Summary

Support multiple schemas for a single auto-encryption operation.

Background & Motivation

Needed for $lookup support. A $lookup can reference multiple collections.

See Technical Design: Support $lookup in CSFLE and QE for a description of the new csfleEncryptionSchemas field.

Proposed behavior

• If QE schemas are found (and no JSON schemas), only pass encryptionInformation. Use empty entries for collections with no schema.
• If JSON schemas are found (and no QE schemas), only pass csfleEncryptionSchemas. Use empty entries for collections with no schema.
• If both QE and JSON schemas are found:
  • If there is a remote JSON schema return an error. Tell user to specify collections in encryptedFieldsMap to ignore the remote JSON schema. This is a short-term workaround for SERVER-100260.
  • Otherwise, pass both encryptionInformation and csfleEncryptionSchemas and let query analysis return an error.