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#### What changes were proposed in this pull request? This PR is to provide a native support for DDL `DROP VIEW` and `DROP TABLE`. The PR includes native parsing and native analysis. Based on the HIVE DDL document for [DROP_VIEW_WEB_LINK](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL- DropView ), `DROP VIEW` is defined as, **Syntax:** ```SQL DROP VIEW [IF EXISTS] [db_name.]view_name; ``` - to remove metadata for the specified view. - illegal to use DROP TABLE on a view. - illegal to use DROP VIEW on a table. - this command only works in `HiveContext`. In `SQLContext`, we will get an exception. This PR also handles `DROP TABLE`. **Syntax:** ```SQL DROP TABLE [IF EXISTS] table_name [PURGE]; ``` - Previously, the `DROP TABLE` command only can drop Hive tables in `HiveContext`. Now, after this PR, this command also can drop temporary table, external table, external data source table in `SQLContext`. - In `HiveContext`, we will not issue an exception if the to-be-dropped table does not exist and users did not specify `IF EXISTS`. Instead, we just log an error message. If `IF EXISTS` is specified, we will not issue any error message/exception. - In `SQLContext`, we will issue an exception if the to-be-dropped table does not exist, unless `IF EXISTS` is specified. - Data will not be deleted if the tables are `external`, unless table type is `managed_table`. #### How was this patch tested? For verifying command parsing, added test cases in `spark/sql/hive/HiveDDLCommandSuite.scala` For verifying command analysis, added test cases in `spark/sql/hive/execution/HiveDDLSuite.scala` Author: gatorsmile <gatorsmile@gmail.com> Author: xiaoli <lixiao1983@gmail.com> Author: Xiao Li <xiaoli@Xiaos-MacBook-Pro.local> Closes #12146 from gatorsmile/dropView. |
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