Jihoon Son created TAJO-573:
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Summary: Allow the same column in a schema
Key: TAJO-573
URL: https://issues.apache.org/jira/browse/TAJO-573
Project: Tajo
Issue Type: Improvement
Components: catalog
Reporter: Jihoon Son
Fix For: 0.8-incubating
Recently, I have been working on TAJO-554, and I found that we should allow two
or more same columns in a schema to handle the asterisk properly.
My try in TAJO-554 is rewriting asterisks with their relations' schemas. So,
the resulting schema can contain multiple same columns. Here is an example.
{noformat}
postgres=# select n_name, n_nationkey+10, *, n_regionkey from nation;
n_name | ?column? | n_nationkey | n_name
| n_regionkey | n_comment
| n_regionkey
---------------------------+----------+-------------+---------------------------+-------------+--------------------------------------------------------------------------------------------------------------------+-------------
ALGERIA | 10 | 0 | ALGERIA
| 0 | haggle. carefully final deposits detect slyly agai
| 0
ARGENTINA | 11 | 1 | ARGENTINA
| 1 | al foxes promise slyly according to the regular accounts. bold
requests alon | 1
{noformat}
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