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[SPARK-10092] [SQL] Multi-DB support follow up. https://issues.apache.org/jira/browse/SPARK-10092 This pr is a follow-up one for Multi-DB support. It has the following changes: * `HiveContext.refreshTable` now accepts `dbName.tableName`. * `HiveContext.analyze` now accepts `dbName.tableName`. * `CreateTableUsing`, `CreateTableUsingAsSelect`, `CreateTempTableUsing`, `CreateTempTableUsingAsSelect`, `CreateMetastoreDataSource`, and `CreateMetastoreDataSourceAsSelect` all take `TableIdentifier` instead of the string representation of table name. * When you call `saveAsTable` with a specified database, the data will be saved to the correct location. * Explicitly do not allow users to create a temporary with a specified database name (users cannot do it before). * When we save table to metastore, we also check if db name and table name can be accepted by hive (using `MetaStoreUtils.validateName`). Author: Yin Huai <[email protected]> Closes #8324 from yhuai/saveAsTableDB.