[SPARK-15752][SQL] Optimize metadata only query that has an aggregate whose children are deterministic project or filter operators.

## What changes were proposed in this pull request?
when query only use metadata (example: partition key), it can return results based on metadata without scanning files. Hive did it in HIVE-1003.

## How was this patch tested?
add unit tests

Author: Lianhui Wang <lianhuiwang09@gmail.com>
Author: Wenchen Fan <wenchen@databricks.com>
Author: Lianhui Wang <lianhuiwang@users.noreply.github.com>

Closes #13494 from lianhuiwang/metadata-only.