Rui Wang

RATIS-1071. NettyClientRpc supports sendRequestAsync

2

## What changes were proposed in this pull request? Expose `sendRequestAsync` API in `NettyClientRpc`. ## What is the link to the Apache JIRA https://issues.apache.org/jira/browse/RATIS-1071 ## How was this patch tested?...

[SPARK-40296] Error class for DISTINCT function not found

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### What changes were proposed in this pull request? When users have a query like `SELECT SUM(a), DISTINCT(a, b) FROM table`, the DISTINCT is treated as a function but cannot...