast_type = CastType::nonAccurate>
static ColumnPtr castColumn(const ColumnWithTypeAndName & arg, const DataTypePtr & type)
{
if (arg.type->equals(*type) && cast_type != CastType::accurateOrNull)
return arg.column;
ColumnsWithTypeAndName arguments
{
arg,
{
DataTypeString().createColumnConst(arg.column->size(), type->getName()),
std::make_shared<DataTypeString>(),
""
}
};
FunctionOverloadResolverPtr func_builder_cast = CastInternalOverloadResolver<cast_type>::createImpl();
auto func_cast = func_builder_cast->build(arguments);
if constexpr (cast_type == CastType::accurateOrNull)
{
return func_cast->execute(arguments, makeNullable(type), arg.column->size());
}
else
{
return func_cast->execute(arguments, type, arg.column->size());
}
}
ColumnPtr castColumn(const ColumnWithTypeAndName & arg, const DataTypePtr & type)
{
return castColumn<CastType::nonAccurate>(arg, type);
}
ColumnPtr castColumnAccurate(const ColumnWithTypeAndName & arg, const DataTypePtr & type)
{
return castColumn<CastType::accurate>(arg, type);
}
ColumnPtr castColumnAccurateOrNull(const ColumnWithTypeAndName & arg, const DataTypePtr & type)
{
return castColumn<CastType::accurateOrNull>(arg, type);
}
}
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