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Adds a new WITH STATS option to the SHOW CREATE TABLE statement to emit additional SQL statements for recreating table statistics and partitions. When specified, Impala outputs: - Base CREATE TABLE statement. - ALTER TABLE ... SET TBLPROPERTIES for table-level stats. - ALTER TABLE ... SET COLUMN STATS for all non-partition columns, restoring column stats. - For partitioned tables: - ALTER TABLE ... ADD PARTITION statements to recreate partitions. - Per-partition ALTER TABLE ... PARTITION (...) SET TBLPROPERTIES to restore partition-level stats. Partition output is limited by the PARTITION_LIMIT query option (default 1000). Setting PARTITION_LIMIT=0 includes all partitions and emits a warning if the limit is exceeded. Tests added to verify correctness of emitted statements. Default behavior of SHOW CREATE TABLE remains unchanged for compatibility. Change-Id: I87950ae9d9bb73cb2a435cf5bcad076df1570dc2 Reviewed-on: http://gerrit.cloudera.org:8080/23536 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>