guixiaowen opened a new issue, #1431:
URL: https://github.com/apache/auron/issues/1431
Add `EmptyNativeRDD` extending `NativeRDD`.
The characteristics of `EmptyNativeRDD` are:
1. it extends `NativeRDD`;
2. `rddPartitions` is empty;
3. calling the `compute` method will throw an exception.
The purpose of `EmptyNativeRDD` is:
1. Flexible placeholder, simplifying DAG construction, reducing code
complexity, and keeping the DAG structure complete;
2. Reduces redundant implementations, achieving a clearer inheritance
structure.
Scenarios for using `EmptyNativeRDD`:
1. When `NativeParquetScan` generates a `NativeRDD`, if `filePartitions` is
0, an `EmptyNativeRDD` is created;
2. When `NativeOrcScan` generates a `NativeRDD`, if `filePartitions` is 0,
an `EmptyNativeRDD` is created.
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