Add plan assertions to tpch tests

Author: gabotechs

src/test_utils/tpch.rs

@@ -160,14 +160,14 @@ where
 
 macro_rules! must_generate_tpch_table {
     ($generator:ident, $arrow:ident, $name:literal, $data_dir:expr) => {
-        let data_dir = $data_dir.join(format!("{}.parquet", $name));
+        let data_dir = $data_dir.join($name);
         fs::create_dir_all(data_dir.clone()).expect("Failed to create data directory");
         // create three partitions for the table
         (1..=3).for_each(|part| {
             generate_table(
                 // TODO: Consider adjusting the partitions and batch sizes.
                 $arrow::new($generator::new(SCALE_FACTOR, part, 3)).with_batch_size(1000),
-                &format!("{}.parquet", part),
+                &format!("{part}"),
                 &data_dir.clone().into_boxed_path(),
             )
             .expect(concat!("Failed to generate ", $name, " table"));