[GitHub] [flink] JingsongLi commented on a change in pull request #11034: [FLINK-15802][table] Support new type inference for table functions

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JingsongLi commented on a change in pull request #11034: [FLINK-15802][table] Support new type inference for table functions
URL: https://github.com/apache/flink/pull/11034#discussion_r376197098
 
 

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 File path: flink-table/flink-table-planner-blink/src/main/java/org/apache/calcite/sql/validate/ProcedureNamespace.java
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+/*
+ * 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.calcite.sql.validate;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.table.planner.functions.utils.TableSqlFunction;
+
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.sql.SqlCall;
+import org.apache.calcite.sql.SqlCallBinding;
+import org.apache.calcite.sql.SqlKind;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.calcite.sql.SqlOperator;
+import org.apache.calcite.sql.SqlUtil;
+import org.apache.calcite.sql.type.SqlTypeName;
+
+/**
+ * Namespace whose contents are defined by the result of a call to a user-defined procedure.
+ *
+ * <p>Note: Compared to Calcite, this class implements custom logic for dealing with collection tables
+ * like {@code TABLE(function(...))} procedures. Compared to the SQL standard, Flink's table functions
 
 Review comment:
   I don't quite understand `TABLE(function(...))`, it seems only `TABLE(function(literals))` support? Is this useful?

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