2010YOUY01 opened a new issue, #16176:
URL: https://github.com/apache/datafusion/issues/16176
### Is your feature request related to a problem or challenge?
It would be great to add an example under `datafusion-examples` to
illustrate the following:
1. Default Planning and Optimization Strategy
- What is the default strategy for planning and optimizing queries with
joins: How does the engine decide the physical join type (e.g., sort-merge join
vs. hash join)?
- How is the join order determined?
Introducing the high-level internal optimization strategy can help users
better understand and perform their own optimizations.
2. Example Queries and EXPLAIN Output
- Provide example queries and show how the default policies optimize
them.
- Explain how to interpret the output of the `EXPLAIN` statement.
3. Relevant Configuration Settings
Include explanation for the related configurations (note that some
settings might not yet be supported in DF):
- If multiple physical join types are applicable, how can a user disable
or prefer a specific join type?
(e.g., for a simple inner join with equality conditions, how to force a
Nested Loop Join in the execution plan)
- How to override the join order?
(e.g., the optimizer chooses `t1`, `t3`, `t2` but the user prefers
`t1`, `t2`, `t3`)
- Any other relevant configuration options.
### Describe the solution you'd like
_No response_
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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