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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\DB\QueryBuilder\Sharded;
/**
* Queries on sharded table has the following limitations:
*
* 1. Either the shard key (e.g. "storage") or primary key (e.g. "fileid") must be mentioned in the query.
* Or the query must be explicitly marked as running across all shards.
*
* For queries where it isn't possible to set one of these keys in the query normally, you can set it using `hintShardKey`
*
* 2. Insert statements must always explicitly set the shard key
* 3. A query on a sharded table is not allowed to join on the same table
* 4. Right joins are not allowed on sharded tables
* 5. Updating the shard key where the new shard key maps to a different shard is not allowed
*
* Moving rows to a different shard needs to be implemented manually. `CrossShardMoveHelper` provides
* some tools to help make this easier.
*/
class InvalidShardedQueryException extends \Exception {
}
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