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https://issues.apache.org/jira/browse/CALCITE-1268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336478#comment-15336478
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Julian Hyde commented on CALCITE-1268:
--------------------------------------
The problem is with a CHAR(5) and CHAR(7) that temporarily become a CHAR(7) and
ultimately become a VARCHAR(7). The CHAR(5) value must not have two trailing
spaces added. There is a test case that demonstrates this issue -- you can
figure out whether you have the right solution when you hit it!
> Union should apply explicit Project over its children if they have different
> but coercible types
> ------------------------------------------------------------------------------------------------
>
> Key: CALCITE-1268
> URL: https://issues.apache.org/jira/browse/CALCITE-1268
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.7.0
> Reporter: Maryann Xue
> Assignee: Julian Hyde
>
> Test case in SqlToRelConverterTest:
> {code}
> @Test public void testUnionExprTypes() {
> check(
> "select empno, sal from emp "
> + "union all "
> + "select deptno, deptno from dept",
> "${plan}");
> }
> {code}
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