Jaehwa Jung created TAJO-1952:
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Summary: Implement PartitionedFileFragment
Key: TAJO-1952
URL: https://issues.apache.org/jira/browse/TAJO-1952
Project: Tajo
Issue Type: Improvement
Components: Planner/Optimizer, Storage
Reporter: Jaehwa Jung
Assignee: Jaehwa Jung
Currently, PartitionedTableScanNode contains the list of partitions and it
seems to me that the list has some problems as following:
1. Duplicate Informs: Task contains Fragment which specify target directory or
target file for scanning. A path of partition lists already would write to
Fragment.
2. Network Resource: When scanning lost of partition, it will occupy network
resource, for example, several hundred kilobytes or more. It looks like an
unnecessary resource because Fragment already has the path of partitions.
I want to improve above problems by implementing new Fragment called
PartitionedFileFragment. Currently, I'm planning the implementation as
following:
* PartitionedFileFragment extends FileFragment and it contains the partition
path and the partition key values.
* Remove the path array of partitions from PartitionedTableScanNode.
* Implement a method for getting filtered partition directories in
FileTableSpace.
* Implement a method for making PartitionedFileFragment array.
* Before making splits, call above method and use it for making splits.
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