chore(mysql): make Row::is_null public

sqlx-mysql/src/raw_value.rs

@@ -55,7 +55,7 @@ impl<'r> MySqlRawValue<'r> {
         self.format
     }
 
-    /// Returns the underlying byte view of this value as a byte slice.
+    /// Returns the underlying byte view of this value.
     pub fn as_bytes(&self) -> DecodeResult<&'r [u8]> {
         self.value.map(|bytes| &**bytes).ok_or(DecodeError::UnexpectedNull)
     }

sqlx-mysql/src/row.rs

@@ -19,7 +19,7 @@ impl MySqlRow {
     }
 
     /// Returns `true` if the row contains only `NULL` values.
-    fn is_null(&self) -> bool {
+    pub fn is_null(&self) -> bool {
         self.values.iter().all(Option::is_some)
     }