message: forgot to destroy the appender
diff: @@ -48,6 +48,9 @@ void TestAppendingSingleDecimalValue(TYPE value, duckdb_decimal expected, uint8_
  result = tester.Query("SELECT * FROM decimals");
  AssertDecimalValueMatches(result, expected);
  +
  + duckdb_appender_close(appender);
  + duckdb_appender_destroy(&appender);
  }
  TEST_CASE("Test appending into DECIMAL in C API", "[capi]") {
  