[
https://issues.apache.org/jira/browse/CALCITE-2921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Danny Chan resolved CALCITE-2921.
---------------------------------
Resolution: Fixed
Fixed in
[01477c4|https://github.com/apache/calcite/commit/01477c42ded991aaa7b14cf72a6e4ea1a20edf5e],
thanks for the PR [~pzw2018] and the kindly reminder [~zabetak] !
> Allow NULL as argument to function calls
> ----------------------------------------
>
> Key: CALCITE-2921
> URL: https://issues.apache.org/jira/browse/CALCITE-2921
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.18.0
> Reporter: pengzhiwei
> Assignee: Julian Hyde
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.21.0
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Currently {{nullif(null,y)}} throws exception in verification. This is
> because translates {{nullif(x,y)}} to a case-when expression, just like "case
> when x = y then null else x". So when "x" is null literal,a exception throws
> out as follow:
> {code:java}
> ELSE clause or at least one THEN clause must be non-NULL
> {code}
> I have test in mysql,"nullif(null,y) works well.So I think we should allow
> this usage of "nullif".
> There are two ways to fix this issue:
> 1) Skip the check for "foundNotNull" in SqlCaseOperator#checkOperandTypes:
>
> {code:java}
> if (!foundNotNull) {
> // according to the sql standard we can not have all of the THEN
> // statements and the ELSE returning null
> if (throwOnFailure) {
> throw callBinding.newError(RESOURCE.mustNotNullInElse());
> }
> return false;
> }{code}
> However, as the comment says, we cannot have all of the THEN and ELSE
> returning null.
> 2) Disable the translation from nullif to case-when and keep "nullif" as it
> is.
> Any suggestion is welcomed,Thanks!
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
