ENGCOM-7622: Rewrote Magento\Framework\DB\Adapter\Pdo\Mysql->isTableExists #28516

Author: gabrieldagama

dev/tests/integration/testsuite/Magento/MediaStorage/Console/Command/ImageResizeCommandTest.php

@@ -116,6 +116,7 @@ public function testExecuteWithZeroByteImage()
      *
      * @magentoDataFixture Magento/MediaStorage/_files/database_mode.php
      * @magentoDataFixture Magento/MediaStorage/_files/product_with_missed_image.php
+     * @magentoDbIsolation disabled
      */
     public function testDatabaseStorageMissingFile()
     {

dev/tests/integration/testsuite/Magento/MediaStorage/Helper/File/Storage/DatabaseTest.php

@@ -52,7 +52,7 @@ protected function setUp(): void
     /**
      * test for \Magento\MediaStorage\Model\File\Storage\Database::deleteFolder()
      *
-     * @magentoDbIsolation enabled
+     * @magentoDbIsolation disabled
      * @magentoDataFixture Magento/MediaStorage/_files/database_mode.php
      * @magentoConfigFixture current_store system/media_storage_configuration/media_storage 1
      * @magentoConfigFixture current_store system/media_storage_configuration/media_database default_setup

lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php

@@ -48,30 +48,31 @@ class Mysql extends \Zend_Db_Adapter_Pdo_Mysql implements AdapterInterface
 {
     // @codingStandardsIgnoreEnd
 
-    const TIMESTAMP_FORMAT      = 'Y-m-d H:i:s';
-    const DATETIME_FORMAT       = 'Y-m-d H:i:s';
-    const DATE_FORMAT           = 'Y-m-d';
+    public const TIMESTAMP_FORMAT      = 'Y-m-d H:i:s';
+    public const DATETIME_FORMAT       = 'Y-m-d H:i:s';
+    public const DATE_FORMAT           = 'Y-m-d';
 
-    const DDL_DESCRIBE          = 1;
-    const DDL_CREATE            = 2;
-    const DDL_INDEX             = 3;
-    const DDL_FOREIGN_KEY       = 4;
-    const DDL_CACHE_PREFIX      = 'DB_PDO_MYSQL_DDL';
-    const DDL_CACHE_TAG         = 'DB_PDO_MYSQL_DDL';
+    public const DDL_DESCRIBE          = 1;
+    public const DDL_CREATE            = 2;
+    public const DDL_INDEX             = 3;
+    public const DDL_FOREIGN_KEY       = 4;
+    public const DDL_EXISTS            = 5;
+    public const DDL_CACHE_PREFIX      = 'DB_PDO_MYSQL_DDL';
+    public const DDL_CACHE_TAG         = 'DB_PDO_MYSQL_DDL';
 
-    const LENGTH_TABLE_NAME     = 64;
-    const LENGTH_INDEX_NAME     = 64;
-    const LENGTH_FOREIGN_NAME   = 64;
+    public const LENGTH_TABLE_NAME     = 64;
+    public const LENGTH_INDEX_NAME     = 64;
+    public const LENGTH_FOREIGN_NAME   = 64;
 
     /**
      * MEMORY engine type for MySQL tables
      */
-    const ENGINE_MEMORY = 'MEMORY';
+    public const ENGINE_MEMORY = 'MEMORY';
 
     /**
      * Maximum number of connection retries
      */
-    const MAX_CONNECTION_RETRIES = 10;
+    public const MAX_CONNECTION_RETRIES = 10;
 
     /**
      * Default class name for a DB statement.
@@ -1631,7 +1632,13 @@ public function resetDdlCache($tableName = null, $schemaName = null)
         } else {
             $cacheKey = $this->_getTableName($tableName, $schemaName);
 
-            $ddlTypes = [self::DDL_DESCRIBE, self::DDL_CREATE, self::DDL_INDEX, self::DDL_FOREIGN_KEY];
+            $ddlTypes = [
+                self::DDL_DESCRIBE,
+                self::DDL_CREATE,
+                self::DDL_INDEX,
+                self::DDL_FOREIGN_KEY,
+                self::DDL_EXISTS
+            ];
             foreach ($ddlTypes as $ddlType) {
                 unset($this->_ddlCache[$ddlType][$cacheKey]);
             }
@@ -2658,7 +2665,30 @@ public function truncateTable($tableName, $schemaName = null)
      */
     public function isTableExists($tableName, $schemaName = null)
     {
-        return $this->showTableStatus($tableName, $schemaName) !== false;
+        $cacheKey = $this->_getTableName($tableName, $schemaName);
+
+        $ddl = $this->loadDdlCache($cacheKey, self::DDL_EXISTS);
+        if ($ddl !== false) {
+            return true;
+        }
+
+        $fromDbName = 'DATABASE()';
+        if ($schemaName !== null) {
+            $fromDbName = $this->quote($schemaName);
+        }
+
+        $sql = sprintf(
+            'SELECT COUNT(1) AS tbl_exists FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = %s AND TABLE_SCHEMA = %s',
+            $this->quote($tableName),
+            $fromDbName
+        );
+        $ddl = $this->rawFetchRow($sql, 'tbl_exists');
+        if ($ddl) {
+            $this->saveDdlCache($cacheKey, self::DDL_EXISTS, $ddl);
+            return true;
+        }
+
+        return false;
     }
 
     /**