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25 changes: 25 additions & 0 deletions
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fe/fe-core/src/main/java/org/apache/doris/datasource/mvcc/MvccSnapshot.java
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// Licensed to the Apache Software Foundation (ASF) under one | ||
// or more contributor license agreements. See the NOTICE file | ||
// distributed with this work for additional information | ||
// regarding copyright ownership. The ASF licenses this file | ||
// to you under the Apache License, Version 2.0 (the | ||
// "License"); you may not use this file except in compliance | ||
// with the License. You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, | ||
// software distributed under the License is distributed on an | ||
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
// KIND, either express or implied. See the License for the | ||
// specific language governing permissions and limitations | ||
// under the License. | ||
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package org.apache.doris.datasource.mvcc; | ||
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/** | ||
* The snapshot information of mvcc is defined by each table, | ||
* but it should be ensured that the table information queried through this snapshot remains unchanged | ||
*/ | ||
public interface MvccSnapshot { | ||
} |
33 changes: 33 additions & 0 deletions
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fe/fe-core/src/main/java/org/apache/doris/datasource/mvcc/MvccTable.java
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// Licensed to the Apache Software Foundation (ASF) under one | ||
// or more contributor license agreements. See the NOTICE file | ||
// distributed with this work for additional information | ||
// regarding copyright ownership. The ASF licenses this file | ||
// to you under the Apache License, Version 2.0 (the | ||
// "License"); you may not use this file except in compliance | ||
// with the License. You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, | ||
// software distributed under the License is distributed on an | ||
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
// KIND, either express or implied. See the License for the | ||
// specific language governing permissions and limitations | ||
// under the License. | ||
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package org.apache.doris.datasource.mvcc; | ||
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import org.apache.doris.catalog.TableIf; | ||
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/** | ||
* The table that needs to query data based on the version needs to implement this interface. | ||
*/ | ||
public interface MvccTable extends TableIf { | ||
/** | ||
* Retrieve the current snapshot information of the table, | ||
* and the returned result will be used for the entire process of this query | ||
* | ||
* @return MvccSnapshot | ||
*/ | ||
MvccSnapshot loadSnapshot(); | ||
} |
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