MAGETWO-36045: Default weight SPIKE

MAGETWO-38817: Document default field weights

- Change default weights by spike results

Author: igrybkov

app/code/Magento/CatalogSearch/Model/Source/Weight.php

@@ -15,7 +15,7 @@ class Weight
      *
      * @var int[]
      */
-    protected $_weights = [1, 2, 3, 4, 5];
+    protected $_weights = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
 
     /**
      * Retrieve search weights as options array

app/code/Magento/CatalogSearch/Setup/InstallData.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Copyright © 2015 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\CatalogSearch\Setup;
+
+
+use Magento\Framework\DB\Adapter\AdapterInterface;
+use Magento\Framework\Setup\ModuleContextInterface;
+use Magento\Framework\Setup\ModuleDataSetupInterface;
+
+class InstallData implements \Magento\Framework\Setup\InstallDataInterface
+{
+    /**
+     * @param ModuleDataSetupInterface $setup
+     * @param ModuleContextInterface $context
+     */
+    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
+    {
+        $connection = $setup->getConnection();
+        $this->setWeight('sku', 6, $connection);
+        $this->setWeight('name', 5, $connection);
+    }
+
+
+    /**
+     * @param string $attributeCode
+     * @param int $weight
+     * @param AdapterInterface $connection
+     * @internal param $oldWeight
+     */
+    private function setWeight($attributeCode, $weight, AdapterInterface $connection)
+    {
+        $updateQuery = 'UPDATE catalog_eav_attribute SET search_weight = ?'
+            . ' WHERE attribute_id ='
+            . ' (SELECT eav_attribute.attribute_id FROM eav_attribute'
+            . ' LEFT JOIN eav_entity_type ON eav_attribute.entity_type_id = eav_entity_type.entity_type_id'
+            . ' WHERE eav_entity_type.entity_type_code = ?'
+            . ' AND eav_attribute.attribute_code = ?)';
+        $bindings = [$weight, 'catalog_product', $attributeCode];
+
+        $connection->query($updateQuery, $bindings);
+    }
+}

app/code/Magento/CatalogSearch/Setup/InstallSchema.php

@@ -90,7 +90,7 @@ public function install(SchemaSetupInterface $setup, ModuleContextInterface $con
                 'type' => \Magento\Framework\DB\Ddl\Table::TYPE_FLOAT,
                 'unsigned' => true,
                 'nullable' => false,
-                'default' => '3',
+                'default' => '1',
                 'comment' => 'Search Weight'
             ]
         );

lib/internal/Magento/Framework/Search/Adapter/Mysql/ScoreBuilder.php

@@ -79,7 +79,7 @@ public function endQuery($boost)
     public function addCondition($score)
     {
         $this->addPlus();
-        $this->scoreCondition .= "{$score} * " . self::WEIGHT_FIELD;
+        $this->scoreCondition .= "{$score} * POW(2, " . self::WEIGHT_FIELD . ')';
     }
 
     /**