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https://issues.apache.org/jira/browse/CALCITE-3215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16896798#comment-16896798
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Danny Chan commented on CALCITE-3215:
-------------------------------------
Cast is strong in many RDBMS, for this expression below:
{code:sql}
select cast('abc' as UNSIGNED) from t; -- returns 0 in MYSQL
select cast('abc' as int); -- oracle 11g R2, POSTGRES, MS-SERVER throws invalid
numeric
{code}
but for HIVE and SPARK, it just returns null.
> Simplification may have not fully simplified IS NOT NULL expressions
> --------------------------------------------------------------------
>
> Key: CALCITE-3215
> URL: https://issues.apache.org/jira/browse/CALCITE-3215
> Project: Calcite
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> CALCITE-2929 have added a safety check to avoid simplifying problematic cases.
> The safety check apparently misses some kinds, for example: {{UNARY_PLUS}}
> {code}
> @Test public void testIsNullSimplificationWithUnaryPlus() {
> RexNode expr =
> isNotNull(coalesce(unaryPlus(vInt(1)), vIntNotNull(0)));
> RexNode s = simplify.simplifyUnknownAs(expr, RexUnknownAs.UNKNOWN);
> assertThat(expr.isAlwaysTrue(), is(true));
> assertThat(s, is(trueLiteral));
> }
> {code}
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