Jihoon Son created TAJO-1577:
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Summary: Add test cases to verify join plans
Key: TAJO-1577
URL: https://issues.apache.org/jira/browse/TAJO-1577
Project: Tajo
Issue Type: Test
Components: test
Reporter: Jihoon Son
Fix For: 0.11.0
We are lacking test cases to verify query plans even though they directly
affect to query processing performance. This is important especially for join
queries because their plans can be changed while optimizing join order that
affects to performance significantly. So, we need to verify the optimal join
plan first.
There can be some approaches to test query plans. Here are some candidates what
I consider.
* Adding a special class that verifies query plans while traversing it.
* Verifying the result of *EXPLAIN* query.
I think that the second approach looks good. Here are some reasons.
* Easy to implement. It's just string match.
* Easy to verify both logical plan and global plan without adding any special
classes to traverse query plan.
* This is the most important reason. With the second approach, we can guarantee
that our query planner is deterministic.
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