rdblue opened a new pull request, #4773:
URL: https://github.com/apache/iceberg/pull/4773
This adds a `SessionCatalog` interface for engines that share catalog
instances across sessions.
`SessionCatalog` is like `Catalog`, but passes a `SessionContext` object in
each call. This session context can be used to carry identity and credentials,
which are passed through to the catalog service. `SessionCatalog` does not
extend `Catalog` to avoid bugs where context is accidentally not passed.
Because `SessionCatalog` does not implement `Catalog`, a base implementation
class is also included in this PR that adapts `SessionCatalog` to `Catalog`
using `withContext` and `asCatalog` methods. For example:
```java
boolean exists = sessionCatalog.withContext(sessionContext, (Catalog
catalog) -> {
return catalog.tableExists(tableIdent);
});
```
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