Hyunsik Choi created TAJO-1359:
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Summary: Add nested field projector and language extension to
project nested record
Key: TAJO-1359
URL: https://issues.apache.org/jira/browse/TAJO-1359
Project: Tajo
Issue Type: Sub-task
Components: parser, physical operator, planner/optimizer
Reporter: Hyunsik Choi
Assignee: Hyunsik Choi
Fix For: 0.11
We need to improve Projector class to get nested record fields, and we also add
some language extension to specify certain nested records in table schema. Both
works should be done together. Otherwise, we need to test an entire work
process.
Using dot '.' would be good for the syntax to specify nested fields. Many
systems (Hive, Google BigQuery, and Drill) already use this syntax. Probably,
many users are familiar with this form.
For example, if *employee* is a root nested record field and it includes *age*
and *name* fields, consisting two fields lastname and firstname, we can specify
them individually as follows:
{code}
SELECT employee.age, employee.name.lastname, employee.name.firstname FROM ...
{code}
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