better comment

dolthub · Jul 26, 2024 · a3c3bd8 · a3c3bd8
1 parent 4f71536
commit a3c3bd8
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/sql/memo/rel_props.go b/sql/memo/rel_props.go
@@ -496,6 +496,8 @@ func getJoinStats(leftIdx, rightIdx, leftChild, rightChild sql.Statistic, prefix
 		if expandRatio == 1 {
 			return leftIdx, nil
 		} else {
+			// ths undershoots the estimate, but is directionally correct and faster
+			// than squaring every bucket
 			return leftIdx.WithRowCount(leftIdx.RowCount() * expandRatio), nil
 		}
 	}