[DRILL-626] Project push down into HBase scan

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Assignee: Aditya Kishore
• Reporter: Aditya Kishore
• Created: 03/May/14 23:49
• Updated: 10/May/14 12:00
• Resolved: 10/May/14 12:00

Description

If a query against an HBase table requires only a subset of columns, we should qualify the HBase scan with these columns.

For example

    SELECT row_key, f['c1'], f['c2'], g FROM hbase.MyTable

should qualify he HBase scan as families => [g["ALL"], f["c1", "c2"]]

Issue Links

• is blocked by: DRILL-654 Fix for MaterializedField.getAsSchemaPath()
• is blocked by: DRILL-655 Miscellaneous fixes for SchemaPath