dongjoon-hyun opened a new pull request #608:
URL: https://github.com/apache/orc/pull/608
### What changes were proposed in this pull request?
This PR aims to support `LoadBalancingKMSClientProvider` as a key provider.
### Why are the changes needed?
When `LoadBalancingKMSClientProvider` is used as a `KeyProvider`,
`ClassCastException` occurs currently.
```java
public class LoadBalancingKMSClientProvider extends KeyProvider implements
CryptoExtension,
KeyProviderDelegationTokenExtension.DelegationTokenExtension {
```
### How was this patch tested?
Manually.
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