Skip to content
Permalink
Browse files
feat: new sample - Query: Clustered Table (#121)
* feat: new sample - Query: Clustered Table

* update base on comments, refactoring
  • Loading branch information
stephaniewang526 committed Jan 23, 2020
1 parent 93f6cc2 commit df59cc70c9507bf65781118a1938e5fd4701bb83
@@ -50,8 +50,8 @@ public static void createPartitionedTable(String datasetName, String tableName)
Schema schema =
Schema.of(
Field.of("stringField", StandardSQLTypeName.STRING),
Field.of("booleanField", StandardSQLTypeName.BOOL));
Field.of("dateField", StandardSQLTypeName.DATE);
Field.of("booleanField", StandardSQLTypeName.BOOL),
Field.of("dateField", StandardSQLTypeName.DATE));

StandardTableDefinition tableDefinition =
StandardTableDefinition.newBuilder()
@@ -0,0 +1,66 @@
/*
* Copyright 2020 Google LLC
*
* Licensed 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 com.example.bigquery;

// [START bigquery_query_clustered_table]
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.QueryJobConfiguration;
import com.google.cloud.bigquery.TableResult;

public class QueryClusteredTable {

public static void runQueryClusteredTable() throws Exception {
// TODO(developer): Replace these variables before running the sample.
String projectId = "MY_PROJECT_ID";
String datasetName = "MY_DATASET_NAME";
String tableName = "MY_TABLE_NAME";
queryClusteredTable(projectId, datasetName, tableName);
}

public static void queryClusteredTable(String projectId, String datasetName, String tableName) {
try {
// Initialize client that will be used to send requests. This client only needs to be created
// once, and can be reused for multiple requests.
BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

String sourceTable = "`" + projectId + "." + datasetName + "." + tableName + "`";
String query =
"SELECT word, word_count\n"
+ "FROM "
+ sourceTable
+ "\n"
// Optimize query performance by filtering the clustered columns in sort order
+ "WHERE corpus = 'romeoandjuliet'\n"
+ "AND word_count >= 1";

QueryJobConfiguration queryConfig = QueryJobConfiguration.newBuilder(query).build();

TableResult results = bigquery.query(queryConfig);

results
.iterateAll()
.forEach(row -> row.forEach(val -> System.out.printf("%s,", val.toString())));

System.out.println("Query clustered table performed successfully.");
} catch (BigQueryException | InterruptedException e) {
System.out.println("Query not performed \n" + e.toString());
}
}
}
// [END bigquery_query_clustered_table]
@@ -0,0 +1,52 @@
/*
* Copyright 2020 Google LLC
*
* Licensed 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 com.example.bigquery;

import static com.google.common.truth.Truth.assertThat;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class QueryClusteredTableIT {
private ByteArrayOutputStream bout;
private PrintStream out;

@Before
public void setUp() {
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

@After
public void tearDown() {
System.setOut(null);
}

@Test
public void queryClusteredTable() {
String projectId = "java-docs-samples-testing";
String datasetName = "bigquery_test_dataset";
String tableName = "clustered_shakespeare";

QueryClusteredTable.queryClusteredTable(projectId, datasetName, tableName);
assertThat(bout.toString()).contains("Query clustered table performed successfully.");
}
}

0 comments on commit df59cc7

Please sign in to comment.