org.apache.hadoop.hive.ql.ddl.table.constraint.drop.AlterTableDropConstraintOperation Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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,
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package org.apache.hadoop.hive.ql.ddl.table.constraint.drop;
import org.apache.hadoop.hive.metastore.api.NoSuchObjectException;
import org.apache.hadoop.hive.ql.ddl.DDLOperation;
import org.apache.hadoop.hive.ql.ddl.DDLOperationContext;
import org.apache.hadoop.hive.ql.ddl.DDLUtils;
import org.apache.hadoop.hive.ql.metadata.HiveException;
/**
* Operation process of dropping a new constraint.
*/
public class AlterTableDropConstraintOperation extends DDLOperation {
public AlterTableDropConstraintOperation(DDLOperationContext context, AlterTableDropConstraintDesc desc) {
super(context, desc);
}
@Override
public int execute() throws Exception {
if (!DDLUtils.allowOperationInReplicationScope(context.getDb(), desc.getDbTableName(), null,
desc.getReplicationSpec())) {
// no alter, the table is missing either due to drop/rename which follows the alter.
// or the existing table is newer than our update.
LOG.debug("DDLTask: Alter Table is skipped as table {} is newer than update", desc.getDbTableName());
return 0;
}
try {
context.getDb().dropConstraint(desc.getTableName().getDb(), desc.getTableName().getTable(),
desc.getConstraintName());
} catch (NoSuchObjectException e) {
throw new HiveException(e);
}
return 0;
}
}