Pengcheng Xiong created HIVE-9780:
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Summary: Add another level of explain for RDBMS audience
Key: HIVE-9780
URL: https://issues.apache.org/jira/browse/HIVE-9780
Project: Hive
Issue Type: Improvement
Reporter: Pengcheng Xiong
Assignee: Pengcheng Xiong
Priority: Minor
Current Hive Explain (default) is targeted at MR Audience. We need a new level
of explain plan to be targeted at RDBMS audience. The explain requires these:
1) The focus needs to be on what part of the query is being executed rather
than internals of the engines
2) There needs to be a clearly readable tree of operations
3) Examples - Table scan should mention the table being scanned, the Sarg, the
size of table and expected cardinality after the Sarg'ed read. The join should
mention the table being joined with and the join condition. The aggregate
should mention the columns in the group-by.
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