Skip to content

[BEAM-2749] update BeamSqlExample #3706

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
mingmxu wants to merge 1 commit into from
Closed

[BEAM-2749] update BeamSqlExample #3706

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
24 changes: 15 additions & 9 deletions ...tensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/example/BeamSqlExample.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -39,11 +39,10 @@
*
* <p>Run the example with
* <pre>
* mvn -pl dsls/sql compile exec:java \
* -Dexec.mainClass=BeamSqlExample \
* mvn -pl sdks/java/extensions/sql \
* compile exec:java -Dexec.mainClass=org.apache.beam.sdk.extensions.sql.example.BeamSqlExample \
* -Dexec.args="--runner=DirectRunner" -Pdirect-runner
* </pre>
*
*/
class BeamSqlExample {
public static void main(String[] args) throws Exception {
Expand All @@ -54,36 +53,43 @@ public static void main(String[] args) throws Exception {
List<String> fieldNames = Arrays.asList("c1", "c2", "c3");
List<Integer> fieldTypes = Arrays.asList(Types.INTEGER, Types.VARCHAR, Types.DOUBLE);
BeamRecordSqlType type = BeamRecordSqlType.create(fieldNames, fieldTypes);
BeamRecord row = new BeamRecord(type, 1, "row", 1.0);
BeamRecord row1 = new BeamRecord(type, Arrays.<Object>asList(1, "row", 1.0));
BeamRecord row2 = new BeamRecord(type, Arrays.<Object>asList(2, "row", 2.0));
BeamRecord row3 = new BeamRecord(type, Arrays.<Object>asList(3, "row", 3.0));

//create a source PCollection with Create.of();
PCollection<BeamRecord> inputTable = PBegin.in(p).apply(Create.of(row)
PCollection<BeamRecord> inputTable = PBegin.in(p).apply(Create.of(row1, row2, row3)
.withCoder(type.getRecordCoder()));

//Case 1. run a simple SQL query over input PCollection with BeamSql.simpleQuery;
PCollection<BeamRecord> outputStream = inputTable.apply(
BeamSql.simpleQuery("select c1, c2, c3 from PCOLLECTION where c1=1"));
BeamSql.simpleQuery("select c1, c2, c3 from PCOLLECTION where c1 > 1"));

//print the output record of case 1;
outputStream.apply("log_result",
MapElements.<BeamRecord, Void>via(new SimpleFunction<BeamRecord, Void>() {
public Void apply(BeamRecord input) {
System.out.println("PCOLLECTION: " + input);
//expect output:
// PCOLLECTION: [3, row, 3.0]
// PCOLLECTION: [2, row, 2.0]
System.out.println("PCOLLECTION: " + input.getDataValues());
return null;
}
}));

//Case 2. run the query with BeamSql.query over result PCollection of case 1.
PCollection<BeamRecord> outputStream2 =
PCollectionTuple.of(new TupleTag<BeamRecord>("CASE1_RESULT"), outputStream)
.apply(BeamSql.query("select c2, c3 from CASE1_RESULT where c1=1"));
.apply(BeamSql.query("select c2, sum(c3) from CASE1_RESULT group by c2"));

//print the output record of case 2;
outputStream2.apply("log_result",
MapElements.<BeamRecord, Void>via(new SimpleFunction<BeamRecord, Void>() {
@Override
public Void apply(BeamRecord input) {
System.out.println("TABLE_B: " + input);
//expect output:
// CASE1_RESULT: [row, 5.0]
System.out.println("CASE1_RESULT: " + input.getDataValues());
return null;
}
}));
Expand Down