From bcdaf8e2d23fdd8dbabc1b118c0ce3b698c8bae3 Mon Sep 17 00:00:00 2001
From: Tony Lee <github@roganartu.com>
Date: Wed, 18 Jul 2018 00:29:21 -0400
Subject: [PATCH] add unused pointslices to the pool (#4363)

Signed-off-by: Tony Lee <tl@hudson-trading.com>
---
 promql/engine.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/promql/engine.go b/promql/engine.go
index ca879ca51..d20292134 100644
--- a/promql/engine.go
+++ b/promql/engine.go
@@ -1060,6 +1060,8 @@ func (ev *evaluator) matrixSelector(node *MatrixSelector) Matrix {
 
 		if len(ss.Points) > 0 {
 			matrix = append(matrix, ss)
+		} else {
+			putPointSlice(ss.Points)
 		}
 	}
 	return matrix