UUID support in search stream API endpoint

[noonat]

Is your feature request related to a problem? Please describe. I am using Quickwit to ingest logs, and would like to make use of the ClickHouse integration to find associated data in ClickHouse. However, the join field is a UUID, which is currently being stored as a string in Quickwit. The stream endpoint is limited to returning int64 or uin64 values, which means there isn't a way for us to use this with UUIDs.

Describe the solution you'd like It would be ideal if either:

• UUID was supported as a first class type in the index and allowed as a stream field, returned in ClickHouse native UUID format. (This is a binary format where the UUID is split into 2 uint64 values.)
• or if strings were allowed as a stream field

Describe alternatives you've considered I can't see any alternatives, as storing the UUID as an integer would require 128-bit integer support. The current workaround I am using is to use a custom HTTP server to emulate the stream endpoint and do paged requests to the search endpoint, which is obviously far less performant than using the stream endpoint would be.