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[SPARK-18961][SQL] Support
SHOW TABLE EXTENDED ... PARTITION
statement
## What changes were proposed in this pull request? We should support the statement `SHOW TABLE EXTENDED LIKE 'table_identifier' PARTITION(partition_spec)`, just like that HIVE does. When partition is specified, the `SHOW TABLE EXTENDED` command should output the information of the partitions instead of the tables. Note that in this statement, we require exact matched partition spec. For example: ``` CREATE TABLE show_t1(a String, b Int) PARTITIONED BY (c String, d String); ALTER TABLE show_t1 ADD PARTITION (c='Us', d=1) PARTITION (c='Us', d=22); -- Output the extended information of Partition(c='Us', d=1) SHOW TABLE EXTENDED LIKE 'show_t1' PARTITION(c='Us', d=1); -- Throw an AnalysisException SHOW TABLE EXTENDED LIKE 'show_t1' PARTITION(c='Us'); ``` ## How was this patch tested? Add new test sqls in file `show-tables.sql`. Add new test case in `DDLSuite`. Author: jiangxingbo <[email protected]> Closes apache#16373 from jiangxb1987/show-partition-extended.
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