EQL documentation

July 23, 2026 · View on GitHub

This directory contains the documentation for the Encrypt Query Language (EQL).

About

EQL Functions Reference - Complete API reference for all EQL functions
SQL support matrix - Which SQL operators and features each encrypted-domain variant enables
Database Indexes for Encrypted Columns - Index recipes (hash / btree / GIN), engagement rules, and build performance for encrypted columns
Writing fast queries against EQL columns - Performance overview (points to Database Indexes)
Adding a Scalar Encrypted-Domain Type - How the eql_v3.<T> domain families are generated
EQL with JSON and JSONB
EQL payload / wire format - Canonical wire types for the encrypted payload (envelope v/i/c and the hm/op/ob/bf index terms)
Client-side index configuration - Configuring searchable encryption in CipherStash Stack / CipherStash Proxy