diff --git a/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java b/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java
index 35077b05f99e1c..2afe97523f018d 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/analysis/ExprSubstitutionMap.java
@@ -279,17 +279,21 @@ public String debugString() {
      * and that all rhs exprs are analyzed.
      */
     private void verify() {
-        for (int i = 0; i < lhs_.size(); ++i) {
-            for (int j = i + 1; j < lhs_.size(); ++j) {
-                if (lhs_.get(i).equals(lhs_.get(j))) {
-                    if (LOG.isTraceEnabled()) {
-                        LOG.trace("verify: smap=" + this.debugString());
+        // This method is very very time consuming, especially when planning large complex query.
+        // So disable it by default.
+        if (LOG.isDebugEnabled()) {
+            for (int i = 0; i < lhs_.size(); ++i) {
+                for (int j = i + 1; j < lhs_.size(); ++j) {
+                    if (lhs_.get(i).equals(lhs_.get(j))) {
+                        if (LOG.isTraceEnabled()) {
+                            LOG.trace("verify: smap=" + this.debugString());
+                        }
+                        // TODO(zc): partition by k1, order by k1, there is failed.
+                        // Preconditions.checkState(false);
                     }
-                    // TODO(zc): partition by k1, order by k1, there is failed.
-                    // Preconditions.checkState(false);
                 }
+                Preconditions.checkState(!checkAnalyzed_ || rhs_.get(i).isAnalyzed());
             }
-            Preconditions.checkState(!checkAnalyzed_ || rhs_.get(i).isAnalyzed());
         }
     }
 
diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java b/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java
index cd8d07828cab31..9e806fa05a1062 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java
@@ -150,8 +150,6 @@ public class Coordinator {
     // copied from TQueryExecRequest; constant across all fragments
     private TDescriptorTable descTable;
 
-    private Set<Long> alreadySentBackendIds = Sets.newHashSet();
-
     // Why do we use query global?
     // When `NOW()` function is in sql, we need only one now(),
     // but, we execute `NOW()` distributed.
@@ -390,7 +388,6 @@ public void clearExportStatus() {
             }
             this.exportFiles.clear();
             this.needCheckBackendExecStates.clear();
-            this.alreadySentBackendIds.clear();
         } finally {
             lock.unlock();
         }
@@ -716,9 +713,6 @@ private void waitRpc(List<Pair<BackendExecStates, Future<PExecPlanFragmentResult
                         throw new UserException(errMsg, exception);
                 }
             }
-
-            // succeed to send the plan fragment, update the "alreadySentBackendIds"
-            alreadySentBackendIds.add(pair.first.beId);
         }
     }
 
@@ -2002,15 +1996,11 @@ public BackendExecState(PlanFragmentId fragmentId, int instanceId, int profileFr
          * This information can be obtained from the cache of BE.
          */
         public void unsetFields() {
-            if (alreadySentBackendIds.contains(backend.getId())) {
-                this.rpcParams.unsetDescTbl();
-                this.rpcParams.unsetCoord();
-                this.rpcParams.unsetQueryGlobals();
-                this.rpcParams.unsetResourceInfo();
-                this.rpcParams.setIsSimplifiedParam(true);
-            } else {
-                this.rpcParams.setIsSimplifiedParam(false);
-            }
+            this.rpcParams.unsetDescTbl();
+            this.rpcParams.unsetCoord();
+            this.rpcParams.unsetQueryGlobals();
+            this.rpcParams.unsetResourceInfo();
+            this.rpcParams.setIsSimplifiedParam(true);
         }
 
         // update profile.