tec: Add a GIN index on links.tags

src/migrations/Migration202410310001ChangeLinksTagsFromJsonToJsonb.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\migrations;
+
+class Migration202410310001ChangeLinksTagsFromJsonToJsonb
+{
+    public function migrate(): bool
+    {
+        $database = \Minz\Database::get();
+
+        $database->exec(<<<'SQL'
+            ALTER TABLE links
+            ALTER COLUMN tags
+            SET DATA TYPE JSONB
+            USING tags::jsonb;
+
+            CREATE INDEX idx_links_tags ON links USING GIN (tags);
+        SQL);
+
+        return true;
+    }
+
+    public function rollback(): bool
+    {
+        $database = \Minz\Database::get();
+
+        $database->exec(<<<'SQL'
+            DROP INDEX idx_links_tags;
+
+            ALTER TABLE links
+            ALTER COLUMN tags
+            SET DATA TYPE JSON
+            USING tags::json;
+        SQL);
+
+        return true;
+    }
+}

src/schema.sql

@@ -147,7 +147,7 @@ CREATE TABLE links (
     url_replies TEXT NOT NULL DEFAULT '',
     reading_time INTEGER NOT NULL DEFAULT 0,
     image_filename TEXT,
-    tags JSON NOT NULL DEFAULT '[]',
+    tags JSONB NOT NULL DEFAULT '[]',
 
     to_be_fetched BOOLEAN NOT NULL DEFAULT true,
     fetched_at TIMESTAMPTZ,
@@ -173,6 +173,7 @@ CREATE INDEX idx_links_url ON links USING gin (url gin_trgm_ops);
 CREATE INDEX idx_links_to_be_fetched ON links(to_be_fetched) WHERE to_be_fetched = true;
 CREATE INDEX idx_links_image_filename ON links(image_filename) WHERE image_filename IS NOT NULL;
 CREATE INDEX idx_links_search ON links USING GIN (search_index);
+CREATE INDEX idx_links_tags ON links USING GIN (tags);
 
 CREATE TABLE links_to_collections (
     id BIGSERIAL PRIMARY KEY,

src/search_engine/LinksSearcher.php

@@ -191,12 +191,12 @@ private static function buildWhereQuery(Query $query): array
 
         if ($tags_parameters) {
             $tags_statement = implode(',', $tags_parameters);
-            $where_sql .= " AND l.tags::jsonb ??& array[{$tags_statement}]";
+            $where_sql .= " AND l.tags ??& array[{$tags_statement}]";
         }
 
         if ($not_tags_parameters) {
             $not_tags_statement = implode(',', $not_tags_parameters);
-            $where_sql .= " AND NOT (l.tags::jsonb ??| array[{$not_tags_statement}])";
+            $where_sql .= " AND NOT (l.tags ??| array[{$not_tags_statement}])";
         }
 
         return [$where_sql, $parameters];