[FEAT]: expr simplifier

src/daft-logical-plan/src/optimization/optimizer.rs

@@ -93,6 +93,13 @@ impl Optimizer {
     pub fn new(config: OptimizerConfig) -> Self {
         let mut rule_batches = Vec::new();
 
+        // we want to simplify expressions first to make the rest of the rules easier
+        // dbg
+        // rule_batches.push(RuleBatch::new(
+        //     vec![Box::new(SimplifyExpressionsRule::new())],
+        //     RuleExecutionStrategy::FixedPoint(Some(3)),
+        // ));
+
         // --- Split ActorPoolProjection nodes from Project nodes ---
         // This is feature-flagged behind DAFT_ENABLE_ACTOR_POOL_PROJECTIONS=1
         if config.enable_actor_pool_projections {

src/daft-logical-plan/src/optimization/rules/mod.rs

@@ -5,6 +5,7 @@ mod push_down_filter;
 mod push_down_limit;
 mod push_down_projection;
 mod rule;
+mod simplify_expressions;
 mod split_actor_pool_projects;
 
 pub use drop_repartition::DropRepartition;
@@ -14,4 +15,6 @@ pub use push_down_filter::PushDownFilter;
 pub use push_down_limit::PushDownLimit;
 pub use push_down_projection::PushDownProjection;
 pub use rule::OptimizerRule;
+#[allow(unused_imports)]
+pub use simplify_expressions::SimplifyExpressionsRule;
 pub use split_actor_pool_projects::SplitActorPoolProjects;