[CALCITE-5390] RelDecorrelator throws NullPointerException

[iwanttobepowerful]

CALCITE-5390

[iwanttobepowerful]

I think the frameStack introduced by @suibianwanwank simulates the de Bruijn indexes mentioned by @julianhyde .

[iwanttobepowerful]

We might be able to delete getCorRel. I found during debugging that this function is never reached anymore.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
82.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[iwanttobepowerful]

@dssysolyatin @rubenada @mihaibudiu @NobiGo @suibianwanwank
can you help review this PR? Thx.

[mihaibudiu]

@iwanttobepowerful I think you have permissions to merge this PR, so I will let you do it.
Do not forget to resolve the corresponding JIRA issue, and to add the commit to the issue when you do that.

[iwanttobepowerful]

@iwanttobepowerful I think you have permissions to merge this PR, so I will let you do it. Do not forget to resolve the corresponding JIRA issue, and to add the commit to the issue when you do that.

I don't have access to update the Jira ticket status.

My jira ID is zwh.

[xiedeyantu]

@iwanttobepowerful I think you have permissions to merge this PR, so I will let you do it. Do not forget to resolve the corresponding JIRA issue, and to add the commit to the issue when you do that.

I don't have access to update the Jira ticket status.

My jira ID is zwh.

You can email private@calcite.apache.org; a PMC member should be able to help you resolve this. I probably don't have the same permissions as you to handle this issue.