From e1aa0bc7ae302ea16d6766988b3d929ed85c1ab3 Mon Sep 17 00:00:00 2001
From: Javier Goizueta <jgoizueta@gmail.com>
Date: Wed, 18 May 2016 13:09:55 +0200
Subject: [PATCH] Use JSON format for EXPLAIN

---
 lib/cartodb/api/filter_stats_api.js | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/lib/cartodb/api/filter_stats_api.js b/lib/cartodb/api/filter_stats_api.js
index 5196d2fa..d872ad8c 100644
--- a/lib/cartodb/api/filter_stats_api.js
+++ b/lib/cartodb/api/filter_stats_api.js
@@ -9,19 +9,15 @@ function FilterStatsApi(pgQueryRunner) {
 module.exports = FilterStatsApi;
 
 function getEstimatedRows(pgQueryRunner, username, query, callback) {
-    pgQueryRunner.run(username, "EXPLAIN "+query, function(err, result_rows) {
+    pgQueryRunner.run(username, "EXPLAIN (FORMAT JSON)"+query, function(err, result_rows) {
         if (err){
             callback(err);
             return;
         }
         var rows;
-        var query_plan = result_rows[0]['QUERY PLAN'];
-        var match;
-        if ( query_plan ) {
-            match = query_plan.match(/rows=(\d+)/);
-        }
-        if ( match ) {
-          rows = +match[1];
+        if ( result_rows[0] && result_rows[0]['QUERY PLAN'] &&
+             result_rows[0]['QUERY PLAN'][0] && result_rows[0]['QUERY PLAN'][0].Plan ) {
+            rows = result_rows[0]['QUERY PLAN'][0].Plan['Plan Rows'];
         }
         return callback(null, rows);
     });