feat: add new sample - Load: Column Based Time Partitioning (#119)

* feat: add new sample - Load: Column Based Time Partitioning

* update code format

* update base on comments

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

@@ -30,7 +30,6 @@
 import com.google.cloud.bigquery.LegacySQLTypeName;
 import com.google.cloud.bigquery.LoadJobConfiguration;
 import com.google.cloud.bigquery.Schema;
-import com.google.cloud.bigquery.Table;
 import com.google.cloud.bigquery.TableId;
 import com.google.common.collect.ImmutableList;
 import java.util.UUID;
@@ -53,7 +52,6 @@ public static void addColumnLoadAppend(String datasetName, String tableName, Str
       BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
 
       TableId tableId = TableId.of(datasetName, tableName);
-      Table table = bigquery.getTable(tableId);
 
       // Add a new column to a BigQuery table while appending rows via a load job.
       // 'REQUIRED' fields cannot  be added to an existing schema, so the additional column must be
@@ -79,7 +77,6 @@ public static void addColumnLoadAppend(String datasetName, String tableName, Str
       // Create a job ID so that we can safely retry.
       JobId jobId = JobId.of(UUID.randomUUID().toString());
       Job loadJob = bigquery.create(JobInfo.newBuilder(loadJobConfig).setJobId(jobId).build());
-      System.out.println(loadJob.getJobId());
 
       // Load data from a GCS parquet file into the table
       // Blocks until this load table job completes its execution, either failing or succeeding.

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

@@ -0,0 +1,102 @@
+/*
+ * 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_load_table_partitioned]
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.BigQueryException;
+import com.google.cloud.bigquery.BigQueryOptions;
+import com.google.cloud.bigquery.Field;
+import com.google.cloud.bigquery.FormatOptions;
+import com.google.cloud.bigquery.Job;
+import com.google.cloud.bigquery.JobId;
+import com.google.cloud.bigquery.JobInfo;
+import com.google.cloud.bigquery.LoadJobConfiguration;
+import com.google.cloud.bigquery.Schema;
+import com.google.cloud.bigquery.StandardSQLTypeName;
+import com.google.cloud.bigquery.TableId;
+import com.google.cloud.bigquery.TimePartitioning;
+import java.time.Duration;
+import java.time.temporal.ChronoUnit;
+import java.util.UUID;
+
+public class LoadPartitionedTable {
+
+  public static void runLoadPartitionedTable() throws Exception {
+    // TODO(developer): Replace these variables before running the sample.
+    String datasetName = "MY_DATASET_NAME";
+    String tableName = "MY_TABLE_NAME";
+    String sourceUri = "/path/to/file.csv";
+    loadPartitionedTable(datasetName, tableName, sourceUri);
+  }
+
+  public static void loadPartitionedTable(String datasetName, String tableName, String sourceUri)
+      throws Exception {
+    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);
+
+      Schema schema =
+          Schema.of(
+              Field.of("name", StandardSQLTypeName.STRING),
+              Field.of("post_abbr", StandardSQLTypeName.STRING),
+              Field.of("date", StandardSQLTypeName.DATE));
+
+      // Configure time partitioning. For full list of options, see:
+      // https://cloud.google.com/bigquery/docs/reference/rest/v2/tables#TimePartitioning
+      TimePartitioning partitioning =
+          TimePartitioning.newBuilder(TimePartitioning.Type.DAY)
+              .setField("date")
+              .setExpirationMs(Duration.of(90, ChronoUnit.DAYS).toMillis())
+              .build();
+
+      LoadJobConfiguration loadJobConfig =
+          LoadJobConfiguration.builder(tableId, sourceUri)
+              .setFormatOptions(FormatOptions.csv())
+              .setSchema(schema)
+              .setTimePartitioning(partitioning)
+              .build();
+
+      // Create a job ID so that we can safely retry.
+      JobId jobId = JobId.of(UUID.randomUUID().toString());
+      Job loadJob = bigquery.create(JobInfo.newBuilder(loadJobConfig).setJobId(jobId).build());
+
+      // Load data from a GCS parquet file into the table
+      // Blocks until this load table job completes its execution, either failing or succeeding.
+      Job completedJob = loadJob.waitFor();
+
+      // Check for errors
+      if (completedJob == null) {
+        throw new Exception("Job not executed since it no longer exists.");
+      } else if (completedJob.getStatus().getError() != null) {
+        // You can also look at queryJob.getStatus().getExecutionErrors() for all
+        // errors, not just the latest one.
+        throw new Exception(
+            "BigQuery was unable to load into the table due to an error: \n"
+                + loadJob.getStatus().getError());
+      }
+      System.out.println("Data successfully loaded into time partitioned table during load job");
+    } catch (BigQueryException | InterruptedException e) {
+      System.out.println(
+          "Data not loaded into time partitioned table during load job \n" + e.toString());
+    }
+  }
+}
+// [END bigquery_load_table_partitioned]

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

@@ -16,6 +16,7 @@
 
 package com.example.bigquery;
 
+import static com.google.common.truth.Truth.assertThat;
 import static junit.framework.TestCase.assertNotNull;
 
 import com.google.cloud.bigquery.Field;
@@ -72,6 +73,8 @@ public void testAddColumnLoadAppend() throws Exception {
 
     AddColumnLoadAppend.addColumnLoadAppend(BIGQUERY_DATASET_NAME, tableName, sourceUri);
 
+    assertThat(bout.toString()).contains("Column successfully added during load append job");
+
     // Clean up
     DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
   }

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

@@ -0,0 +1,72 @@
+/*
+ * 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 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 LoadPartitionedTableIT {
+  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() {
+    bout = new ByteArrayOutputStream();
+    out = new PrintStream(bout);
+    System.setOut(out);
+  }
+
+  @After
+  public void tearDown() {
+    System.setOut(null);
+  }
+
+  @Test
+  public void loadPartitionedTable() throws Exception {
+    String sourceUri = "gs://cloud-samples-data/bigquery/us-states/us-states-by-date.csv";
+
+    String tableName = "PARTITIONED_TABLE_TEST";
+
+    LoadPartitionedTable.loadPartitionedTable(BIGQUERY_DATASET_NAME, tableName, sourceUri);
+
+    assertThat(bout.toString())
+        .contains("Data successfully loaded into time partitioned table during load job");
+
+    // Clean up
+    DeleteTable.deleteTable(BIGQUERY_DATASET_NAME, tableName);
+  }
+}