From af52df2d968da63ce57452b2ae935630cbc0c02f Mon Sep 17 00:00:00 2001
From: Guo Xiang Tan <gxtan1990@gmail.com>
Date: Thu, 2 Jul 2020 14:11:18 +0800
Subject: [PATCH] DEV: Add hidden site setting for PG search ranking
 normalization.

---
 config/site_settings.yml | 3 +++
 lib/search.rb            | 4 +---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/config/site_settings.yml b/config/site_settings.yml
index 557d7bdf81d..1c28fe7c9ca 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -1730,6 +1730,9 @@ backups:
     hidden: true
 
 search:
+  search_ranking_normalization:
+    default: '1'
+    hidden: true
   search_inject_extra_terms:
     default: true
     hidden: true
diff --git a/lib/search.rb b/lib/search.rb
index 9b593d8d155..aef17c46107 100644
--- a/lib/search.rb
+++ b/lib/search.rb
@@ -937,14 +937,12 @@ class Search
         posts = posts.order("posts.like_count DESC")
       end
     else
-      # 1|32 divides the rank by 1 + logarithm of the document length and
-      # scales the range from zero to one
       data_ranking = <<~SQL
       (
         TS_RANK_CD(
           post_search_data.search_data,
           #{ts_query(weight_filter: weights)},
-          1|32
+          #{Sitesetting.search_ranking_normalization}|32
         ) *
         (
           CASE categories.search_priority