Vladimir Ozerov created IGNITE-8600:
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Summary: SQL: lazy row materialization
Key: IGNITE-8600
URL: https://issues.apache.org/jira/browse/IGNITE-8600
Project: Ignite
Issue Type: Task
Components: sql
Affects Versions: 2.5
Environment: Currently our index cursor materializes rows as soon as
they are encountered in an index page. This is necessary to protect ourselves
from concurrent data modification. However, materialized rows might be filtered
out later due to additional filters. In addition, there is a chance that only
indexed fields is needed by query.
We can do the following:
1) Introduce new mode that will return partially materialized rows, with only
inline index fields initialized. When some non-initialized attribute is
requested, we go to data page and materialize the whole row
2) Enable this mode for MVCC by default
3) Optionally enable this mode for non-MVCC read-only mode through additional
flag.
Reporter: Vladimir Ozerov
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