SQLAlchemy Core indexing from list within SQL-CodePudding

I'm currently trying to convert some of my Snowflake SQL code to SQLAlchemy Core python code and I can't quite seem to figure out how to convert indexing an array within SQL to SQLAlchemy Core code.

For example if I have the following SQL query, how could I convert it to SQLAlchemy Core?

SELECT
    TRIM(SPLIT(CATEGORIES, ',')[0]) AS MAIN_CATEGORY,
    ...
FROM EXAMPLE_TABLE

So far I have tried this:

from sqlalchemy import func, select
...
select([
    func.trim(
        func.split(table.c.categories, ",")[0]
    ).label("main_category")
])

But it doesn't look like SQLAlchemy is able to convert the [0] python part to a SQL code.

Any way around this?

CodePudding user response：

well it seems they have support for trim, and split, so you could ether try SPLIT_PART, or GET

select 'a,b,c' as a
    ,split(a, ',') as b
    ,b[0] as c
    ,get(b, 0) as c1
    ,split_part(a, ',', 0) as c2;

A	B	C	C1	C2
a,b,c	[ "a", "b", "c" ]	"a"	"a"	a

Not sure if/how these map to what SQLAlchemy exposes/supports