From ff2564900f86c9e524526322ee17ccf69c2bd47d Mon Sep 17 00:00:00 2001
From: Sven Klemm <sven@timescale.com>
Date: Sat, 18 Aug 2018 12:34:19 +0200
Subject: [PATCH] only allow 1 filter macro in where clause

---
 public/app/plugins/datasource/postgres/query_ctrl.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/public/app/plugins/datasource/postgres/query_ctrl.ts b/public/app/plugins/datasource/postgres/query_ctrl.ts
index b459880366d..8bd61a59493 100644
--- a/public/app/plugins/datasource/postgres/query_ctrl.ts
+++ b/public/app/plugins/datasource/postgres/query_ctrl.ts
@@ -535,7 +535,13 @@ export class PostgresQueryCtrl extends QueryCtrl {
   addWhereAction(part, index) {
     switch (this.whereAdd.type) {
       case 'macro': {
-        this.whereParts.push(sqlPart.create({ type: 'macro', name: this.whereAdd.value, params: [] }));
+        let partModel = sqlPart.create({ type: 'macro', name: this.whereAdd.value, params: [] });
+        if (this.whereParts.length >= 1 && this.whereParts[0].def.type === 'macro') {
+          // replace current macro
+          this.whereParts[0] = partModel;
+        } else {
+          this.whereParts.splice(0, 0, partModel);
+        }
         break;
       }
       default: {