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ANALYZE TABLE [db_name.]tablename [PARTITION(partcol1[=val1], partcol2[=val2], ...)]  -- (Note: SinceFully support qualified table name since Hive 1.2.0, Hive starts to fully support qualified table name for this commandsee HIVE-10007 )
  COMPUTE STATISTICS 
  [FOR COLUMNS]          -- (Note: Hive 0.10.0 and later.)
  [NOSCAN];

When the user issues that command, he may or may not specify the partition specs. If the user doesn't specify any partition specs, statistics are gathered for the table as well as all the partitions (if any). If certain partition specs are specified, then statistics are gathered for only those partitions. When computing statistics across all partitions, the partition columns still need to be listed. Since Hive 1.2.0, Hive starts to fully support qualified table name in this command. User can only compute the statistics for a table which is under current database if a non-qualified table name is used in this command.

When the optional parameter NOSCAN is specified, the command won't scan files so that it's supposed to be fast. Instead of all statistics, it just gathers the following statistics:

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