Parsing nested joins without parenthesis

[10bas10]

By applying the nested join you are able to LEFT JOIN a combined set where an INNER JOIN is applied. However the last ON syntax isnt parsed properly:

import sqlglot
from sqlglot import optimizer
expr = sqlglot.parse_one("""
SELECT
 a.id
,b.test
,c.test2
FROM a
LEFT JOIN
    b
    INNER JOIN c
        ON c.id = b.id
    ON b.id = a.id
""", read="tsql")

Resulting in an error:

ParseError: Invalid expression / Unexpected token. Line 11, Col: 6.

[tobymao]

i believe this is a duplicate. @georgesittas if this is too difficult to do, let's close it as not planned. i believe i did that the last time this was filed

[tobymao]

i can't find the old issue, but i'm going to close this again as not planned.

[10bas10]

What does "not planned" mean?

[georgesittas]

@tobymao in order to handle this, I think we'd need to make _parse_join recursive so that each ON clause is matched with the corresponding join. I'm not sure if it'll be so easy, though (e.g. what changes need to be made in the optimizer?).

[tobymao]

What does "not planned" mean?

it means we’re not committing to doing this.

we may if it’s easy

[tobymao]

i have a fix for this coming soon