code: private function getSqlDefinitions(): array
      {
          $this->framework->initialize();
  
          /** @var Installer $installer */
          $installer = $this->framework->createInstance(Installer::class);
          $sqlTarget = $installer->getFromDca();
          $sqlLegacy = $installer->getFromFile();
  
          // Manually merge the legacy definitions (see #4766)
          if (!empty($sqlLegacy)) {
              foreach ($sqlLegacy as $table => $categories) {
                  foreach ($categories as $category => $fields) {
                      if (\is_array($fields)) {
                          foreach ($fields as $name => $sql) {
                              $sqlTarget[$table][$category][$name] = $sql;
                          }
                      } else {
                          $sqlTarget[$table][$category] = $fields;
                      }
                  }
              }
          }
  
          // Apply the schema filter (see contao/installation-bundle#78)
          if ($filter = $this->doctrine->getConnection()->getConfiguration()->getFilterSchemaAssetsExpression()) {
              foreach (array_keys($sqlTarget) as $key) {
                  if (!preg_match($filter, $key)) {
                      unset($sqlTarget[$key]);
                  }
              }
          }
  
          return $sqlTarget;
      }
docs: Returns the SQL definitions from the Contao installer.
  
  @return array<string,array<string,string[]>>