Method transformHeader

src/Processors/Transforms/MarkDistinctTransform.cpp:13–20

}

Block MarkDistinctTransform::transformHeader(Block header, String marker_symbol)
{
    auto type_int = std::make_shared<DataTypeUInt8>();
    MutableColumnPtr column = type_int->createColumn();
    ColumnWithTypeAndName unique{std::move(column), type_int, marker_symbol};
    header.insert(unique);
    return header;
}

MarkDistinctTransform::MarkDistinctTransform(const Block & header_, String marker_symbol_, std::vector<String> distinct_symbols_)
    : ISimpleTransform(header_, transformHeader(header_, marker_symbol_), false)