DDC-2780 - Fixed issue with IS NULL on join aliases

[byonchev]

#3528 Added fallback to SingleValuedPathExpression

[kipelovets]

Why isn't this one merged?

[vbyndych]

Without this patch IS NULL and IS NOT NULL expressions don't work in sub-queries. It would be really cool if somebody merge it.

[amerryma]

Yes, I would like to see this merged. Having to fork right now.

[fnagel]

Any workaround for this expect forking or using lazy loading?

[byonchev]

I'm using the "netresearch/composer-patches-plugin" composer package to patch it on update for the last 8 months - it seems ok.

[hvt]

Would be really great if this PR could be merged.

If there's anything against it, what is it?

[HugoMestre]

A merge here would be great. Any time now.

[lcobucci]

I'll take a look on it this evening or tomorrow but would be amazing if @byonchev could sync this branch with master and apply the same conventions we applied there (to make it a bit faster for me to review and merge).

[lcobucci]

Just to update you guys, I've discussed this with @guilhermeblanco and the changes are not exactly correct (they're almost right) but I'll fix them and we'll merge this very soon on master (and I believe it will only be available for v2.6).

[lcobucci]

Closing since it's being handled on #6328.