feat: Add week time grain for Elasticsearch datasets (apache#25683)

Co-authored-by: Mikel Vuka <[email protected]>

superset/db_engine_specs/elasticsearch.py

@@ -46,6 +46,7 @@ class ElasticSearchEngineSpec(BaseEngineSpec):  # pylint: disable=abstract-metho
         TimeGrain.MINUTE: "HISTOGRAM({col}, INTERVAL 1 MINUTE)",
         TimeGrain.HOUR: "HISTOGRAM({col}, INTERVAL 1 HOUR)",
         TimeGrain.DAY: "HISTOGRAM({col}, INTERVAL 1 DAY)",
+        TimeGrain.WEEK: "DATE_TRUNC('week', {col})",
         TimeGrain.MONTH: "HISTOGRAM({col}, INTERVAL 1 MONTH)",
         TimeGrain.YEAR: "HISTOGRAM({col}, INTERVAL 1 YEAR)",
     }

tests/integration_tests/db_engine_specs/elasticsearch_tests.py

@@ -0,0 +1,40 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from sqlalchemy import column
+
+from superset.db_engine_specs.elasticsearch import ElasticSearchEngineSpec
+from tests.integration_tests.db_engine_specs.base_tests import TestDbEngineSpec
+
+
+class TestElasticsearchDbEngineSpec(TestDbEngineSpec):
+    def test_time_grain_week_expression(self):
+        col = column("ts")
+        col.type = "datetime"
+        expected_time_grain_expression = "DATE_TRUNC('week', ts)"
+        actual = ElasticSearchEngineSpec.get_timestamp_expr(
+            col=col, pdf=None, time_grain="P1W"
+        )
+        self.assertEqual(str(actual), expected_time_grain_expression)
+
+    def test_time_grain_hour_expression(self):
+        col = column("ts")
+        col.type = "datetime"
+        expected_time_grain_expression = "HISTOGRAM(ts, INTERVAL 1 HOUR)"
+        actual = ElasticSearchEngineSpec.get_timestamp_expr(
+            col=col, pdf=None, time_grain="PT1H"
+        )
+        self.assertEqual(str(actual), expected_time_grain_expression)