[jira] [Commented] (CALCITE-4915) Query with unqualified common column and NATURAL JOIN fails

["Sergey Nuyanzin (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-4915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17683045#comment-17683045 ] 

Sergey Nuyanzin commented on CALCITE-4915:
------------------------------------------

while testing i realized that a query with 2 natural joins could fail on assert at {{org.apache.calcite.sql.validate.SqlValidatorImpl#expandExprFromJoin}}

e.g. query (taken from join.iq + 1 natural join)

{code:sql}
select deptno, dname, empno, ename
from "scott".emp
natural join "scott".dept
natural join "scott".dept as d;
{code}

fails with 
{noformat}
> java.lang.AssertionError
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.expandExprFromJoin(SqlValidatorImpl.java:523)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.expandCommonColumn(SqlValidatorImpl.java:590)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.access$100(SqlValidatorImpl.java:168)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl$SelectExpander.visit(SqlValidatorImpl.java:6776)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl$SelectExpander.visit(SqlValidatorImpl.java:6766)
> 	at org.apache.calcite.sql.SqlIdentifier.accept(SqlIdentifier.java:324)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl$Expander.go(SqlValidatorImpl.java:6600)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.expandSelectExpr(SqlValidatorImpl.java:6173)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.expandSelectItem(SqlValidatorImpl.java:465)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelectList(SqlValidatorImpl.java:4561)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3765)
> 	at org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:61)
> 	at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:88)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:1132)
> 	at org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:1103)
> 	at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:248)
...
{noformat}

> Query with unqualified common column and NATURAL JOIN fails
> -----------------------------------------------------------
>
>                 Key: CALCITE-4915
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4915
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Aleksey Plekhanov
>            Assignee: Aleksey Plekhanov
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Query with unqualified common column and NATURAL JOIN:
> {noformat}
> SELECT deptno FROM emp NATURAL JOIN dept{noformat}
> Fails with "Column 'DEPTNO' is ambiguous" error.



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