alamb commented on a change in pull request #1622:
URL: https://github.com/apache/arrow-datafusion/pull/1622#discussion_r790021489



##########
File path: datafusion/src/datasource/file_format/parquet.rs
##########
@@ -367,13 +366,28 @@ mod tests {
     };
 
     use super::*;
+    use crate::datasource::listing::ListingOptions;
     use crate::execution::runtime_env::{RuntimeConfig, RuntimeEnv};
     use arrow::array::{
         BinaryArray, BooleanArray, Float32Array, Float64Array, Int32Array,
         TimestampNanosecondArray,
     };
     use futures::StreamExt;
 
+    #[tokio::test]
+    async fn test_merge_schema() -> Result<()> {

Review comment:
       I think coverage at the `ParquetExec` level is more than adequate. 




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