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https://issues.apache.org/jira/browse/CALCITE-6040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17772804#comment-17772804
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Ran Tao commented on CALCITE-6040:
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Yes, it seems to be a bug. By explaining the plan, the null converted to
INTEGER type.
> SqlOperatorFixture check result type failed for converted types
> ---------------------------------------------------------------
>
> Key: CALCITE-6040
> URL: https://issues.apache.org/jira/browse/CALCITE-6040
> Project: Calcite
> Issue Type: Bug
> Components: tests
> Affects Versions: 1.35.0
> Reporter: Ran Tao
> Priority: Major
>
> we have a simple test case:
> {code:java}
> f.checkScalar("map[1, null]", "{1=null}",
> "(INTEGER NOT NULL, NULL) MAP NOT NULL"); {code}
> The result is:
> {noformat}
> java.lang.AssertionError: Query: values (map[1, null])
> Expected: is "(INTEGER NOT NULL, NULL) MAP NOT NULL"
> but: was "(INTEGER NOT NULL, INTEGER) MAP NOT NULL"
> {noformat}
> however, the asserted actual result "(INTEGER NOT NULL, INTEGER) MAP NOT
> NULL" for this case is wrong. If we switch to this asserted actual result it
> throws another exception:
> {noformat}
> java.lang.AssertionError: Query: select map[p0, null] from (values (1)) as
> t(p0)
> Expected: is "(INTEGER NOT NULL, INTEGER) MAP NOT NULL"
> but: was "(INTEGER NOT NULL, NULL) MAP NOT NULL"
> {noformat}
> No matter how you write this result type in test case, it is wrong.
> by showing the plan, it seems the deduced value type has converted to INTEGER.
> {noformat}
> 0: jdbc:calcite:model=src/test/resources/mode> explain plan for select map[1,
> null];
> +------------------------------------------------------------------------------------------------------------+
> | PLAN
> |
> +------------------------------------------------------------------------------------------------------------+
> | EnumerableCalc(expr#0=[\{inputs}], expr#1=[1], expr#2=[null:INTEGER],
> expr#3=[MAP($t1, $t2)], EXPR$0=[$t3])
> EnumerableValues(tuples=[[\{ 0 }]])
> |
> +------------------------------------------------------------------------------------------------------------+
> {noformat}
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