Filtering a database using __icontains fails for JSONB fields

Describe the bug

In the previous version of the library (tortoise-orm==0.16.4 namely), filtering of a database using __icontains on a JSONB field of a model would convert the field to VARCHAR and then search for the requested substring. However, for tortoise-orm==0.16.8 that does not work and fails with an error:

function upper(jsonb) does not exist
HINT:  No function matches the given name and argument types.
You might need to add explicit type casts.

To Reproduce

The code to execute the query:

phrases = ["a red apple", "a book", "the Sun", "a big store"]
query = Q()
for phrase in phrases:
    query = query & Q(poem__icontains=phrase)
    collection = collection.filter(query)
total_filtered = await collection.count()

where collection is a table that has the poem field, which in turn is of a JSONB type. For tortoise-orm==0.16.8 the raw query is (and it fails with the error above):

SELECT COUNT(*) FROM "collection" WHERE UPPER("phrases") LIKE UPPER(\'%a red apple%\') ESCAPE \'\\\

Expected behavior

SELECT COUNT(*) FROM "collection" WHERE UPPER(CAST("phrases" AS VARCHAR)) LIKE UPPER('%a red apple%')

Additional context

PostgreSQL is used for database handling.

[odimko]

yes, works great. thank you both @lntuition and @grigi for the fast replies and action!

[lntuition]

Ah, I found CAST was removed at 42adca39. I think we should revert it. Thank you for your report !