From 762c96785597381a3eb7154205e10779f02f5903 Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Mon, 12 Oct 2020 11:45:44 +0300
Subject: [PATCH] app/vmselect/promql: keep metric name after applying more
 functions, which dont change time series meaning

Functions are:

* keep_last_value
* keep_next_value
* interpolate
* running_min
* running_max
* running_avg
* range_min
* range_max
* range_avg
* range_first
* range_last
* range_quantile
* smooth_exponential

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/674
---
 app/vmselect/promql/transform.go | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/app/vmselect/promql/transform.go b/app/vmselect/promql/transform.go
index da0e66e733..bc39a112f0 100644
--- a/app/vmselect/promql/transform.go
+++ b/app/vmselect/promql/transform.go
@@ -18,11 +18,24 @@ import (
 )
 
 var transformFuncsKeepMetricGroup = map[string]bool{
-	"ceil":      true,
-	"clamp_max": true,
-	"clamp_min": true,
-	"floor":     true,
-	"round":     true,
+	"ceil":               true,
+	"clamp_max":          true,
+	"clamp_min":          true,
+	"floor":              true,
+	"round":              true,
+	"keep_last_value":    true,
+	"keep_next_value":    true,
+	"interpolate":        true,
+	"running_min":        true,
+	"running_max":        true,
+	"running_avg":        true,
+	"range_min":          true,
+	"range_max":          true,
+	"range_avg":          true,
+	"range_first":        true,
+	"range_last":         true,
+	"range_quantile":     true,
+	"smooth_exponential": true,
 }
 
 var transformFuncs = map[string]transformFunc{