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https://issues.apache.org/jira/browse/FLINK-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834191#comment-15834191
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ASF GitHub Bot commented on FLINK-5224:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3118#discussion_r97277454
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/TableFunctionCollector.scala
---
@@ -0,0 +1,81 @@
+/*
+ * 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.runtime
+
+import org.apache.flink.util.Collector
+
+/**
+ * The basic implementation of collector for
[[org.apache.calcite.schema.TableFunction]].
+ */
+abstract class TableFunctionCollector[T] extends Collector[T] {
+
+ var input: Any = _
+ var collector: Collector[_] = _
+ var collected: Boolean = _
+
+ /**
+ * Gets the input row from left table,
--- End diff --
`Sets`
> Improve UDTF: emit rows directly instead of buffering them
> ----------------------------------------------------------
>
> Key: FLINK-5224
> URL: https://issues.apache.org/jira/browse/FLINK-5224
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Jark Wu
> Assignee: Jark Wu
>
> This needs to code generate a `Collector` and register it into instance of
> {{TableFunction}}, and emit the rows generated by the UDTF directly instead
> of buffering them.
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