[DRILL-6833] MapRDB queries with Run Time Filters with row_key/Secondary Index Should Support Pushdown

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.15.0
• Fix Version/s: 1.15.0
• Labels: ready-to-commit
• Assignee: Gautam Parai
• Reporter: Gautam Parai
• Reviewer: Aman Sinha
• Created: 06/Nov/18 22:53
• Updated: 16/Nov/18 00:37
• Resolved: 16/Nov/18 00:37

Description

Drill should push down all row key filters to maprDB for queries that only have WHERE conditions on row_keys. In the following example, the query only has where clause on row_keys:

select t.mscIdentities from dfs.root.`/user/mapr/MixTable` t where t.row_key=
(select max(convert_fromutf8(i.KeyA.ENTRY_KEY)) from dfs.root.`/user/mapr/TableIMSI` i where i.row_key='460021050005636')

row_keys can return at most 1 row. So the physical planning must leverage MapRDB row_key push down to execute the sub query, with its results execute the outer query. Currently only the inner query is pushed down. The outer query requires a table scan.

Issue Links

• links to: GitHub Pull Request #1532