fix(sql): decode float columns as f32, closes #602 (#607)

plugins/sql/src/decode/mysql.rs

@@ -17,7 +17,14 @@ pub(crate) fn to_json(v: MySqlValueRef) -> Result<JsonValue, Error> {
                 JsonValue::Null
             }
         }
-        "FLOAT" | "DOUBLE" => {
+        "FLOAT" => {
+            if let Ok(v) = ValueRef::to_owned(&v).try_decode::<f32>() {
+                JsonValue::from(v)
+            } else {
+                JsonValue::Null
+            }
+        }
+        "DOUBLE" => {
             if let Ok(v) = ValueRef::to_owned(&v).try_decode::<f64>() {
                 JsonValue::from(v)
             } else {