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apache · Sep 25, 2024 · fee8bdf · fee8bdf
1 parent c4e7e2f
commit fee8bdf
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/datafusion/physical-plan/src/aggregates/mod.rs b/datafusion/physical-plan/src/aggregates/mod.rs
@@ -261,6 +261,9 @@ impl PhysicalGroupBy {
     }
 
     /// Returns the data type of the grouping id.
+    /// The grouping ID value is a bitmask where each set bit
+    /// indicates that the corresponding grouping expression is
+    /// null
     fn grouping_id_type(&self) -> DataType {
         if self.expr.len() <= 8 {
             DataType::UInt8