From f14e944477674d987b91a4edacadb58c759eb74d Mon Sep 17 00:00:00 2001
From: suibianwanwan <suibianwanwan33@foxmail.com>
Date: Mon, 7 Oct 2024 16:36:38 +0800
Subject: [PATCH] [CALCITE-6615] BindableTableScan estimateRowCount does not
 calculate push down filters

---
 .../main/java/org/apache/calcite/interpreter/Bindables.java  | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/src/main/java/org/apache/calcite/interpreter/Bindables.java b/core/src/main/java/org/apache/calcite/interpreter/Bindables.java
index 069a2cade459..f3a4d22ba12e 100644
--- a/core/src/main/java/org/apache/calcite/interpreter/Bindables.java
+++ b/core/src/main/java/org/apache/calcite/interpreter/Bindables.java
@@ -269,6 +269,11 @@ public static BindableTableScan create(RelOptCluster cluster,
           .itemIf("projects", projects, !projects.equals(identity()));
     }
 
+    @Override public double estimateRowCount(RelMetadataQuery mq) {
+      double f = filters.isEmpty() ? 1d : 0.5d;
+      return super.estimateRowCount(mq) * f;
+    }
+
     @Override public @Nullable RelOptCost computeSelfCost(RelOptPlanner planner,
         RelMetadataQuery mq) {
       boolean noPushing = filters.isEmpty()