ramkrishna.s.vasudevan created FLINK-5752:
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Summary: Support push down projections for HBaseTableSource
Key: FLINK-5752
URL: https://issues.apache.org/jira/browse/FLINK-5752
Project: Flink
Issue Type: Sub-task
Reporter: ramkrishna.s.vasudevan
Assignee: ramkrishna.s.vasudevan
This is after the discussion to create NestedProjectableTableSource.
Currently we support nested schema for the non-relational type of DBs like
HBase.
But this does not allow push down projection. This JIRA is to implement that.
I just did a POC on the existing PR https://github.com/apache/flink/pull/3149.
The idea was to allow the family#quallifier to be specified in the query
directly and parse the family and qualifier info and directly push down for
projections.
I tried using fam$qual (with $) as separator but that had SQL parse error.
Hence went with '_' as the separator and it worked.
So now in order to maintain the order in which the projection has to be done we
need to have a LinkedHashMap which has the qualifier to typeinfo mapping. This
is because with f1_q1, f1_q2 as the schema, we could always project f1_q2 and
the selection could be f1_q1. In that case the order of how the projection is
done is very important so that there is no type mismatch.
[~fhueske], [~tonycox], [~jark]
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