diff --git a/datafusion/sqllogictest/test_files/position.slt b/datafusion/sqllogictest/test_files/position.slt
deleted file mode 100644
index c1141ab06943..000000000000
--- a/datafusion/sqllogictest/test_files/position.slt
+++ /dev/null
@@ -1,43 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-
-#   http://www.apache.org/licenses/LICENSE-2.0
-
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-# KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-
-# test position in select
-query I
-select position('world' in 'hello world');
-----
-7
-
-
-
-# test in expression
-query I
-select 1000 where position('world' in 'hello world') != 100;
-----
-1000
-
-
-# test in expression
-query I
-select 100000 where position('legend' in 'league of legend') = 11;
-----
-100000
-
-
-# test in expression
-query I
-select 100000 where position('legend' in 'league of legend') != 11;
-----
diff --git a/datafusion/sqllogictest/test_files/scalar.slt b/datafusion/sqllogictest/test_files/scalar.slt
index ca313820ab02..cfc0caa90074 100644
--- a/datafusion/sqllogictest/test_files/scalar.slt
+++ b/datafusion/sqllogictest/test_files/scalar.slt
@@ -1957,3 +1957,42 @@ query T
 SELECT CASE 3 WHEN 1+2 THEN 'first' WHEN 1+1+1 THEN 'second' END
 ----
 first
+
+# position test
+query I
+select position('world' in 'hello world');
+----
+7
+
+# test in expression
+query I
+select 1000 where position('world' in 'hello world') != 100;
+----
+1000
+
+# test in expression
+query I
+select 100000 where position('legend' in 'league of legend') != 11;
+----
+
+# test in expression
+query I
+select 100000 where position('legend' in 'league of legend') = 11;
+----
+100000
+
+# test null
+query ?
+select position(null in null)
+----
+NULL
+
+
+query I
+select position('' in '')
+----
+1
+
+
+query error DataFusion error: Error during planning: The "instr" function can only accept strings, but got Int64\.
+select position(1 in 1)