feat: lateral column alias reference (#507)

[maoxingda]

Closes #507

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b620d78) 99.49% compared to head (3cf66c2) 99.49%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #521   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files          41       41           
  Lines        2170     2185   +15     
=======================================
+ Hits         2159     2174   +15     
  Misses         11       11           

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[reata]

Thanks for the contribution. The code looks good to me.

One question: can we extend the current logic to handle lateral column alias at top level (not in a subquery), or do you plan to handle that in separate PR?

insert into public.tgt_tbl1
select
    name      as user_name,
    user_name as id -- backward reference
from
    public.src_tbl1
;

[maoxingda]

Thanks for response. I'm not sure if I can handle it, but I'll give it a try.

[reata]

We can also merge this and not closing #507, if top-level lateral column alias takes too much effort.

Just let me know your conclusion. Thanks for taking time investigating.

[maoxingda]

If it can be like this, that would be the best.

[maoxingda]

I will try to expand at top level.

[maoxingda]

We can also merge this and not closing #507, if top-level lateral column alias takes too much effort.

Just let me know your conclusion. Thanks for taking time investigating.

It seems that it doesn't require too much effort.