[GitHub] [beam] amaliujia commented on a change in pull request #10946: [BEAM-9363] TUMBLE as TVF

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amaliujia commented on a change in pull request #10946: [BEAM-9363] TUMBLE as TVF
URL: https://github.com/apache/beam/pull/10946#discussion_r408351446
 
 

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 File path: sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rel/BeamTableFunctionScanRel.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.beam.sdk.extensions.sql.impl.rel;
+
+import static org.apache.beam.vendor.calcite.v1_20_0.com.google.common.base.Preconditions.checkArgument;
+
+import java.lang.reflect.Type;
+import java.util.List;
+import java.util.Set;
+import org.apache.beam.sdk.extensions.sql.impl.planner.BeamCostModel;
+import org.apache.beam.sdk.extensions.sql.impl.planner.NodeStats;
+import org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils;
+import org.apache.beam.sdk.schemas.Schema;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.windowing.FixedWindows;
+import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PCollectionList;
+import org.apache.beam.sdk.values.Row;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptCluster;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptPlanner;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelTraitSet;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelNode;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.core.TableFunctionScan;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.metadata.RelColumnMapping;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.metadata.RelMetadataQuery;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.type.RelDataType;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexCall;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexInputRef;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexLiteral;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexNode;
+import org.joda.time.Duration;
+
+public class BeamTableFunctionScanRel extends TableFunctionScan implements BeamRelNode {
 
 Review comment:
   I agree your parameter.
   
   Given that only windowing TVF is the only TVF usage, having or not having a parameter does not matter, because I don't have a concrete idea what other table-valued function we will support and how.
   
   I would like to leave parametrization to the future when there is a need to support other TVF.  Either we limit windowing to `BeamWindowingTableFunctionScanRel` and have another Rel for other usage, or still have a general Rel but support all. It's not clear to me which approach is better, and that might can be answered when there is a need to support other  usage.
   
   Also to clarify: I do have a plan to support not only UDF, UDAF, but also user-defined tabled function, and that will happen in near term.

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