TYPO3 / TYPO3.CMS

                // Treat each renamed index with a new diff to get a dedicated suggestions

                // just for this index.

                foreach ($changedTable->renamedIndexes as $key => $renamedIndex) {

                    $indexDiff = clone $tableDiff;

                    $indexDiff->renamedIndexes = [$key => $renamedIndex];

                    $temporarySchemaDiff = GeneralUtility::makeInstance(

                        SchemaDiff::class,

                        [],

                        [$indexDiff],

                        [],

                        $schemaDiff->fromSchema

                    );

                    $statements = $temporarySchemaDiff->toSql($databasePlatform);

                    foreach ($statements as $statement) {

                        $updateSuggestions['change'][md5($statement)] = $statement;

                    }

                }

            }

            // Treat each changed foreign key with a new diff to get a dedicated suggestions

                    $schemaDiff->fromSchema->getTable($changedTable->name)

                );

                foreach ($changedTable->changedForeignKeys as $changedForeignKey) {

                    $foreignKeyDiff = clone $tableDiff;

                    $foreignKeyDiff->changedForeignKeys = [$this->buildQuotedForeignKey($changedForeignKey)];

                    $temporarySchemaDiff = GeneralUtility::makeInstance(

                        SchemaDiff::class,

                        [],

                        [$foreignKeyDiff],

                        [],

                        $schemaDiff->fromSchema

                    );

                    $statements = $temporarySchemaDiff->toSql($databasePlatform);

                    foreach ($statements as $statement) {

                        $updateSuggestions['change'][md5($statement)] = $statement;

                    }

                }

            }

        }