diff --git a/be/src/exprs/string_functions.cpp b/be/src/exprs/string_functions.cpp
index b9feb4c424..d2af736250 100644
--- a/be/src/exprs/string_functions.cpp
+++ b/be/src/exprs/string_functions.cpp
@@ -796,7 +796,6 @@ StringVal StringFunctions::split_part(FunctionContext* context, const StringVal&
         return StringVal::null();
     }
     std::vector<int> find(field.val, -1); //store substring position
-    for (int i = 0; i <= field.val; i++) find[i] = -1; // init
     int from = 0;
     for (int i = 1; i <= field.val; i++) { // find
         int last_index = i - 1;
diff --git a/be/test/exprs/string_functions_test.cpp b/be/test/exprs/string_functions_test.cpp
index fe7380a67e..bd7e9ae9f8 100644
--- a/be/test/exprs/string_functions_test.cpp
+++ b/be/test/exprs/string_functions_test.cpp
@@ -160,7 +160,6 @@ TEST_F(StringFunctionsTest, split_part) {
 }
 
 int main(int argc, char** argv) {
-    doris::init_glog("be-test");
     ::testing::InitGoogleTest(&argc, argv);
     return RUN_ALL_TESTS();
 }
diff --git a/be/test/util/tdigest_test.cpp b/be/test/util/tdigest_test.cpp
index b0aef3e2b9..eeba09563e 100644
--- a/be/test/util/tdigest_test.cpp
+++ b/be/test/util/tdigest_test.cpp
@@ -59,16 +59,6 @@ protected:
     // Objects declared here can be used by all tests in the test case for Foo.
 };
 
-static double cdf(const double x, const std::vector<double>& data) {
-    int n1 = 0;
-    int n2 = 0;
-    for (auto v : data) {
-        n1 += (v < x) ? 1 : 0;
-        n2 += (v <= x) ? 1 : 0;
-    }
-    return (n1 + n2) / 2.0 / data.size();
-}
-
 static double quantile(const double q, const std::vector<double>& values) {
     double q1;
     if (values.size() == 0) {