From b0a5c51b959d5849377354563405a88a770e1f33 Mon Sep 17 00:00:00 2001
From: Mark Nevill <mark.nevill@gmail.com>
Date: Mon, 9 Dec 2019 10:32:40 +0000
Subject: [PATCH] Return unused point slice to pool in Call and VectorSelector
 eval. (#6427)

Signed-off-by: Mark Nevill <mark.nevill@gmail.com>
---
 promql/engine.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/promql/engine.go b/promql/engine.go
index d64118613..adc0954b1 100644
--- a/promql/engine.go
+++ b/promql/engine.go
@@ -1070,6 +1070,8 @@ func (ev *evaluator) eval(expr Expr) Value {
 				} else {
 					ev.error(ErrTooManySamples(env))
 				}
+			} else {
+				putPointSlice(ss.Points)
 			}
 		}
 		if mat.ContainsSameLabelset() {
@@ -1165,6 +1167,8 @@ func (ev *evaluator) eval(expr Expr) Value {
 
 			if len(ss.Points) > 0 {
 				mat = append(mat, ss)
+			} else {
+				putPointSlice(ss.Points)
 			}
 
 		}