[jira] [Created] (CALCITE-1522) RelBuilder.union() hits assertion when arguments can't have a common row type

[Jess Balint (JIRA)]

Jess Balint created CALCITE-1522:
------------------------------------

             Summary: RelBuilder.union() hits assertion when arguments can't 
have a common row type
                 Key: CALCITE-1522
                 URL: https://issues.apache.org/jira/browse/CALCITE-1522
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Jess Balint
            Assignee: Julian Hyde
            Priority: Minor


Creating a union throws an AssertionError when a common row type cannot be 
computed. e.g. (modified {{RelBuilderTest.testUnion()}}):
{code}
        builder.scan("DEPT")
            .project(builder.field("DEPTNO"))
            .scan("EMP")
            .project(builder.field("EMPNO"), builder.field("SAL"))
            .union(true)
{code}

throws:
{noformat}
java.lang.AssertionError: LogicalUnion#4

        at 
org.apache.calcite.rel.AbstractRelNode.getRowType(AbstractRelNode.java:220)
        at 
org.apache.calcite.tools.RelBuilder$Frame.<init>(RelBuilder.java:1623)
        at 
org.apache.calcite.tools.RelBuilder$Frame.<init>(RelBuilder.java:1606)
        at org.apache.calcite.tools.RelBuilder.push(RelBuilder.java:220)
        at org.apache.calcite.tools.RelBuilder.setOp(RelBuilder.java:1032)
        at org.apache.calcite.tools.RelBuilder.union(RelBuilder.java:1052)
        at org.apache.calcite.tools.RelBuilder.union(RelBuilder.java:1042)
        at 
org.apache.calcite.test.RelBuilderTest.testUnion(RelBuilderTest.java:719)
{noformat}



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