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https://issues.apache.org/jira/browse/CALCITE-2695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16696150#comment-16696150
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Zoltan Haindrich commented on CALCITE-2695:
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opened [pr934|https://github.com/apache/calcite/pull/934]
also enabled to run simplify below cast
> Simplify casts which are only widening nullability
> --------------------------------------------------
>
> Key: CALCITE-2695
> URL: https://issues.apache.org/jira/browse/CALCITE-2695
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> There are cases in which casts are added; but they are not neccessary.
> {code}
> @Test public void testSimplifyRedundantCast() {
> RexNode expr = cast(isTrue(vBoolNotNull()), tBoolean(true));
> assertThat(expr.getType().isNullable(), is(true));
> RexNode result = simplify.simplifyUnknownAs(expr, RexUnknownAs.UNKNOWN);
> assertThat(result.getType().isNullable(), is(false));
> }
> {code}
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