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[FLINK-4691] [table] Add group-windows for streaming tables to Table …
…API. This closes apache#2562.
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...k-libraries/flink-table/src/main/scala/org/apache/flink/api/java/table/groupWindows.scala
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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.flink.api.java.table | ||
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| import org.apache.flink.api.table.{SessionWindow, SlideWithSize, TumblingWindow} | ||
|
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| /** | ||
| * Helper class for creating a tumbling window. Tumbling windows are consecutive, non-overlapping | ||
| * windows of a specified fixed length. For example, a tumbling window of 5 minutes size groups | ||
| * elements in 5 minutes intervals. | ||
| */ | ||
| object Tumble { | ||
|
|
||
| /** | ||
| * Creates a tumbling window. Tumbling windows are consecutive, non-overlapping | ||
| * windows of a specified fixed length. For example, a tumbling window of 5 minutes size groups | ||
| * elements in 5 minutes intervals. | ||
| * | ||
| * @param size the size of the window as time or row-count interval. | ||
| * @return a tumbling window | ||
| */ | ||
| def over(size: String): TumblingWindow = new TumblingWindow(size) | ||
| } | ||
|
|
||
| /** | ||
| * Helper class for creating a sliding window. Sliding windows have a fixed size and slide by | ||
| * a specified slide interval. If the slide interval is smaller than the window size, sliding | ||
| * windows are overlapping. Thus, an element can be assigned to multiple windows. | ||
| * | ||
| * For example, a sliding window of size 15 minutes with 5 minutes sliding interval groups elements | ||
| * of 15 minutes and evaluates every five minutes. Each element is contained in three consecutive | ||
| * window evaluations. | ||
| */ | ||
| object Slide { | ||
|
|
||
| /** | ||
| * Creates a sliding window. Sliding windows have a fixed size and slide by | ||
| * a specified slide interval. If the slide interval is smaller than the window size, sliding | ||
| * windows are overlapping. Thus, an element can be assigned to multiple windows. | ||
| * | ||
| * For example, a sliding window of size 15 minutes with 5 minutes sliding interval groups | ||
| * elements of 15 minutes and evaluates every five minutes. Each element is contained in three | ||
| * consecutive window evaluations. | ||
| * | ||
| * @param size the size of the window as time or row-count interval | ||
| * @return a partially specified sliding window | ||
| */ | ||
| def over(size: String): SlideWithSize = new SlideWithSize(size) | ||
| } | ||
|
|
||
| /** | ||
| * Helper class for creating a session window. The boundary of session windows are defined by | ||
| * intervals of inactivity, i.e., a session window is closes if no event appears for a defined | ||
| * gap period. | ||
| */ | ||
| object Session { | ||
|
|
||
| /** | ||
| * Creates a session window. The boundary of session windows are defined by | ||
| * intervals of inactivity, i.e., a session window is closes if no event appears for a defined | ||
| * gap period. | ||
| * | ||
| * @param gap specifies how long (as interval of milliseconds) to wait for new data before | ||
| * closing the session window. | ||
| * @return a session window | ||
| */ | ||
| def withGap(gap: String): SessionWindow = new SessionWindow(gap) | ||
| } |
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85 changes: 85 additions & 0 deletions
85
...-libraries/flink-table/src/main/scala/org/apache/flink/api/scala/table/groupWindows.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /* | ||
| * 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.api.scala.table | ||
|
|
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| import org.apache.flink.api.table.expressions.Expression | ||
| import org.apache.flink.api.table.{SessionWindow, SlideWithSize, TumblingWindow} | ||
|
|
||
| /** | ||
| * Helper object for creating a tumbling window. Tumbling windows are consecutive, non-overlapping | ||
| * windows of a specified fixed length. For example, a tumbling window of 5 minutes size groups | ||
| * elements in 5 minutes intervals. | ||
| */ | ||
| object Tumble { | ||
|
|
||
| /** | ||
| * Creates a tumbling window. Tumbling windows are fixed-size, consecutive, non-overlapping | ||
| * windows. For example, a tumbling window of 5 minutes size groups | ||
| * elements in 5 minutes intervals. | ||
| * | ||
| * @param size the size of the window as time or row-count interval. | ||
| * @return a tumbling window | ||
| */ | ||
| def over(size: Expression): TumblingWindow = new TumblingWindow(size) | ||
| } | ||
|
|
||
| /** | ||
| * Helper object for creating a sliding window. Sliding windows have a fixed size and slide by | ||
| * a specified slide interval. If the slide interval is smaller than the window size, sliding | ||
| * windows are overlapping. Thus, an element can be assigned to multiple windows. | ||
| * | ||
| * For example, a sliding window of size 15 minutes with 5 minutes sliding interval groups elements | ||
| * of 15 minutes and evaluates every five minutes. Each element is contained in three consecutive | ||
| * window evaluations. | ||
| */ | ||
| object Slide { | ||
|
|
||
| /** | ||
| * Creates a sliding window. Sliding windows have a fixed size and slide by | ||
| * a specified slide interval. If the slide interval is smaller than the window size, sliding | ||
| * windows are overlapping. Thus, an element can be assigned to multiple windows. | ||
| * | ||
| * For example, a sliding window of size 15 minutes with 5 minutes sliding interval groups | ||
| * elements of 15 minutes and evaluates every five minutes. Each element is contained in three | ||
| * consecutive | ||
| * | ||
| * @param size the size of the window as time or row-count interval | ||
| * @return a partially specified sliding window | ||
| */ | ||
| def over(size: Expression): SlideWithSize = new SlideWithSize(size) | ||
| } | ||
|
|
||
| /** | ||
| * Helper object for creating a session window. The boundary of session windows are defined by | ||
| * intervals of inactivity, i.e., a session window is closes if no event appears for a defined | ||
| * gap period. | ||
| */ | ||
| object Session { | ||
|
|
||
| /** | ||
| * Creates a session window. The boundary of session windows are defined by | ||
| * intervals of inactivity, i.e., a session window is closes if no event appears for a defined | ||
| * gap period. | ||
| * | ||
| * @param gap specifies how long (as interval of milliseconds) to wait for new data before | ||
| * closing the session window. | ||
| * @return a session window | ||
| */ | ||
| def withGap(gap: Expression): SessionWindow = new SessionWindow(gap) | ||
| } |
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