org.apache.hadoop.hive.ql.ddl.table.column.update.AlterTableUpdateColumnsOperation Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hive.ql.ddl.table.column.update;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.hive.metastore.HiveMetaStoreUtils;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.StorageDescriptor;
import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
import org.apache.hadoop.hive.ql.ErrorMsg;
import org.apache.hadoop.hive.ql.ddl.DDLOperationContext;
import org.apache.hadoop.hive.ql.ddl.table.AbstractAlterTableOperation;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.metadata.Partition;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.serde2.Deserializer;
/**
* Operation process of adding some new columns.
*/
public class AlterTableUpdateColumnsOperation extends AbstractAlterTableOperation {
public AlterTableUpdateColumnsOperation(DDLOperationContext context, AlterTableUpdateColumnsDesc desc) {
super(context, desc);
}
@Override
protected void doAlteration(Table table, Partition partition) throws HiveException {
//StorageDescriptor sd = getStorageDescriptor(table, partition);
String serializationLib = table.getSd().getSerdeInfo().getSerializationLib();
Collection serdes = MetastoreConf.getStringCollection(context.getConf(),
MetastoreConf.ConfVars.SERDES_USING_METASTORE_FOR_SCHEMA);
if (serdes.contains(serializationLib)) {
throw new HiveException(table.getTableName() + " has serde " + serializationLib + " for which schema " +
"is already handled by HMS.");
}
Deserializer deserializer = table.getDeserializer(true);
try {
LOG.info("Updating metastore columns for table: {}", table.getTableName());
List fields = HiveMetaStoreUtils.getFieldsFromDeserializer(table.getTableName(), deserializer,
context.getConf());
StorageDescriptor sd = getStorageDescriptor(table, partition);
sd.setCols(fields);
} catch (org.apache.hadoop.hive.serde2.SerDeException | MetaException e) {
LOG.error("alter table update columns: {}", e);
throw new HiveException(e, ErrorMsg.GENERIC_ERROR);
}
}
}