fix filter condition

Author: jamesfisher-geo

stac_fastapi/core/stac_fastapi/core/extensions/aggregation.py

@@ -447,6 +447,8 @@ async def aggregate(
                         status_code=400,
                         detail=f"Aggregation {agg_name} not supported at catalog level",
                     )
+
+        if aggregate_request.filter:
             try:
                 search = self.database.apply_cql2_filter(
                     search, aggregate_request.filter

stac_fastapi/tests/extensions/test_aggregation.py

@@ -176,6 +176,19 @@ async def test_aggregate_filter_extension_eq_post(app_client, ctx):
     assert resp.json()["aggregations"][0]["value"] == 1
 
 
+@pytest.mark.asyncio
+async def test_aggregate_filter_extension_neq_post(app_client, ctx):
+    params = {
+        "filter": {"op": "<>", "args": [{"property": "id"}, ctx.item["id"]]},
+        "filter-lang": "cql2-json",
+        "aggregations": ["total_count"],
+        "collections": [ctx.item["collection"]],
+    }
+    resp = await app_client.post("/aggregate", json=params)
+    assert resp.status_code == 200
+    assert resp.json()["aggregations"][0]["value"] == 0
+
+
 @pytest.mark.asyncio
 async def test_aggregate_extension_gte_get(app_client, ctx):
     # there's one item that can match, so one of these queries should match it and the other shouldn't