[jira] [Reopened] (CALCITE-2767) Invalid operands for Case operator in RexSqlStandardConvertletTable

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-2767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde reopened CALCITE-2767:
----------------------------------

Re-opening, to remind us that this is not "done". Even though we have a fix, we don't know the full scope of the problem.

> Invalid operands for Case operator in RexSqlStandardConvertletTable
> -------------------------------------------------------------------
>
>                 Key: CALCITE-2767
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2767
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.18.0
>            Reporter: Benoit Hanotte
>            Assignee: Julian Hyde
>            Priority: Minor
>             Fix For: 1.19.0
>
>
> `SqlCaseOperator.createCall()` requires 4 operands [1]:
>  # first value (i.e. CASE value WHEN...)
>  # when condifitions (as SqlNodeList)
>  # then values (as SqlNodeLists)
>  # else value
> `RexSqlStandardConvertletTable` always only pass 3 arguments [2] as it uses the generic form such as
> {code:java}
>  CASE WHEN condition1 THEN val2 ... ELSE val3 END{code}
> and never the form
> {code:java}
> CASE val WHEN condition1 THEN val2 ELSE val3{code}
> When calling `SqlCaseOperator.createCall()`, it needs to pass a null sql node for the first value in order to correctly provide the 4 expected arguments and not only the last 3.
> [1] [https://github.com/apache/calcite/blob/59b76701d9c805f51b0929577ca604fdbfe00b0b/core/src/main/java/org/apache/calcite/sql/fun/SqlCaseOperator.java#L288]
> [2] [https://github.com/apache/calcite/blob/59b76701d9c805f51b0929577ca604fdbfe00b0b/core/src/main/java/org/apache/calcite/rex/RexSqlStandardConvertletTable.java#L239]



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