Migrations\Shell\Task\MigrationDiffTask::getIndexes PHP Method

    protected function getIndexes()
    {
        foreach ($this->commonTables as $table => $currentSchema) {
            $currentIndexes = $currentSchema->indexes();
            $oldIndexes = $this->dumpSchema[$table]->indexes();
            sort($currentIndexes);
            sort($oldIndexes);
            // brand new indexes
            $addedIndexes = array_diff($currentIndexes, $oldIndexes);
            foreach ($addedIndexes as $indexName) {
                $this->templateData[$table]['indexes']['add'][$indexName] = $currentSchema->index($indexName);
            }
            // indexes having the same name between new and old schema
            // if present in both, check if they are the same : if not, remove the old one and add the new one
            foreach ($currentIndexes as $indexName) {
                $index = $currentSchema->index($indexName);
                if (in_array($indexName, $oldIndexes) && $index !== $this->dumpSchema[$table]->index($indexName)) {
                    $this->templateData[$table]['indexes']['remove'][$indexName] = $this->dumpSchema[$table]->index($indexName);
                    $this->templateData[$table]['indexes']['add'][$indexName] = $index;
                }
            }
            // indexes deletion
            if (!isset($this->templateData[$table]['indexes']['remove'])) {
                $this->templateData[$table]['indexes']['remove'] = [];
            }
            $removedIndexes = array_diff($oldIndexes, $currentIndexes);
            $parts = [];
            if (!empty($removedIndexes)) {
                foreach ($removedIndexes as $index) {
                    $parts[$index] = $this->dumpSchema[$table]->index($index);
                }
            }
            $this->templateData[$table]['indexes']['remove'] = array_merge($this->templateData[$table]['indexes']['remove'], $parts);
        }
    }