Scope

• Vendor a decimal128 library.
• Support encoding, edge generation, and min cover of a BSON decimal128.

Background & Motivation

Relevant server code is in fle_crypto.cpp
Encoding in the server code is in getTypeInfoDecimal128 Port to mc-range-encoding.c.
Edge generation is in server code in getEdgesDecimal128. Port to mc-range-edge-generation.c.
MinCover is in server code in minCoverDecimal128. Port to mc-range-mincover.c.

This will require a dependency on a decimal128 library. DBX Scope: Driver Support for Range Index suggests "Import libtommath or tomsfastmath or similar to perform int128 math". The server vendors the Intel Decimal Floating-Point Math Library v2.1: https://github.com/mongodb/mongo/tree/master/src/third_party/IntelRDFPMathLib20U1