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type StringField inteface { 
extract(segmentOffsets []int32) []string

serialize() []bytes

deserialize([]bytes)

}
func Filter(expression string, field StringField) sgementOffsets []int32

class HistoricalStringField1 {
std::vector<string> strs;

std::unordered_map<int32, std::vector<int32>> strOffsetToSegOffsets;

std::vector<int32> segOffsetToStrOffset;

std::vector<string> 
extract(const std::vector<int32>& segmentOffsets);

std::vector<Blob>
serialize();

void
deserialize(const std::vector<Blob>&)

}

class Blob {
std::vector<char> blob_;
}

class StreamingStringField {

std::vector<string> strs;

std::vector<string> 
extract(const std::vector<int32>& segmentOffsets);

std::vector<Blob>
serialize();

void
deserialize(const std::vector<Blob>&)

}
class Blob {
std::vector<char> blob_;
}