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73a9ef9c4c
Creates the 'sys.impala_query_live' table in HMS using a similar 'CREATE TABLE' command to 'sys.impala_query_log'. Updates frontend to identify a System Table based on the '__IMPALA_SYSTEM_TABLE' property. Tables improperly marked with '__IMPALA_SYSTEM_TABLE' will error when attempting to scan them because no relevant scanner will be available. Creating the table in HMS simplifies supporting 'SHOW CREATE TABLE' and 'DESCRIBE EXTENDED', so allows them for parity with Query Log. Explicitly disables 'COMPUTE STATS' on system tables as it doesn't work correctly. Makes System Tables work with local catalog mode, fixing LocalCatalogException: Unknown table type for table sys.impala_query_live Updates workload management implementation to rely more on SystemTables.thrift definition, and adds DCHECKs to verify completeness and ordering. Testing: - adds additional test cases for changes to introspection commands - passes existing test_query_live and test_query_log suites Change-Id: Idf302ee54a819fdee2db0ae582a5eeddffe4a5b4 Reviewed-on: http://gerrit.cloudera.org:8080/21302 Reviewed-by: Riza Suminto <riza.suminto@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>