slinkydeveloper commented on a change in pull request #17522:
URL: https://github.com/apache/flink/pull/17522#discussion_r732007560



##########
File path: 
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/data/casting/CastExpression.java
##########
@@ -0,0 +1,56 @@
+/*
+ * 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.flink.table.data.casting;
+
+import org.apache.flink.table.types.logical.LogicalType;
+
+import java.util.Objects;
+
+/** Generated cast expression result. */

Review comment:
       Added some details.

##########
File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/data/casting/CastRulePredicate.java
##########
@@ -0,0 +1,147 @@
+/*
+ * 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.flink.table.data.casting;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.table.types.logical.LogicalType;
+import org.apache.flink.table.types.logical.LogicalTypeFamily;
+import org.apache.flink.table.types.logical.LogicalTypeRoot;
+
+import javax.annotation.Nullable;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.function.BiPredicate;
+
+/**
+ * In order to apply a {@link CastRule}, the runtime checks if a particular 
rule matches the tuple
+ * of input and target type using this class. In particular, a rule is applied 
if:
+ *
+ * <ol>
+ *   <li>{@link #getTargetTypes()} includes the {@link LogicalTypeRoot} of 
target type and either
+ *       <ol>
+ *         <li>{@link #getInputTypes()} includes the {@link LogicalTypeRoot} 
of input type or
+ *         <li>{@link #getInputTypeFamilies()} includes one of the {@link 
LogicalTypeFamily} of
+ *             input type
+ *       </ol>
+ *   <li>Or {@link #getTargetTypeFamilies()} includes one of the {@link 
LogicalTypeFamily} of target
+ *       type and either
+ *       <ol>
+ *         <li>{@link #getInputTypes()} includes the {@link LogicalTypeRoot} 
of input type or
+ *         <li>{@link #getInputTypeFamilies()} includes one of the {@link 
LogicalTypeFamily} of
+ *             input type
+ *       </ol>
+ *   <li>Or, if {@link #getCustomPredicate()} is not null, the input type and 
target type matches

Review comment:
       I tried to clarify it a bit, check it out now




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