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https://issues.apache.org/jira/browse/FLINK-10487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16641702#comment-16641702
]
ASF GitHub Bot commented on FLINK-10487:
----------------------------------------
asfgit closed pull request #6790: [FLINK-10487] [table] fix invalid Flink SQL
example and add runnable SQL example for Java API
URL: https://github.com/apache/flink/pull/6790
This is a PR merged from a forked repository.
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diff --git a/docs/dev/table/sql.md b/docs/dev/table/sql.md
index a9fd94f10d5..9b9b40d4081 100644
--- a/docs/dev/table/sql.md
+++ b/docs/dev/table/sql.md
@@ -48,7 +48,7 @@ StreamTableEnvironment tableEnv =
TableEnvironment.getTableEnvironment(env);
DataStream<Tuple3<Long, String, Integer>> ds = env.addSource(...);
// SQL query with an inlined (unregistered) table
-Table table = tableEnv.toTable(ds, "user, product, amount");
+Table table = tableEnv.fromDataStream(ds, "user, product, amount");
Table result = tableEnv.sqlQuery(
"SELECT SUM(amount) FROM " + table + " WHERE product LIKE '%Rubber%'");
diff --git
a/flink-examples/flink-examples-table/src/main/java/org/apache/flink/table/examples/java/StreamSQLExample.java
b/flink-examples/flink-examples-table/src/main/java/org/apache/flink/table/examples/java/StreamSQLExample.java
new file mode 100644
index 00000000000..99e79a8a8cb
--- /dev/null
+++
b/flink-examples/flink-examples-table/src/main/java/org/apache/flink/table/examples/java/StreamSQLExample.java
@@ -0,0 +1,104 @@
+/*
+ * 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.examples.java;
+
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.table.api.Table;
+import org.apache.flink.table.api.TableEnvironment;
+import org.apache.flink.table.api.java.StreamTableEnvironment;
+
+import java.util.Arrays;
+
+/**
+ * Simple example for demonstrating the use of SQL on a Stream Table in Java.
+ *
+ * <p>This example shows how to:
+ * - Convert DataStreams to Tables
+ * - Register a Table under a name
+ * - Run a StreamSQL query on the registered Table
+ *
+ */
+public class StreamSQLExample {
+
+ //
*************************************************************************
+ // PROGRAM
+ //
*************************************************************************
+
+ public static void main(String[] args) throws Exception {
+
+ // set up execution environment
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ StreamTableEnvironment tEnv =
TableEnvironment.getTableEnvironment(env);
+
+ DataStream<Order> orderA = env.fromCollection(Arrays.asList(
+ new Order(1L, "beer", 3),
+ new Order(1L, "diaper", 4),
+ new Order(3L, "rubber", 2)));
+
+ DataStream<Order> orderB = env.fromCollection(Arrays.asList(
+ new Order(2L, "pen", 3),
+ new Order(2L, "rubber", 3),
+ new Order(4L, "beer", 1)));
+
+ // convert DataStream to Table
+ Table tableA = tEnv.fromDataStream(orderA, "user, product,
amount");
+ // register DataStream as Table
+ tEnv.registerDataStream("OrderB", orderB, "user, product,
amount");
+
+ // union the two tables
+ Table result = tEnv.sqlQuery("SELECT * FROM " + tableA + "
WHERE amount > 2 UNION ALL " +
+ "SELECT * FROM OrderB WHERE
amount < 2");
+
+ tEnv.toAppendStream(result, Order.class).print();
+
+ env.execute();
+ }
+
+ //
*************************************************************************
+ // USER DATA TYPES
+ //
*************************************************************************
+
+ /**
+ * Simple POJO.
+ */
+ public static class Order {
+ public Long user;
+ public String product;
+ public int amount;
+
+ public Order() {
+ }
+
+ public Order(Long user, String product, int amount) {
+ this.user = user;
+ this.product = product;
+ this.amount = amount;
+ }
+
+ @Override
+ public String toString() {
+ return "Order{" +
+ "user=" + user +
+ ", product='" + product + '\'' +
+ ", amount=" + amount +
+ '}';
+ }
+ }
+}
diff --git
a/flink-examples/flink-examples-table/src/main/scala/org/apache/flink/table/examples/scala/StreamSQLExample.scala
b/flink-examples/flink-examples-table/src/main/scala/org/apache/flink/table/examples/scala/StreamSQLExample.scala
index 3297aec418d..77db33dc861 100644
---
a/flink-examples/flink-examples-table/src/main/scala/org/apache/flink/table/examples/scala/StreamSQLExample.scala
+++
b/flink-examples/flink-examples-table/src/main/scala/org/apache/flink/table/examples/scala/StreamSQLExample.scala
@@ -23,7 +23,7 @@ import org.apache.flink.table.api.TableEnvironment
import org.apache.flink.table.api.scala._
/**
- * Simple example for demonstrating the use of SQL on a Stream Table.
+ * Simple example for demonstrating the use of SQL on a Stream Table in Scala.
*
* This example shows how to:
* - Convert DataStreams to Tables
@@ -53,13 +53,14 @@ object StreamSQLExample {
Order(2L, "rubber", 3),
Order(4L, "beer", 1)))
- // register the DataStreams under the name "OrderA" and "OrderB"
- tEnv.registerDataStream("OrderA", orderA, 'user, 'product, 'amount)
+ // convert DataStream to Table
+ var tableA = tEnv.fromDataStream(orderA, 'user, 'product, 'amount)
+ // register DataStream as Table
tEnv.registerDataStream("OrderB", orderB, 'user, 'product, 'amount)
// union the two tables
val result = tEnv.sqlQuery(
- "SELECT * FROM OrderA WHERE amount > 2 UNION ALL " +
+ s"SELECT * FROM $tableA WHERE amount > 2 UNION ALL " +
"SELECT * FROM OrderB WHERE amount < 2")
result.toAppendStream[Order].print()
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> fix invalid Flink SQL example
> -----------------------------
>
> Key: FLINK-10487
> URL: https://issues.apache.org/jira/browse/FLINK-10487
> Project: Flink
> Issue Type: Bug
> Components: Documentation, Table API & SQL
> Affects Versions: 1.6.0, 1.6.1, 1.7.0
> Reporter: Bowen Li
> Assignee: Bowen Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.0
>
>
> On https://ci.apache.org/projects/flink/flink-docs-master/dev/table/sql.html
> , the example is :
> {code:java}
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> StreamTableEnvironment tableEnv = TableEnvironment.getTableEnvironment(env);
> // ingest a DataStream from an external source
> DataStream<Tuple3<Long, String, Integer>> ds = env.addSource(...);
> // SQL query with an inlined (unregistered) table
> Table table = tableEnv.toTable(ds, "user, product, amount");
> Table result = tableEnv.sqlQuery(
> "SELECT SUM(amount) FROM " + table + " WHERE product LIKE '%Rubber%'");
> ...
> {code}
> But there's no API of {{toTable()}} in StreamTableEnvironment
> cc [~fhueske]
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