Add aggregate strategies support (lateral & grouped)

CHANGELOG.md

@@ -11,6 +11,17 @@ See [Conventional Commits](Https://conventionalcommits.org) for commit guideline
 
 <!-- changelog -->
 
+## Unreleased
+
+### Features:
+
+* add strategy-aware aggregate dispatch with lateral and grouped aggregate implementations
+
+### Improvements:
+
+* add grouped query aggregate support for root SQLite-compatible aggregate kinds
+* declare `:jason` as a direct dependency for grouped list aggregate defaults
+
 ## [v0.6.3](https://github.com/ash-project/ash_sql/compare/v0.6.2...v0.6.3) (2026-05-03)
 
 

README.md

@@ -23,3 +23,12 @@ def deps do
   ]
 end
 ```
+
+## Aggregate Strategies
+
+`AshSql.Implementation` defaults aggregate planning to `:lateral`. SQL data
+layers can override `aggregate_strategy/1` with `:grouped` when they need the
+SQLite-style grouped aggregate implementation.
+
+The grouped strategy uses native aggregate `FILTER` support and JSON-backed list
+aggregate defaults.