Github user vrozov commented on a diff in the pull request:
https://github.com/apache/drill/pull/1224#discussion_r185351651
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/DrillConformance.java
---
@@ -0,0 +1,43 @@
+/*
+ * 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.
+ */
+package org.apache.drill.exec.planner.sql;
+
+import org.apache.calcite.sql.validate.SqlConformanceEnum;
+import org.apache.calcite.sql.validate.SqlDelegatingConformance;
+
+/**
+ * Drill's SQL conformance is SqlConformanceEnum.DEFAULT except for method
isApplyAllowed().
+ * Since Drill is going to allow OUTER APPLY and CROSS APPLY to allow each
row from left child of Join
+ * to join with output of right side (sub-query or table function that
will be invoked for each row).
+ * Refer to DRILL-5999 for more information.
+ */
+public class DrillConformance extends SqlDelegatingConformance {
--- End diff --
Why not to introduce top-level class when needed. To override the behavior
of the single method an anonymous class is more than sufficient.
---
