Jesus Camacho Rodriguez created HIVE-18825:
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Summary: Define ValidTxnList before starting query optimization
Key: HIVE-18825
URL: https://issues.apache.org/jira/browse/HIVE-18825
Project: Hive
Issue Type: Improvement
Components: Transactions
Affects Versions: 3.0.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Consider a set of tables used by a materialized view where inserts happened
after the materialization was created. To compute incremental view maintenance,
we need to be able to filter only new rows from those base tables. That can be
done by inserting a filter operator with condition e.g. {{ROW__ID.transactionId
< highwatermark and ROW__ID.transactionId NOT IN(<open txns>)}} on top of the
MVs query definition and triggering the rewriting (which should in turn produce
a partial rewriting). However, to do that, we need to have a value for
{{ValidTxnList}} during query compilation so we know the snapshot that we are
querying.
This patch aims to generate {{ValidTxnList}} before query compilation. There
should not be any visible changes for end user.
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