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PhabricatorSearchNgramsDestructionEngineExtension.php
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			<?php

			final class PhabricatorSearchNgramsDestructionEngineExtension
			extends PhabricatorDestructionEngineExtension {

			const EXTENSIONKEY = 'search.ngrams';

			public function getExtensionName() {
			return pht('Search Ngram');
			}

			public function canDestroyObject(
			PhabricatorDestructionEngine $engine,
			$object) {
			return ($object instanceof PhabricatorNgramsInterface);
			}

			public function destroyObject(
			PhabricatorDestructionEngine $engine,
			$object) {

			foreach ($object->newNgrams() as $ngram) {
			queryfx(
			$ngram->establishConnection('w'),
			'DELETE FROM %T WHERE objectID = %d',
			$ngram->getTableName(),
			$object->getID());
			}
			}

			}