diff --git a/datafusion-postgres/src/lib.rs b/datafusion-postgres/src/lib.rs
index aeee0e5..1161c50 100644
--- a/datafusion-postgres/src/lib.rs
+++ b/datafusion-postgres/src/lib.rs
@@ -1,6 +1,6 @@
 mod handlers;
 pub mod pg_catalog;
-mod sql;
+pub mod sql;
 
 use std::fs::File;
 use std::io::{BufReader, Error as IOError, ErrorKind};
diff --git a/datafusion-postgres/src/sql/parser.rs b/datafusion-postgres/src/sql/parser.rs
index 862c830..7c09f3d 100644
--- a/datafusion-postgres/src/sql/parser.rs
+++ b/datafusion-postgres/src/sql/parser.rs
@@ -177,6 +177,12 @@ pub struct PostgresCompatibilityParser {
     rewrite_rules: Vec<Arc<dyn SqlStatementRewriteRule>>,
 }
 
+impl Default for PostgresCompatibilityParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl PostgresCompatibilityParser {
     pub fn new() -> Self {
         let mut mapping = Vec::with_capacity(BLACKLIST_SQL_MAPPING.len());
diff --git a/datafusion-postgres/src/sql/rules.rs b/datafusion-postgres/src/sql/rules.rs
index 18523cf..b6ddc65 100644
--- a/datafusion-postgres/src/sql/rules.rs
+++ b/datafusion-postgres/src/sql/rules.rs
@@ -266,6 +266,12 @@ pub struct RemoveUnsupportedTypes {
     unsupported_types: HashSet<String>,
 }
 
+impl Default for RemoveUnsupportedTypes {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RemoveUnsupportedTypes {
     pub fn new() -> Self {
         let mut unsupported_types = HashSet::new();