[jira] [Created] (ASTERIXDB-2344) Predicate/LIMIT pushdown for primary scans

["Chen Luo (JIRA)" <ji...@apache.org>]

Chen Luo created ASTERIXDB-2344:
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             Summary: Predicate/LIMIT pushdown for primary scans
                 Key: ASTERIXDB-2344
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-2344
             Project: Apache AsterixDB
          Issue Type: Improvement
          Components: COMP - Compiler, STO - Storage
            Reporter: Chen Luo
            Assignee: Chen Luo


Currently we don't have limit/predicate pushdown for simple SPJ queries, e.g.,
{code}
select *
from ds_tweet
where friends_count < 10
limit 5;
{code}

It'll be nice to have:
1. pushdown predicates to dataset scan operator (IndexSearchOperatorNodePushable) such that only quantified records are returned to the outside;
2. pushdown LIMIT to dataset scan operator when possible so that the query can be terminated once enough records are fetched;




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