Github user blrunner commented on the pull request:
https://github.com/apache/tajo/pull/846#issuecomment-162450015
@hyunsik
I changed ```PartitionFileFragment``` by extending ```FileFragment```
because there are some codes for only ```FileFragment```. For example, you can
see cast codes as following:
```
public FileScanner(Configuration conf, final Schema schema, final
TableMeta meta, final Fragment fragment) {
this.conf = conf;
this.meta = meta;
this.schema = schema;
this.fragment = (FileFragment)fragment;
this.tableStats = new TableStats();
this.columnNum = this.schema.size();
}
```
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