API: meta contains query does not work

[QuantumDancer]

Querying records that contain a given meta value does not work. MWE:

from pyauditor import AuditorClientBuilder, MetaOperator, MetaQuery, QueryBuilder, Record, Meta, Score, Component
import datetime

def add_records(site_id, client):
    for i in range(0, 24):
        record_id = f"record-{i:02d}-{site_id}"

        start = datetime.datetime(2022, 10, 8, i, 0, 0, 0, tzinfo=datetime.timezone.utc)
        stop = datetime.datetime(2022, 10, 9, i, 0, 0, 0, tzinfo=datetime.timezone.utc)
        meta = (
            Meta()
            .insert("site_id", [site_id])
            .insert("group_id", ["group_1"])
            .insert("nodes", ["node1", "node2"])
        )
        score1 = Score("HEPSPEC", 1.0)
        component1 = Component("comp-1", 10).with_score(score1)

        record = (
            Record(record_id, start)
            .with_stop_time(stop)
            .with_meta(meta)
            .with_component(component1)
        )

        client.add(record)


builder = AuditorClientBuilder()
builder = builder.address("127.0.0.1", 8000)
client = builder.build_blocking()

add_records("site_A", client)
add_records("site_B", client)

meta_operator = MetaOperator().contains("site_B")
meta_query = MetaQuery().meta_operator("site_id", meta_operator)
query_string = QueryBuilder().with_meta_query(meta_query).build()
print(query_string)
records = client.advanced_query(query_string)

print(len(records))

This returns 48, but it should return 24.

We didn't catch this in our unit/integration tests, because we only test the meta contains operator only if there is one unique value in the meta key:

• https://github.com/alu-schumacher/AUDITOR/blob/main/auditor/tests/api/advanced_queries.rs#L290
• https://github.com/alu-schumacher/AUDITOR/blob/main/pyauditor/scripts/test_advanced_query.py

Instead, we should create records with different values for a meta entry and then check if we select a subset of records.

Originally reported by @dirksammel

[QuantumDancer]

Closed by #645