Fix Postgres cannot extract elements from a scalar error for JSON null arrays

What was breaking?

jsonb_array_elements() throws PSQLException: cannot extract elements from a scalar when encountering JSON null values in JSONB array fields. This affected both UnnestExpression queries and ArrayRelationalFilterExpression.ANY filters.

How was the bug reproduced?

Added test data with props.colors: null (JSON null, not SQL NULL) and ran queries that unnest or filter on that field.

What was the fix applied?

Replaced direct jsonb_array_elements(field) calls with:

jsonb_array_elements(CASE WHEN jsonb_typeof(field) = 'array' THEN field ELSE '[]'::jsonb END)

The new query looks like:

With 
table0 as (SELECT * from "entities_api"),
table1 as (SELECT * from table0 t0 LEFT JOIN LATERAL jsonb_array_elements(CASE WHEN jsonb_typeof("customAttribute"->'dev-ops-owner') = 'array' THEN "customAttribute"->'dev-ops-owner' ELSE '[]'::jsonb END) p1("customAttribute_dot_dev-ops-owner") on TRUE)
SELECT "customAttribute_dot_dev-ops-owner" AS "dev-ops-owner", COUNT(DISTINCT "id" ) AS "DISTINCTCOUNT_id" FROM table1 WHERE "tenantId" = ? AND "tenantId" = ? GROUP BY "customAttribute_dot_dev-ops-owner" OFFSET ? LIMIT ?

Testing

[X] Added integration tests

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules