Move optimizer integration tests to core_integration

datafusion/core/tests/core_integration.rs

@@ -36,6 +36,12 @@ mod memory_limit;
 /// Run all tests that are found in the `custom_sources_cases` directory
 mod custom_sources_cases;
 
+/// Run all tests that are found in the `optimizer` directory
+mod optimizer;
+
+/// Run all tests that are found in the `physical_optimizer` directory
+mod physical_optimizer;
+
 #[cfg(test)]
 #[ctor::ctor]
 fn init() {

datafusion/core/tests/physical_optimizer/mod.rs

@@ -0,0 +1,18 @@
+// 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.
+
+mod aggregate_statistics;

datafusion/physical-optimizer/src/aggregate_statistics.rs

@@ -296,3 +296,5 @@ fn is_max(agg_expr: &dyn AggregateExpr) -> bool {
     }
     false
 }
+
+// See tests in datafusion/core/tests/physical_optimizer