Compound filter targeting related indexed field errors

[AndrewSisley]

Querying with a compound (and/or) filter targeting related indexed field errors.

• This happens with or without data in the database.
• the compound operator can be either _and or _or, omitting the compound operator does not result in an error.
• The error occurs whether the index is unique or not.
• The kind of simple operator in the filter (e.g. _ilike, _eq, etc) does not appear to matter.

For example:

func TestFoo(t *testing.T) {
	test := testUtils.TestCase{
		Actions: []any{
			testUtils.SchemaUpdate{
				Schema: `
				  type Program {
					name: String
					certificationBodyOrg: Organization
				  }

				  type Organization {
					name: String @index
					programs: [Program]
				  }`,
			},
			testUtils.Request{
				Request: `query {
					Program(
					  filter: {
						_and: [
							{ certificationBodyOrg: { name: { _ilike: "%Test3%" } } }
						]
					  }
					) {
					  name
					}
				  }`,
				ExpectedError: "invalid filter operator is provided. Operator: _any",
			},
		},
	}

	testUtils.ExecuteTestCase(t, test)
}

Bug is hitting ln 661 and then 689 in indexer_iterators.go, func IndexFetcher.determineFieldFilterConditions(). That function does not appear to have been written with compound operators in mind. In the above test case ln 659 is hit, but ln 663 is not.