Explicitly drop parser in order to free memory

Author: curtisalexander

readstat/src/rs_data.rs

@@ -160,12 +160,16 @@ impl ReadStatData {
 
         // setup parser
         // once call parse_sas7bdat, iteration begins
-        let error = ReadStatParser::new()
+        let mut parser = ReadStatParser::new()
             // do not set metadata handler nor variable handler as already processed
             .set_value_handler(Some(cb::handle_value))?
             .set_row_limit(Some(self.batch_rows_to_process.try_into().unwrap()))?
-            .set_row_offset(Some(self.batch_row_start.try_into().unwrap()))?
-            .parse_sas7bdat(ppath, ctx);
+            .set_row_offset(Some(self.batch_row_start.try_into().unwrap()))?;
+
+        let error = parser.parse_sas7bdat(ppath, ctx);
+
+        // drop parser after finished
+        drop(parser);
 
         match FromPrimitive::from_i32(error as i32) {
             Some(ReadStatError::READSTAT_OK) => Ok(()),

readstat/src/rs_parser.rs

@@ -133,7 +133,7 @@ impl ReadStatParser {
     }
 
     pub fn parse_sas7bdat(
-        self,
+        &mut self,
         path: *const c_char,
         user_ctx: *mut c_void,
     ) -> readstat_sys::readstat_error_t {