diff --git a/src/sql/expression.rs b/src/sql/expression.rs
index 352791ed..0a9af0c2 100644
--- a/src/sql/expression.rs
+++ b/src/sql/expression.rs
@@ -111,7 +111,7 @@ pub fn expression(i: &str) -> IResult<&str, Expression> {
 	alt((binary, single))(i)
 }
 
-fn binary(i: &str) -> IResult<&str, Expression> {
+pub fn binary(i: &str) -> IResult<&str, Expression> {
 	let (i, l) = literal(i)?;
 	let (i, _) = mightbespace(i)?;
 	let (i, o) = operator(i)?;
@@ -120,7 +120,7 @@ fn binary(i: &str) -> IResult<&str, Expression> {
 	Ok((i, Expression::Binary(Box::new(l), o, Box::new(r))))
 }
 
-fn single(i: &str) -> IResult<&str, Expression> {
+pub fn single(i: &str) -> IResult<&str, Expression> {
 	let (i, l) = literal(i)?;
 	Ok((i, Expression::Single(Box::new(l))))
 }
diff --git a/src/sql/function.rs b/src/sql/function.rs
index 45397b59..fee748b4 100644
--- a/src/sql/function.rs
+++ b/src/sql/function.rs
@@ -6,7 +6,7 @@ use crate::err::Error;
 use crate::fnc;
 use crate::sql::comment::mightbespace;
 use crate::sql::common::commas;
-use crate::sql::expression::{expression, Expression};
+use crate::sql::expression::{expression, single, Expression};
 use crate::sql::literal::Literal;
 use nom::branch::alt;
 use nom::bytes::complete::tag;
@@ -95,7 +95,7 @@ fn casts(i: &str) -> IResult<&str, Function> {
 	let (i, s) = function_casts(i)?;
 	let (i, _) = tag(">")(i)?;
 	let (i, _) = mightbespace(i)?;
-	let (i, v) = expression(i)?;
+	let (i, v) = single(i)?;
 	Ok((i, Function::Cast(s.to_string(), v)))
 }