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https://issues.apache.org/jira/browse/CALCITE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16960846#comment-16960846
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Feng Zhu commented on CALCITE-3433:
-----------------------------------
The bug is caused by wrong codegen for BinaryExpression. Even the expressions
are box types, it still adopts "==" to compare them.
The code for "union" query is demonstated as below, while for the other correct
query, the comparison is simplified as "true" before codegen phase.
{code:java}
public Object current() {
final Object[] current = (Object[]) inputEnumerator.current();
final Long inp0_ = (Long) current[0];
final Long inp1_ = (Long) current[1];
return inp0_ == null || inp1_ == null ? (Boolean) null :
Boolean.valueOf(inp0_ == inp1_);
}
{code}
I will take a look and fix this issue
> EQUALS operator between date/timestamp types returns false if the type is
> nullable
> ----------------------------------------------------------------------------------
>
> Key: CALCITE-3433
> URL: https://issues.apache.org/jira/browse/CALCITE-3433
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.17.0, 1.18.0, 1.19.0, 1.20.0, 1.21.0
> Reporter: jiezouSH
> Priority: Major
>
> sql
> select time0=time1 from (select timestamp'2000-12-30 21:07:32'as
> time0,timestamp'2000-12-30 21:07:32'as time1 union all select cast(null as
> timestamp) as time0,cast(null as timestamp) as time1) calcs
> answer is false
> but
> sql
> select time0=time1 from (select timestamp'2000-12-30 21:07:32'as
> time0,timestamp'2000-12-30 21:07:32'as time1) calcs
> answer is true
>
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