remove unused methods from Arguments: is_empty, len, size

sqlx-core/src/arguments.rs

@@ -8,18 +8,6 @@ use crate::types::HasSqlType;
 pub trait Arguments: Send + Sized + Default + 'static {
     type Database: Database + ?Sized;
 
-    /// Returns `true` if there are no values.
-    #[inline]
-    fn is_empty(&self) -> bool {
-        self.len() == 0
-    }
-
-    /// Returns the number of values.
-    fn len(&self) -> usize;
-
-    /// Returns the size of the arguments, in bytes.
-    fn size(&self) -> usize;
-
     /// Reserves the capacity for at least `len` more values (of `size` bytes) to
     /// be added to the arguments without a reallocation.  
     fn reserve(&mut self, len: usize, size: usize);

sqlx-core/src/mysql/arguments.rs

@@ -14,14 +14,6 @@ pub struct MySqlArguments {
 impl Arguments for MySqlArguments {
     type Database = MySql;
 
-    fn len(&self) -> usize {
-        self.param_types.len()
-    }
-
-    fn size(&self) -> usize {
-        self.params.len()
-    }
-
     fn reserve(&mut self, len: usize, size: usize) {
         self.param_types.reserve(len);
         self.params.reserve(size);

sqlx-core/src/postgres/arguments.rs

@@ -18,14 +18,6 @@ pub struct PgArguments {
 impl Arguments for PgArguments {
     type Database = super::Postgres;
 
-    fn len(&self) -> usize {
-        self.types.len()
-    }
-
-    fn size(&self) -> usize {
-        self.values.len()
-    }
-
     fn reserve(&mut self, len: usize, size: usize) {
         self.types.reserve(len);
         self.values.reserve(size);