Keuntae Park created TAJO-1265:
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Summary: min(), max() does not handle null properly
Key: TAJO-1265
URL: https://issues.apache.org/jira/browse/TAJO-1265
Project: Tajo
Issue Type: Bug
Reporter: Keuntae Park
Assignee: Keuntae Park
Priority: Minor
In other DBs like oracle and postgreSQL,
null is excluded from calculation of min() and max() value until there is no
non-null value in the given column, in which case, it returns null.
However, current implementation of Tajo considers null as
0 for int or long column, 0.0 for float or double column, or "" for text column.
It needs to handle null value separately from non-null values in min() and
max() calculation.
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