feat: add new sample - Tables: Relax column query append

samples/src/main/java/com/example/bigquery/RelaxTableQuery.java

@@ -0,0 +1,99 @@
+/*
+ * 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_relax_column_query_append]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.Job;
+import com.google.cloud.bigquery.JobId;
+import com.google.cloud.bigquery.JobInfo;
+import com.google.cloud.bigquery.JobInfo.SchemaUpdateOption;
+import com.google.cloud.bigquery.JobInfo.WriteDisposition;
+import com.google.cloud.bigquery.QueryJobConfiguration;
+import com.google.cloud.bigquery.TableId;
+import com.google.cloud.bigquery.TableResult;
+import com.google.common.collect.ImmutableList;
+import java.util.UUID;
+
+public class RelaxTableQuery {
+
+  public static void runRelaxTableQuery() {
+    // TODO(developer): Replace these variables before running the sample.
+    String datasetName = "MY_DATASET_NAME";
+    String tableName = "MY_TABLE_NAME";
+    relaxTableQuery(datasetName, tableName);
+  }
+
+  public static void relaxTableQuery(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();
+
+      TableId tableId = TableId.of(datasetName, tableName);
+      String query =
+          "SELECT "
+              + "word "
+              // TODO(developer): Replace projectId.dataset.tableName with yours
+              + "FROM `java-docs-samples-testing.bigquery_test_dataset.RELAX_TABLE_QUERY_TEST` "
+              + "WHERE word like '%is%' ";
+
+      QueryJobConfiguration queryConfig =
+          QueryJobConfiguration.newBuilder(query)
+              // Use standard SQL syntax for queries.
+              // See: https://cloud.google.com/bigquery/sql-reference/
+              .setUseLegacySql(false)
+              .setSchemaUpdateOptions(ImmutableList.of(SchemaUpdateOption.ALLOW_FIELD_RELAXATION))
+              .setWriteDisposition(WriteDisposition.WRITE_APPEND)
+              .setDestinationTable(tableId)
+              .build();
+
+      // Create a job ID so that we can safely retry.
+      JobId jobId = JobId.of(UUID.randomUUID().toString());
+      Job queryJob = bigquery.create(JobInfo.newBuilder(queryConfig).setJobId(jobId).build());
+
+      queryJob = queryJob.waitFor();
+
+      // Check for errors
+      if (queryJob == null) {
+        throw new RuntimeException("Job no longer exists");
+      } else if (queryJob.getStatus().getError() != null) {
+        // You can also look at queryJob.getStatus().getExecutionErrors() for all
+        // errors, not just the latest one.
+        throw new RuntimeException(queryJob.getStatus().getError().toString());
+      }
+
+      // Get the results.
+      TableResult results = queryJob.getQueryResults();
+
+      // Print all pages of the results.
+      results
+          .iterateAll()
+          .forEach(
+              rows -> {
+                rows.forEach(row -> System.out.println("row: " + row.toString()));
+              });
+
+      System.out.println("Successfully relaxed all columns in destination table during query job");
+    } catch (BigQueryException | InterruptedException e) {
+      System.out.println("Columns not relaxed during query job \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_relax_column_query_append]

samples/src/test/java/com/example/bigquery/RelaxTableQueryIT.java

@@ -0,0 +1,86 @@
+/*
+ * 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 static junit.framework.TestCase.assertNotNull;
+
+import com.google.cloud.bigquery.Field;
+import com.google.cloud.bigquery.LegacySQLTypeName;
+import com.google.cloud.bigquery.Schema;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class RelaxTableQueryIT {
+  private ByteArrayOutputStream bout;
+  private PrintStream out;
+
+  private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");
+
+  private static void requireEnvVar(String varName) {
+    assertNotNull(
+        "Environment variable " + varName + " is required to perform these tests.",
+        System.getenv(varName));
+  }
+
+  @BeforeClass
+  public static void checkRequirements() {
+    requireEnvVar("BIGQUERY_DATASET_NAME");
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void testRelaxTableQuery() {
+    String tableName = "RELAX_TABLE_QUERY_TEST";
+    Schema originalSchema =
+        Schema.of(
+            Field.newBuilder("word", LegacySQLTypeName.STRING).setMode(Field.Mode.REQUIRED).build(),
+            Field.newBuilder("word_count", LegacySQLTypeName.STRING)
+                .setMode(Field.Mode.REQUIRED)
+                .build(),
+            Field.newBuilder("corpus", LegacySQLTypeName.STRING)
+                .setMode(Field.Mode.REQUIRED)
+                .build(),
+            Field.newBuilder("corpus_date", LegacySQLTypeName.STRING)
+                .setMode(Field.Mode.REQUIRED)
+                .build());
+
+    CreateTable.createTable(BIGQUERY_DATASET_NAME, tableName, originalSchema);
+
+    RelaxTableQuery.relaxTableQuery(BIGQUERY_DATASET_NAME, tableName);
+    assertThat(bout.toString())
+        .contains("Successfully relaxed all columns in destination table during query job");
+
+    // Clean up
+    DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
+  }
+}