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[FLINK-11068][table] Convert the API classes of *Table to interfaces
This closes apache#8006
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69 changes: 69 additions & 0 deletions
69
...ble/flink-table-api-java/src/main/java/org/apache/flink/table/api/GroupWindowedTable.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| * 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:https://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. | ||
| */ | ||
|
|
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| package org.apache.flink.table.api; | ||
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| import org.apache.flink.annotation.PublicEvolving; | ||
| import org.apache.flink.table.expressions.Expression; | ||
|
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| /** | ||
| * A table that has been windowed for {@link GroupWindow}s. | ||
| */ | ||
| @PublicEvolving | ||
| public interface GroupWindowedTable { | ||
|
|
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| /** | ||
| * Groups the elements by a mandatory window and one or more optional grouping attributes. | ||
| * The window is specified by referring to its alias. | ||
| * | ||
| * <p>If no additional grouping attribute is specified and if the input is a streaming table, | ||
| * the aggregation will be performed by a single task, i.e., with parallelism 1. | ||
| * | ||
| * <p>Aggregations are performed per group and defined by a subsequent {@code select(...)} | ||
| * clause similar to SQL SELECT-GROUP-BY query. | ||
| * | ||
| * <p>Example: | ||
| * | ||
| * <pre> | ||
| * {code | ||
| * tab.window([groupWindow].as("w")).groupBy("w, key").select("key, value.avg") | ||
| * } | ||
| * </pre> | ||
| */ | ||
| WindowGroupedTable groupBy(String fields); | ||
|
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| /** | ||
| * Groups the elements by a mandatory window and one or more optional grouping attributes. | ||
| * The window is specified by referring to its alias. | ||
| * | ||
| * <p>If no additional grouping attribute is specified and if the input is a streaming table, | ||
| * the aggregation will be performed by a single task, i.e., with parallelism 1. | ||
| * | ||
| * <p>Aggregations are performed per group and defined by a subsequent {@code select(...)} | ||
| * clause similar to SQL SELECT-GROUP-BY query. | ||
| * | ||
| * <p>Scala Example: | ||
| * | ||
| * <pre> | ||
| * {code | ||
| * tab.window([groupWindow] as 'w)).groupBy('w, 'key).select('key, 'value.avg) | ||
| * } | ||
| * </pre> | ||
| */ | ||
| WindowGroupedTable groupBy(Expression... fields); | ||
| } |
57 changes: 57 additions & 0 deletions
57
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/GroupedTable.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* | ||
| * 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:https://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. | ||
| */ | ||
|
|
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| package org.apache.flink.table.api; | ||
|
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| import org.apache.flink.annotation.PublicEvolving; | ||
| import org.apache.flink.table.expressions.Expression; | ||
|
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| /** | ||
| * A table that has been grouped on a set of grouping keys. | ||
| */ | ||
| @PublicEvolving | ||
| public interface GroupedTable { | ||
|
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| /** | ||
| * Performs a selection operation on a grouped table. Similar to an SQL SELECT statement. | ||
| * The field expressions can contain complex expressions and aggregations. | ||
| * | ||
| * <p>Example: | ||
| * | ||
| * <pre> | ||
| * {@code | ||
| * tab.groupBy("key").select("key, value.avg + ' The average' as average") | ||
| * } | ||
| * </pre> | ||
| */ | ||
| Table select(String fields); | ||
|
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| /** | ||
| * Performs a selection operation on a grouped table. Similar to an SQL SELECT statement. | ||
| * The field expressions can contain complex expressions and aggregations. | ||
| * | ||
| * <p>Scala Example: | ||
| * | ||
| * <pre> | ||
| * {@code | ||
| * tab.groupBy('key).select('key, 'value.avg + " The average" as 'average) | ||
| * } | ||
| * </pre> | ||
| */ | ||
| Table select(Expression... fields); | ||
| } |
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