Update datafusion/physical-plan/src/memory.rs

Co-authored-by: Jay Zhan <[email protected]>
apache · Jan 8, 2025 · dc1952a · dc1952a
1 parent 388bc5d
commit dc1952a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/datafusion/physical-plan/src/memory.rs b/datafusion/physical-plan/src/memory.rs
@@ -189,6 +189,8 @@ impl MemoryExec {
         let n_row = data.len();
         let n_col = schema.fields().len();
 
+        // We have this single row batch as a placeholder to satisfy evaluation argument
+        // and generate a single output row
         let placeholder_schema = Arc::new(Schema::empty());
         let placeholder_batch = RecordBatch::try_new_with_options(
             Arc::clone(&placeholder_schema),