Function extractValuesGeneric

src/DataTypes/DataTypeMapHelpers.cpp:223–236

Generic value extractor using virtual insertFrom / insertDefault.

/// Generic value extractor using virtual insertFrom / insertDefault.
void extractValuesGeneric(
    const IColumn & values_column,
    IColumn & result,
    const PaddedPODArray<size_t> & matched_positions)
{
    result.reserve(result.size() + matched_positions.size());
    for (size_t pos : matched_positions)
    {
        if (pos != KEY_NOT_FOUND)
            result.insertFrom(values_column, pos);
        else
            result.insertDefault();
    }
}

/// Specialized value extractor for ColumnVector<T>, with optional Nullable support.
/// If src_null_map / dst_null_map are non-null, propagates null flags.