[Data Connect] Full-text search relevance not working as expected

[Amaimaya]

[REQUIRED] Environment info

firebase-tools: I used the console

Platform: macOS

[REQUIRED] Test case

Create the following table:

type Book @table(key: ["id"]) {
  id: String!
  title: String! @searchable
}

Mock Data:

id: "1", title: "Large book"

id: "2", title: "large_book_3"

id: "3", title: "large-book-4"

id: "4", title: "small-book"

Then query the titles this way:

query getBooks($search: String) {
  books_search(
    query: $search
  ) {
    id
    title
    _metadata {
      relevance
    }
  }
}

[REQUIRED] Steps to reproduce

1. Deploy the schema above to a Firebase Data Connect instance.
2. Insert the four "book" records listed in the test case.
3. Execute the getBooks query using the search string: "Large book".
4. Observe the _metadata.relevance field for all returned records.

[REQUIRED] Expected behavior

The record with the title "Large book" should have a higher relevance score than "large_book_3" or "large-book-4" because it is an exact case-insensitive match.

[REQUIRED] Actual behavior

All matching records return the exact same relevance value, making it impossible to rank results by quality.