Use correct SemVer range condition. Fixes #38 (#39)

postgres_exporter.go

@@ -2,25 +2,24 @@ package main
 
 import (
 	"database/sql"
+	"errors"
 	"flag"
 	"fmt"
 	"io/ioutil"
 	"math"
 	"net/http"
 	"os"
-	"strconv"
-	"time"
 	"regexp"
-	"errors"
+	"strconv"
 	"sync"
+	"time"
 
 	"gopkg.in/yaml.v2"
 
+	"github.com/blang/semver"
 	_ "github.com/lib/pq"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/log"
-	"github.com/blang/semver"
-
 )
 
 var Version string = "0.0.1"
@@ -358,7 +357,6 @@ var queryOverrides = map[string][]OverrideQuery{
 		},
 		// No query is applicable for 9.1 that gives any sensible data.
 	},
-
 }
 
 // Convert the query override file to the version-specific query override file
@@ -509,7 +507,7 @@ func makeDescMap(pgVersion semver.Version, metricMaps map[string]map[string]Colu
 			// Check column version compatibility for the current map
 			// Force to discard if not compatible.
 			if columnMapping.supportedVersions != nil {
-				if columnMapping.supportedVersions(pgVersion) {
+				if !columnMapping.supportedVersions(pgVersion) {
 					thisMap[columnName] = MetricMap{
 						discard: true,
 						conversion: func(in interface{}) (float64, bool) {
@@ -948,7 +946,7 @@ func (e *Exporter) checkMapVersions(ch chan<- prometheus.Metric, db *sql.DB) err
 		e.lastMapVersion = semanticVersion
 
 		if e.userQueriesPath != "" {
-			if err := addQueries(e.userQueriesPath, semanticVersion, e.metricMap, e.queryOverrides) ; err != nil {
+			if err := addQueries(e.userQueriesPath, semanticVersion, e.metricMap, e.queryOverrides); err != nil {
 				log.Errorln("Failed to reload user queries:", e.userQueriesPath, err)
 			}
 		}