Fix deserializing SQL array with only one element

src/graphql.rs

@@ -74,9 +74,6 @@ where
     <T as FromStr>::Err: Into<Box<dyn std::error::Error + Send + Sync>>,
 {
     let mut raw_values: Vec<_> = raw.split(',').collect();
-    if raw_values[0] == raw {
-        raw_values.clear();
-    }
     let mut values = Vec::new();
     for r in raw_values.drain(..) {
         values.push(r.parse().map_err(into_column_decode_err(index))?);