rezarokni commented on a change in pull request #12097:
URL: https://github.com/apache/beam/pull/12097#discussion_r446764890
##########
File path:
examples/java/src/main/java/org/apache/beam/examples/snippets/Snippets.java
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@@ -914,4 +917,71 @@ public void process(ProcessContext c) {
return result;
}
}
+
+ public static class SchemaJoinPattern {
+ public static PCollection<String> main(
+ Pipeline p,
+ final List<Row> emailUsers,
+ final List<Row> phoneUsers,
+ Schema emailSchema,
+ Schema phoneSchema) {
+ // [START SchemaJoinPatternJoin]
+ // Create/Read Schema PCollections
+ PCollection<Row> emailList =
+ p.apply("CreateEmails",
Create.of(emailUsers).withRowSchema(emailSchema));
+
+ PCollection<Row> phoneList =
+ p.apply("CreatePhones",
Create.of(phoneUsers).withRowSchema(phoneSchema));
+
+ // Perform Join
+ PCollection<Row> resultRow =
+ emailList.apply("Apply Join", Join.<Row,
Row>innerJoin(phoneList).using("name"));
+
+ // Preview Result
+ resultRow.apply(
+ "Preview Result",
+ MapElements.into(TypeDescriptors.strings())
+ .via(
+ x -> {
+ System.out.println(x);
+ return "";
+ }));
+
+ /* Sample Output From the pipeline:
Review comment:
As this class is abstracted, the sample output can be difficult to tie
back as the data is not in this snippet but later on. Consider if inline will
be easier to follow for the example.
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