diff --git a/datafusion/sql/src/expr/mod.rs b/datafusion/sql/src/expr/mod.rs
index 5480c8d1d335d..080e92369695d 100644
--- a/datafusion/sql/src/expr/mod.rs
+++ b/datafusion/sql/src/expr/mod.rs
@@ -67,7 +67,7 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
     }
 
     /// Generate a relational expression from a SQL expression
-    pub(crate) fn sql_to_rex(
+    pub fn sql_to_rex(
         &self,
         sql: SQLExpr,
         schema: &DFSchema,
diff --git a/datafusion/sql/src/planner.rs b/datafusion/sql/src/planner.rs
index 9e158291837fe..80b8d4064a3b6 100644
--- a/datafusion/sql/src/planner.rs
+++ b/datafusion/sql/src/planner.rs
@@ -394,7 +394,9 @@ mod tests {
 
     use sqlparser::dialect::{Dialect, GenericDialect, HiveDialect, MySqlDialect};
 
-    use datafusion_common::assert_contains;
+    use datafusion_common::{assert_contains, ScalarValue};
+    use datafusion_expr::logical_plan::Prepare;
+    use crate::parser::DFParser;
 
     use super::*;
 
diff --git a/datafusion/sql/src/query.rs b/datafusion/sql/src/query.rs
index b7cf29138c946..57fd8674ca98c 100644
--- a/datafusion/sql/src/query.rs
+++ b/datafusion/sql/src/query.rs
@@ -1,3 +1,20 @@
+// 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.
+
 use crate::planner::{ContextProvider, PlannerContext, SqlToRel};
 use crate::utils::normalize_ident;
 use datafusion_common::{DFSchema, DataFusionError, Result, ScalarValue};
diff --git a/datafusion/sql/src/relation/join.rs b/datafusion/sql/src/relation/join.rs
index f31039ec7023b..7ee7d01bc7185 100644
--- a/datafusion/sql/src/relation/join.rs
+++ b/datafusion/sql/src/relation/join.rs
@@ -1,3 +1,20 @@
+// 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.
+
 use crate::planner::{ContextProvider, PlannerContext, SqlToRel};
 use crate::utils::normalize_ident;
 use datafusion_common::{Column, DFSchemaRef, DataFusionError, Result};
diff --git a/datafusion/sql/src/relation/mod.rs b/datafusion/sql/src/relation/mod.rs
index 7e0b155ba61a8..852e9afdbf048 100644
--- a/datafusion/sql/src/relation/mod.rs
+++ b/datafusion/sql/src/relation/mod.rs
@@ -1,3 +1,20 @@
+// 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.
+
 use crate::planner::{
     object_name_to_table_reference, ContextProvider, PlannerContext, SqlToRel,
 };
diff --git a/datafusion/sql/src/statement.rs b/datafusion/sql/src/statement.rs
index eaed2448d38ea..b6218c5f5bd91 100644
--- a/datafusion/sql/src/statement.rs
+++ b/datafusion/sql/src/statement.rs
@@ -1,3 +1,20 @@
+// 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.
+
 use crate::parser::{
     CreateExternalTable, DFParser, DescribeTable, Statement as DFStatement,
 };
@@ -36,7 +53,7 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
     }
 
     /// Generate a logical plan from an SQL statement
-    fn sql_statement_to_plan(&self, statement: Statement) -> Result<LogicalPlan> {
+    pub fn sql_statement_to_plan(&self, statement: Statement) -> Result<LogicalPlan> {
         self.sql_statement_to_plan_with_context(statement, &mut PlannerContext::new())
     }