SQL: allow table select in join

[ukclivecox]

Is your feature request related to a problem?

If you try to select all columns in a table after a join you get a not yet implemented error.

import daft

df1 = daft.from_pydict({"idx":[1,2],"val":[10,20]})

df2 = daft.from_pydict({"idx":[1,2],"score":[0.1,0.2]})

df_sql = daft.sql("select df2.* from df1 left join df2 on (df1.idx=df2.idx)").show()

Describe the solution you'd like

Ability to select all columns in a joined table.

Describe alternatives you've considered

No easy solution - you could if you knew the columns select then 1 by 1 and join into 1 table...

Additional Context

Testing with nightly build 0.3.8+dev0019.e4c6f3fa that has additions for joins from #3066

Would you like to implement a fix?

Yes