[multistage] Util function to get list of all table names from query (or SQLNode/RelNode)
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cleanup
multi-stage
- Dominant language
- Java
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Description
In broker/controller, there's a need to access all the table names in a query. We have multiple implementations/ways to fetch this currently in our codebase.
1. `getTableNamesFromRelRoot(...)` in `MultistageBrokerRequestHandler`
2. extractTableNamesFromNode(SqlNode)
Creating this issue to unify all these calls.
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