GCP: Add Iceberg Catalog for GCP BigLake Metastore

build.gradle

@@ -624,20 +624,30 @@ project(':iceberg-gcp') {
     implementation project(':iceberg-common')
     implementation project(':iceberg-core')
 
-    compileOnly platform(libs.google.libraries.bom)
-    compileOnly "com.google.cloud:google-cloud-storage"
-
-    testImplementation "com.google.cloud:google-cloud-nio"
+    implementation platform(libs.google.libraries.bom)
+    implementation 'com.google.cloud:google-cloud-storage'
+    implementation libs.google.cloud.biglake
+    implementation 'com.google.cloud:google-cloud-nio'
+    compileOnly(libs.hadoop2.common) {
+      exclude group: 'org.apache.avro', module: 'avro'
+      exclude group: 'org.slf4j', module: 'slf4j-log4j12'
+      exclude group: 'javax.servlet', module: 'servlet-api'
+      exclude group: 'com.google.code.gson', module: 'gson'
+    }
 
     testImplementation project(path: ':iceberg-api', configuration: 'testArtifacts')
+    testImplementation project(path: ':iceberg-core', configuration: 'testArtifacts')
 
+    testImplementation libs.esotericsoftware.kryo
+    testImplementation libs.google.cloud.biglake.grpc
+    testImplementation libs.google.cloud.nio
+    testImplementation 'com.google.api:gax-grpc:2.28.1:testlib'
     testImplementation(libs.hadoop2.common) {
       exclude group: 'org.apache.avro', module: 'avro'
       exclude group: 'org.slf4j', module: 'slf4j-log4j12'
       exclude group: 'javax.servlet', module: 'servlet-api'
       exclude group: 'com.google.code.gson', module: 'gson'
     }
-    testImplementation libs.esotericsoftware.kryo
   }
 }
 

gcp/src/main/java/org/apache/iceberg/gcp/GCPProperties.java

@@ -25,6 +25,7 @@
 import org.apache.iceberg.util.PropertyUtil;
 
 public class GCPProperties implements Serializable {
+  // For Google Cloud Storage (GCS).
   // Service Options
   public static final String GCS_PROJECT_ID = "gcs.project-id";
   public static final String GCS_CLIENT_LIB_TOKEN = "gcs.client-lib-token";
@@ -49,6 +50,17 @@ public class GCPProperties implements Serializable {
    */
   public static final int GCS_DELETE_BATCH_SIZE_DEFAULT = 50;
 
+  // The GCP project ID. Required.
+  public static final String PROJECT_ID = "project-id";
+
+  // The GCP region (https://cloud.google.com/bigquery/docs/locations). Required.
+  public static final String REGION = "region";
+
+  // The BigLake Metastore catalog ID. It is the container resource of databases and tables.
+  // It links a BLMS catalog with this Iceberg catalog.
+  // Optional, default to the Spark catalog plugin name.
+  public static final String BIGLAKE_CATALOG_ID = "catalog-id";
+
   private String projectId;
   private String clientLibToken;
   private String serviceHost;