Wenzheng Liu created CALCITE-2231:
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Summary: union selects as subselect in select clause unparsed
result is not valid
Key: CALCITE-2231
URL: https://issues.apache.org/jira/browse/CALCITE-2231
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Wenzheng Liu
Assignee: Julian Hyde
for example, "select a1, b1 from t1, (select a2, b2 from t2 union select a3, b3
from t3)" will be unparsed as "select a1, b1, from t1, select a2, b2 from t2
union select a3, b3 from t3". Obviously, "(" and ")" is needed in union selects
clause
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