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QueryMutator
Discontinued Queryable and Enumerable extensions for automapping objects and mapping multiple expressions into one.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I used it to build an automapper-like library a while back. It is not supported, but you can take a look: QueryMutator. It was from a time I wanted to write as complex and as compact one-liners as possible.
My learning path was supporting linq2db, not short way. StackOverflow was original source to find something like, how to do if operator in Expression Tree, how to throw exception in Expression Tree, how to build dynamic filter, ect.