Ensure all necessary SQL types are publicly exported

lib/src/sql/expression.rs

@@ -12,9 +12,9 @@ use std::str;
 
 #[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Serialize, Deserialize)]
 pub struct Expression {
-	l: Value,
-	o: Operator,
-	r: Value,
+	pub l: Value,
+	pub o: Operator,
+	pub r: Value,
 }
 
 impl Default for Expression {

lib/src/sql/mod.rs

@@ -68,6 +68,7 @@ pub use self::field::Field;
 pub use self::field::Fields;
 pub use self::function::Function;
 pub use self::geometry::Geometry;
+pub use self::graph::Dir;
 pub use self::graph::Graph;
 pub use self::group::Group;
 pub use self::group::Groups;
@@ -80,6 +81,7 @@ pub use self::limit::Limit;
 pub use self::model::Model;
 pub use self::number::Number;
 pub use self::object::Object;
+pub use self::operation::Op;
 pub use self::operation::Operation;
 pub use self::operator::Operator;
 pub use self::order::Order;

lib/src/sql/query.rs

@@ -7,7 +7,7 @@ use std::str;
 
 #[derive(Clone, Debug, Default, Eq, PartialEq, Serialize, Deserialize)]
 pub struct Query {
-	statements: Statements,
+	pub statements: Statements,
 }
 
 impl Query {