From 06675c2f9c902e2b0c13e8ffb85acb9b054708ba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kuba=20Podg=C3=B3rski?= <kuba--@users.noreply.github.com>
Date: Mon, 27 Apr 2020 12:43:15 +0200
Subject: [PATCH] GroupBy should terminate even if the last result is empty

---
 executor.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/executor.go b/executor.go
index 1b466b1b6..1e030b828 100644
--- a/executor.go
+++ b/executor.go
@@ -3178,6 +3178,9 @@ func (gbi *groupByIterator) nextAtIdx(i int) {
 		}
 		if wrapped && i != 0 {
 			gbi.nextAtIdx(i - 1)
+			if gbi.done {
+				return
+			}
 		}
 		if i == 0 && gbi.filter != nil {
 			gbi.rows[i].row = nr.Intersect(gbi.filter)