fix(core): introduce DATE_DIFF function

ibis-server/resources/function_list/bigquery.csv

@@ -11,6 +11,7 @@ scalar,current_timestamp,timestamptz,,"","Returns current timestamp."
 scalar,date_add,date,,"date,int64","Adds a number of day to a date."
 scalar,date_sub,date,,"date,interval","Subtracts a specified interval from a date."
 scalar,date_diff,int64,,"date,date,granularity","Returns the difference between two dates."
+scalar,datediff,int64,,"date,date,granularity","Returns the difference between two dates."
 scalar,timestamp_add,timestamp,,"timestamp,granularity","Adds a specified interval to a timestamp."
 scalar,timestamp_sub,timestamp,,"timestamp,granularity","Subtracts a specified interval from a timestamp."
 scalar,timestamp_diff,int64,,"timestamp,timestamp,granularity","Returns the difference between two timestamps."

ibis-server/resources/white_function_list/bigquery.csv

@@ -10,6 +10,7 @@ scalar,current_datetime,timestamp,,"","Returns current date and time."
 scalar,date_add,date,,"date,int64","Adds a number of day to a date."
 scalar,date_sub,date,,"date,interval","Subtracts a specified interval from a date."
 scalar,date_diff,int64,,"date,date,granularity","Returns the difference between two dates."
+scalar,datediff,int64,,"date,date,granularity","Returns the difference between two dates."
 scalar,timestamp_add,timestamp,,"timestamp,granularity","Adds a specified interval to a timestamp."
 scalar,timestamp_sub,timestamp,,"timestamp,granularity","Subtracts a specified interval from a timestamp."
 scalar,timestamp_diff,int64,,"timestamp,timestamp,granularity","Returns the difference between two timestamps."

ibis-server/tests/conftest.py

@@ -11,7 +11,7 @@ def file_path(path: str) -> str:
     return os.path.join(os.path.dirname(__file__), path)
 
 
-DATAFUSION_FUNCTION_COUNT = 283
+DATAFUSION_FUNCTION_COUNT = 285
 
 
 @pytest.fixture(scope="session")

ibis-server/tests/routers/v3/connector/bigquery/test_functions.py

@@ -25,6 +25,7 @@
             },
             "columns": [
                 {"name": "o_orderkey", "type": "integer"},
+                {"name": "o_orderdate", "type": "date"},
             ],
         },
     ],
@@ -52,7 +53,7 @@ async def test_function_list(client):
     response = await client.get(url=f"{base_url}/functions")
     assert response.status_code == 200
     result = response.json()
-    assert len(result) == 175
+    assert len(result) == 176
     the_func = next(
         filter(
             lambda x: x["name"] == "string_agg",
@@ -160,3 +161,85 @@ async def test_datetime_function(client, manifest_str: str, connection_info):
         "data": [["2001-01-01 00:11:11.000000"]],
         "dtypes": {"col": "timestamp[us]"},
     }
+
+
+async def test_date_diff_function(client, manifest_str: str, connection_info):
+    response = await client.post(
+        url=f"{base_url}/query",
+        json={
+            "connectionInfo": connection_info,
+            "manifestStr": manifest_str,
+            "sql": "SELECT DATE_DIFF(DAY, CURRENT_DATE(), o_orderdate) AS col FROM orders LIMIT 1",
+        },
+    )
+
+    assert response.status_code == 200
+    result = response.json()
+    assert result == {
+        "columns": ["col"],
+        "data": [[result["data"][0][0]]],
+        "dtypes": {"col": "int64"},
+    }
+
+    response = await client.post(
+        url=f"{base_url}/query",
+        json={
+            "connectionInfo": connection_info,
+            "manifestStr": manifest_str,
+            "sql": "SELECT DATEDIFF(DAY, CURRENT_DATE(), o_orderdate) AS col FROM orders LIMIT 1",
+        },
+    )
+
+    assert response.status_code == 200
+    result = response.json()
+    assert result == {
+        "columns": ["col"],
+        "data": [[result["data"][0][0]]],
+        "dtypes": {"col": "int64"},
+    }
+
+    response = await client.post(
+        url=f"{base_url}/query",
+        json={
+            "connectionInfo": connection_info,
+            "manifestStr": manifest_str,
+            "sql": "SELECT DATEDIFF('DAY', CURRENT_DATE(), o_orderdate) AS col FROM orders LIMIT 1",
+        },
+    )
+
+    assert response.status_code == 200
+    result = response.json()
+    assert result == {
+        "columns": ["col"],
+        "data": [[result["data"][0][0]]],
+        "dtypes": {"col": "int64"},
+    }
+
+    response = await client.post(
+        url=f"{base_url}/query",
+        json={
+            "connectionInfo": connection_info,
+            "manifestStr": manifest_str,
+            "sql": "SELECT DATEDIFF('DAYS', CURRENT_DATE(), o_orderdate) AS col FROM orders LIMIT 1",
+        },
+    )
+
+    assert response.status_code == 422
+    assert "Unsupported date part 'DAYS' for BIGQUERY." in response.text
+
+    response = await client.post(
+        url=f"{base_url}/query",
+        json={
+            "connectionInfo": connection_info,
+            "manifestStr": manifest_str,
+            "sql": "SELECT DATEDIFF('HOUR', CURRENT_TIMESTAMP(), TIMESTAMP WITH TIME ZONE '2025-01-01 00:00:00') AS col FROM orders LIMIT 1",
+        },
+    )
+
+    assert response.status_code == 200
+    result = response.json()
+    assert result == {
+        "columns": ["col"],
+        "data": [[result["data"][0][0]]],
+        "dtypes": {"col": "int64"},
+    }

ibis-server/tests/routers/v3/connector/local_file/test_functions.py

@@ -54,7 +54,7 @@ async def test_function_list(client):
     assert response.status_code == 200
     result = response.json()
     # 429 is the number of functions in `resources/function_list/duckdb.csv` file excluded the default functions in DataFusion.
-    assert len(result) == DATAFUSION_FUNCTION_COUNT + 427
+    assert len(result) == DATAFUSION_FUNCTION_COUNT + 425
     the_func = next(filter(lambda x: x["name"] == "regexp_escape", result))
     assert the_func == {
         "name": "regexp_escape",