diff --git a/core/src/test/scala/org/apache/spark/sql/IssueTestSuite.scala b/core/src/test/scala/org/apache/spark/sql/IssueTestSuite.scala
index 270a2dab04..d8cb9efb98 100644
--- a/core/src/test/scala/org/apache/spark/sql/IssueTestSuite.scala
+++ b/core/src/test/scala/org/apache/spark/sql/IssueTestSuite.scala
@@ -22,6 +22,29 @@ import org.apache.spark.sql.functions.{col, sum}
 
 class IssueTestSuite extends BaseTiSparkTest {
 
+  test("test read tiflash not null error") {
+    if (!enableTiFlashTest) {
+      cancel("tiflash test not enabled")
+    }
+    val dbTable = "test.tiflash_not_null"
+    tidbStmt.execute(s"drop table if exists $dbTable")
+    tidbStmt.execute(s"CREATE TABLE $dbTable (`a` int NOT NULL)")
+    tidbStmt.execute(s"ALTER TABLE $dbTable SET TIFLASH REPLICA 1")
+
+    Thread.sleep(5 * 1000)
+
+    val prev = spark.conf.getOption(TiConfigConst.ISOLATION_READ_ENGINES)
+    try {
+      spark.conf
+        .set(TiConfigConst.ISOLATION_READ_ENGINES, TiConfigConst.TIFLASH_STORAGE_ENGINE)
+      spark.sql(s"select max(a) from tidb_catalog.$dbTable").show()
+    } finally {
+      spark.conf.set(
+        TiConfigConst.ISOLATION_READ_ENGINES,
+        prev.getOrElse(TiConfigConst.DEFAULT_STORAGE_ENGINES))
+    }
+  }
+
   test("test column mismatch, issue 2750") {
     val dbTable = "tispark_test.column_mismatch"
     tidbStmt.execute(s"drop table if exists $dbTable")
diff --git a/tikv-client/scripts/proto.sh b/tikv-client/scripts/proto.sh
index e8195e6e34..c47884b5ea 100755
--- a/tikv-client/scripts/proto.sh
+++ b/tikv-client/scripts/proto.sh
@@ -22,7 +22,7 @@ kvproto_hash=4d69c6f95e683dfb5859277563bf896aca06ec34
 
 raft_rs_hash=b9891b673573fad77ebcf9bbe0969cf945841926
 
-tipb_hash=45e60c77588fefe421d0f6f29426a36b5b15171d
+tipb_hash=29e23c62eeace5912f696d1b184b63d5dc3edcce
 
 if [ -d "kvproto" ]; then
 	cd kvproto; git fetch -p; git checkout ${kvproto_hash}; cd ..
diff --git a/tikv-client/src/main/java/com/pingcap/tikv/expression/visitor/ProtoConverter.java b/tikv-client/src/main/java/com/pingcap/tikv/expression/visitor/ProtoConverter.java
index 353b8dc0c5..7cbc0421db 100644
--- a/tikv-client/src/main/java/com/pingcap/tikv/expression/visitor/ProtoConverter.java
+++ b/tikv-client/src/main/java/com/pingcap/tikv/expression/visitor/ProtoConverter.java
@@ -16,6 +16,7 @@
 
 package com.pingcap.tikv.expression.visitor;
 
+import static com.pingcap.tidb.tipb.AggFunctionMode.Partial1Mode;
 import static java.util.Objects.requireNonNull;
 
 import com.google.common.collect.ImmutableMap;
@@ -350,6 +351,7 @@ protected Expr visit(AggregateFunction node, Object context) {
     }
 
     builder.setFieldType(toPBFieldType(getType(node)));
+    builder.setAggFuncMode(Partial1Mode);
     return builder.build();
   }