Avoid ambigous TABLE_NAME in query (#6275)

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|      Q       |   A
|------------- | -----------
| Type         | bug
| Fixed issues | #6274 

#### Summary

The current produced query leads to an ambigous column reference as
described in the linked issue.

src/Platforms/MariaDb1043Platform.php

@@ -92,17 +92,19 @@ public function getColumnTypeSQLSnippet(string $tableAlias = 'c', ?string $datab
             );
         }
 
+        $subQueryAlias = 'i_' . $tableAlias;
+
         $databaseName = $this->getDatabaseNameSQL($databaseName);
 
         // The check for `CONSTRAINT_SCHEMA = $databaseName` is mandatory here to prevent performance issues
         return <<<SQL
             IF(
                 $tableAlias.COLUMN_TYPE = 'longtext'
                 AND EXISTS(
-                    SELECT * from information_schema.CHECK_CONSTRAINTS 
-                    WHERE CONSTRAINT_SCHEMA = $databaseName
-                    AND TABLE_NAME = $tableAlias.TABLE_NAME
-                    AND CHECK_CLAUSE = CONCAT(
+                    SELECT * from information_schema.CHECK_CONSTRAINTS $subQueryAlias
+                    WHERE $subQueryAlias.CONSTRAINT_SCHEMA = $databaseName
+                    AND $subQueryAlias.TABLE_NAME = $tableAlias.TABLE_NAME
+                    AND $subQueryAlias.CHECK_CLAUSE = CONCAT(
                         'json_valid(`',
                             $tableAlias.COLUMN_NAME,
                         '`)'