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risingwavelabs · Nov 24, 2023 · d2fdd33 · d2fdd33
1 parent 88b1ff3
commit d2fdd33
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/frontend/src/optimizer/mod.rs b/src/frontend/src/optimizer/mod.rs
@@ -259,6 +259,7 @@ impl PlanRoot {
                 BatchExchange::new(plan, self.required_order.clone(), Distribution::Single).into();
         }
 
+        // Both two phase limit and topn could generate limit on top of the scan, so we push limit here.
         let plan = plan.optimize_by_rules(&OptimizationStage::new(
             "Push Limit To Scan",
             vec![BatchPushLimitToScanRule::create()],
@@ -298,6 +299,7 @@ impl PlanRoot {
             ctx.trace(plan.explain_to_string());
         }
 
+        // Both two phase limit and topn could generate limit on top of the scan, so we push limit here.
         let plan = plan.optimize_by_rules(&OptimizationStage::new(
             "Push Limit To Scan",
             vec![BatchPushLimitToScanRule::create()],