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PhabricatorSearchFerretNgramGarbageCollector.php
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			<?php

			final class PhabricatorSearchFerretNgramGarbageCollector
			extends PhabricatorGarbageCollector {

			const COLLECTORCONST = 'search.ferret.ngram';

			public function getCollectorName() {
			return pht('Ferret Engine Ngrams');
			}

			public function hasAutomaticPolicy() {
			return true;
			}

			protected function collectGarbage() {
			$all_objects = id(new PhutilClassMapQuery())
			->setAncestorClass('PhabricatorFerretInterface')
			->execute();

			$did_collect = false;
			foreach ($all_objects as $object) {
			$engine = $object->newFerretEngine();
			$conn = $object->establishConnection('w');

			$ngram_row = queryfx_one(
			$conn,
			'SELECT ngram FROM %T WHERE needsCollection = 1 LIMIT 1',
			$engine->getCommonNgramsTableName());
			if (!$ngram_row) {
			continue;
			}

			$ngram = $ngram_row['ngram'];

			queryfx(
			$conn,
			'DELETE FROM %T WHERE ngram = %s',
			$engine->getNgramsTableName(),
			$ngram);

			queryfx(
			$conn,
			'UPDATE %T SET needsCollection = 0 WHERE ngram = %s',
			$engine->getCommonNgramsTableName(),
			$ngram);

			$did_collect = true;
			break;
			}

			return $did_collect;
			}

			}