devoopsman45 opened a new pull request, #102:
URL: https://github.com/apache/datafusion-java/pull/102
## Which issue does this PR close?
- Closes #101 .
## Rationale for this change
SessionContext can let a caller register tables but there is no way to
Check whether a table name is already registered
Remove a registered table from the session
This makes it tough to write safer code while registering
## What changes are included in this PR?
- `SessionContext.tableExists(String name)` — returns true if a table
with that name is registered in the session
- `SessionContext.deregisterTable(String name)` — removes a registered
table; no-op if the name is not found
Both are thin JNI wrappers over DataFusion's existing
`SessionContext::table_exist` and `SessionContext::deregister_table`
on the Rust side.
## Are these changes tested?
Yes. `SessionContextTableRegistrationTest` covers:
- tableExists returns false for an unregistered table
- tableExists returns true after registerCsv
- deregisterTable removes a registered table
- deregisterTable is a no-op for an unregistered table
- Both methods throw IllegalStateException on a closed context
-->
## Are there any user-facing changes?
Yes — two new public methods on `SessionContext`. Additive only, no
breaking changes.
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