package arcticc.pb2.column_stats_pb2

Stored in the user defined metadata for KeyType::COLUMN_STATS

uint32 version = 1
This version number refers to the format of this header structure. Increment the version number if the meaning of the fields changes, to help older clients avoid mis-interpreting data written by newer clients.
map<uint32, StatEntryList> stats_by_column = 2
key = data_col_offset (offset in to TimeseriesDescriptor#fields_ in the Index key)
end of fields in version 1

UNKNOWN = 0
Older clients reading a new enum value written by a newer client will decode to this first element, so make sure they don't mis-interpret it as a statistic they understand. https://protobuf.dev/best-practices/dos-donts/#unspecified-enum
MIN_V1 = 1
The version numbers here refer to the format of a given statistic. For example we might start off saving string min and max truncated to 8 bytes in a uint64_t, and later change to saving it truncated to a different length. That would necessitate a MIN_V2 so that old readers do not misinterpret the new statistics format.
MAX_V1 = 2
NAN_COUNT_V1 = 3
NULL_COUNT_V1 = 4