Stamatis Zampetakis created CALCITE-4702:
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Summary: Error when executing query with GROUP BY constant via
JDBC adapter
Key: CALCITE-4702
URL: https://issues.apache.org/jira/browse/CALCITE-4702
Project: Calcite
Issue Type: Bug
Components: core, jdbc-adapter
Affects Versions: 1.27.0
Reporter: Stamatis Zampetakis
Assignee: Stamatis Zampetakis
The following functionally equivalent SQL queries are accepted by Calcite and
produce a valid plan
{noformat}
select avg(salary) from employee group by true
select avg(salary) from employee group by 'a'
{noformat}
but they may fail if they are executed via the JDBC adapter since not all DBMS
allow grouping by constants expressions. Moreover, what works for one may not
work for the other.
+Examples+
The {{GROUP BY TRUE}} query works in Postgres, and MySQL but fails in Redshift
with the following exception:
{noformat}
com.amazon.redshift.util.RedshiftException: ERROR: non-integer constant in
GROUP BY
{noformat}
The {{GROUP BY 'a'}} query works in MySQL but fails in Postgres with the
following exception:
{noformat}
ERROR: non-integer constant in GROUP BY
{noformat}
The {{GROUP BY}} constant essentially means {{GROUP BY}} nothing and there is a
nice [blog
post|https://blog.jooq.org/2018/05/25/how-to-group-by-nothing-in-sql/] listing
some limitations of various DBMS.
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