Details
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New Feature
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Status: Resolved
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Major
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Resolution: Fixed
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1.15.0
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None
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.
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