diff --git a/fe/src/main/java/org/apache/doris/catalog/ScalarType.java b/fe/src/main/java/org/apache/doris/catalog/ScalarType.java
index b8f99c176c1bdb..7a04913e2db32c 100644
--- a/fe/src/main/java/org/apache/doris/catalog/ScalarType.java
+++ b/fe/src/main/java/org/apache/doris/catalog/ScalarType.java
@@ -22,11 +22,12 @@
 import org.apache.doris.thrift.TTypeDesc;
 import org.apache.doris.thrift.TTypeNode;
 import org.apache.doris.thrift.TTypeNodeType;
+
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
 
-import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 /**
  * Describes a scalar type. For most types this class just wraps a PrimitiveType enum,
@@ -329,7 +330,7 @@ public String toSql(int depth) {
                 stringBuilder.append(type.toString().toLowerCase());
                 break;
             default:
-                stringBuilder.append("unknown");
+                stringBuilder.append("unknown type: " + type.toString());
                 break;
         }
         return stringBuilder.toString();
diff --git a/fe/src/main/java/org/apache/doris/planner/PartitionColumnFilter.java b/fe/src/main/java/org/apache/doris/planner/PartitionColumnFilter.java
index 817dd91181c7eb..5fd47f94f6ce4a 100644
--- a/fe/src/main/java/org/apache/doris/planner/PartitionColumnFilter.java
+++ b/fe/src/main/java/org/apache/doris/planner/PartitionColumnFilter.java
@@ -113,20 +113,20 @@ public Range<PartitionKey> getRange(List<Column> columns) {
     public String toString() {
         String str = "";
         if (null == lowerBound) {
-            str += "lowerBound is NULL";
+            str += "lowerBound is UNSET";
         } else {
             str += "lowerBound is " + lowerBound.getStringValue() + " and lowerBoundInclusive is " +
               lowerBoundInclusive;
         }
         if (null == upperBound) {
-            str += "\nupperBound is NULL";
+            str += "\nupperBound is UNSET";
         } else {
             str +=
               "\nupperBound is " + upperBound.getStringValue() + " and upperBoundInclusive is " +
                 upperBoundInclusive;
         }
         if (null == inPredicate) {
-            str += "\ninPredicate is NULL";
+            str += "\ninPredicate is UNSET";
         } else {
             str += "\ninPredicate is " + inPredicate;
         }
diff --git a/fe/src/main/java/org/apache/doris/planner/SingleNodePlanner.java b/fe/src/main/java/org/apache/doris/planner/SingleNodePlanner.java
index 5d636ec9db7451..06601366bfb19e 100644
--- a/fe/src/main/java/org/apache/doris/planner/SingleNodePlanner.java
+++ b/fe/src/main/java/org/apache/doris/planner/SingleNodePlanner.java
@@ -17,17 +17,48 @@
 
 package org.apache.doris.planner;
 
+import org.apache.doris.analysis.AggregateInfo;
+import org.apache.doris.analysis.AnalyticInfo;
+import org.apache.doris.analysis.Analyzer;
+import org.apache.doris.analysis.BaseTableRef;
+import org.apache.doris.analysis.BinaryPredicate;
+import org.apache.doris.analysis.CaseExpr;
+import org.apache.doris.analysis.CastExpr;
+import org.apache.doris.analysis.DescriptorTable;
+import org.apache.doris.analysis.Expr;
+import org.apache.doris.analysis.ExprSubstitutionMap;
+import org.apache.doris.analysis.FunctionCallExpr;
+import org.apache.doris.analysis.InPredicate;
+import org.apache.doris.analysis.InlineViewRef;
+import org.apache.doris.analysis.IsNullPredicate;
+import org.apache.doris.analysis.JoinOperator;
+import org.apache.doris.analysis.LiteralExpr;
+import org.apache.doris.analysis.NullLiteral;
+import org.apache.doris.analysis.QueryStmt;
+import org.apache.doris.analysis.SelectStmt;
+import org.apache.doris.analysis.SlotDescriptor;
+import org.apache.doris.analysis.SlotId;
+import org.apache.doris.analysis.SlotRef;
+import org.apache.doris.analysis.TableRef;
+import org.apache.doris.analysis.TupleDescriptor;
+import org.apache.doris.analysis.TupleId;
+import org.apache.doris.analysis.TupleIsNullPredicate;
+import org.apache.doris.analysis.UnionStmt;
+import org.apache.doris.catalog.AggregateType;
+import org.apache.doris.catalog.Column;
+import org.apache.doris.catalog.MysqlTable;
+import org.apache.doris.catalog.Table;
+import org.apache.doris.common.AnalysisException;
+import org.apache.doris.common.Pair;
+import org.apache.doris.common.Reference;
+import org.apache.doris.common.UserException;
+
 import com.google.common.base.Preconditions;
 import com.google.common.base.Predicate;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
-import org.apache.doris.analysis.*;
-import org.apache.doris.catalog.AggregateType;
-import org.apache.doris.catalog.Column;
-import org.apache.doris.catalog.MysqlTable;
-import org.apache.doris.catalog.Table;
-import org.apache.doris.common.*;
+
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -809,13 +840,14 @@ private PartitionColumnFilter createPartitionFilter(SlotDescriptor desc, List<Ex
                 if (!isNullPredicate.isSlotRefChildren() || isNullPredicate.isNotNull()) {
                     continue;
                 }
-                if (null == partitionColumnFilter) {
-                    partitionColumnFilter = new PartitionColumnFilter();
-                }
-                // like EQ
+
+                // If we meet a IsNull predicate on partition column, then other predicates are useless
+                // eg: (xxxx) and (col is null), only the IsNull predicate has an effect on partition pruning.
+                partitionColumnFilter = new PartitionColumnFilter();
                 NullLiteral nullLiteral = new NullLiteral();
                 partitionColumnFilter.setLowerBound(nullLiteral, true);
                 partitionColumnFilter.setUpperBound(nullLiteral, true);
+                break;
             }
         }
         LOG.debug("partitionColumnFilter: {}", partitionColumnFilter);