Gautam Parai created DRILL-6833:
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Summary: MapRDB queries with Run Time Filters with
row_key/Secondary Index Should Support Pushdown
Key: DRILL-6833
URL: https://issues.apache.org/jira/browse/DRILL-6833
Project: Apache Drill
Issue Type: New Feature
Affects Versions: 1.15.0
Reporter: Gautam Parai
Assignee: Gautam Parai
Fix For: 1.15.0
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.
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