20180828.phriction.06.c.documentid.php
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	<?php

	// See T13193. We're about to drop the "documentID" column, which is part of
	// a UNIQUE KEY. In MariaDB, we must first drop the "documentID" key or we get
	// into deep trouble.

	// There's no "IF EXISTS" modifier for "ALTER TABLE" so run this as a PHP patch
	// instead of an SQL patch.

	$table = new PhrictionContent();
	$conn = $table->establishConnection('w');

	try {
	queryfx(
	$conn,
	'ALTER TABLE %T DROP KEY documentID',
	$table->getTableName());
	} catch (AphrontQueryException $ex) {
	// Ignore.
	}