Trim trailing zeros and '.' (dot) for float numbers when generating CSV

pq2json/src/converter.rs

@@ -194,7 +194,7 @@ fn value_to_csv(value: &Value) -> String {
         Value::Number(ref v) => {
             if v.is_f64() {
                 let mut buffer = ryu::Buffer::new();
-                buffer.format(v.as_f64().unwrap()).to_owned()
+                truncate_trailing_zeros(buffer.format(v.as_f64().unwrap())).to_string()
             } else if v.is_u64() {
                 format!("{}", v.as_u64().unwrap())
             } else {
@@ -207,6 +207,10 @@ fn value_to_csv(value: &Value) -> String {
     }
 }
 
+fn truncate_trailing_zeros(str: &str) -> &str {
+    str.trim_end_matches('0').trim_end_matches('.')
+}
+
 fn row_to_value(settings: &Settings, row: &Row) -> Result<Value, Box<dyn Error>> {
     let mut map = serde_json::Map::with_capacity(row.len());
     for i in 0..row.len() {