feat: Implement BigQuery auto-schema upgrade and view creation

core/src/main/java/com/google/adk/plugins/agentanalytics/BigQueryAgentAnalyticsPlugin.java

@@ -16,6 +16,8 @@
 
 package com.google.adk.plugins.agentanalytics;
 
+import static com.google.adk.plugins.agentanalytics.BigQueryUtils.createAnalyticsViews;
+import static com.google.adk.plugins.agentanalytics.BigQueryUtils.maybeUpgradeSchema;
 import static com.google.adk.plugins.agentanalytics.JsonFormatter.convertToJsonNode;
 import static com.google.adk.plugins.agentanalytics.JsonFormatter.smartTruncate;
 import static com.google.adk.plugins.agentanalytics.JsonFormatter.toJavaObject;
@@ -143,6 +145,8 @@ private static BigQuery createBigQuery(BigQueryLoggerConfig config) throws IOExc
       builder.setCredentials(
           GoogleCredentials.getApplicationDefault().createScoped(DEFAULT_AUTH_SCOPES));
     }
+    builder = builder.setLocation(config.location());
+    builder.setProjectId(config.projectId());
     return builder.build().getService();
   }
 
@@ -172,28 +176,37 @@ private void ensureTableExists(BigQuery bigQuery, BigQueryLoggerConfig config) {
           tableDefinitionBuilder.setClustering(
               Clustering.newBuilder().setFields(config.clusteringFields()).build());
         }
-        TableInfo tableInfo = TableInfo.newBuilder(tableId, tableDefinitionBuilder.build()).build();
+        TableInfo tableInfo =
+            TableInfo.newBuilder(tableId, tableDefinitionBuilder.build())
+                .setLabels(
+                    ImmutableMap.of(
+                        BigQuerySchema.SCHEMA_VERSION_LABEL_KEY, BigQuerySchema.SCHEMA_VERSION))
+                .build();
         bigQuery.create(tableInfo);
       } else if (config.autoSchemaUpgrade()) {
-        // TODO(b/491851868): Implement auto-schema upgrade.
-        logger.info("BigQuery table already exists and auto-schema upgrade is enabled: " + tableId);
-        logger.info("Auto-schema upgrade is not implemented yet.");
+        maybeUpgradeSchema(bigQuery, table);
       }
     } catch (BigQueryException e) {
-      if (e.getMessage().contains("invalid_grant")) {
-        logger.log(
-            Level.SEVERE,
-            "Failed to authenticate with BigQuery. Please run 'gcloud auth application-default"
-                + " login' to refresh your credentials or provide valid credentials in"
-                + " BigQueryLoggerConfig.",
-            e);
-      } else {
-        logger.log(
-            Level.WARNING, "Failed to check or create/upgrade BigQuery table: " + tableId, e);
-      }
+      processBigQueryException(e, "Failed to check or create/upgrade BigQuery table: " + tableId);
     } catch (RuntimeException e) {
       logger.log(Level.WARNING, "Failed to check or create/upgrade BigQuery table: " + tableId, e);
     }
+
+    try {
+      if (config.createViews()) {
+        var unused = executor.submit(() -> createAnalyticsViews(bigQuery, config));
+      }
+    } catch (RuntimeException e) {
+      logger.log(Level.WARNING, "Failed to create/update BigQuery views for table: " + tableId, e);
+    }
+  }
+
+  private void processBigQueryException(BigQueryException e, String logMessage) {
+    if (e.getMessage().contains("invalid_grant")) {
+      logger.log(Level.SEVERE, "Failed to authenticate with BigQuery.", e);
+    } else {
+      logger.log(Level.WARNING, logMessage, e);
+    }
   }
 
   protected BigQueryWriteClient createWriteClient(BigQueryLoggerConfig config) throws IOException {

core/src/main/java/com/google/adk/plugins/agentanalytics/BigQueryLoggerConfig.java

@@ -43,6 +43,9 @@ public abstract class BigQueryLoggerConfig {
   // Max length for text content before truncation.
   public abstract int maxContentLength();
 
+  // BigQuery location.
+  public abstract String location();
+
   // Project ID for the BigQuery table.
   public abstract String projectId();
 
@@ -93,9 +96,16 @@ public abstract class BigQueryLoggerConfig {
   // Automatically add new columns to existing tables when the plugin
   // schema evolves.  Only additive changes are made (columns are never
   // dropped or altered).
-  // TODO(b/491852782): Implement auto-schema upgrade.
   public abstract boolean autoSchemaUpgrade();
 
+  // Automatically create per-event-type BigQuery views that unnest
+  // JSON columns into typed, queryable columns.
+  public abstract boolean createViews();
+
+  // Prefix for auto-created per-event-type view names.
+  // Default "v" produces views like ``v_llm_request``.
+  public abstract String viewPrefix();
+
   @Nullable
   public abstract Credentials credentials();
 
@@ -105,6 +115,7 @@ public static Builder builder() {
     return new AutoValue_BigQueryLoggerConfig.Builder()
         .enabled(true)
         .maxContentLength(500 * 1024)
+        .location("us") // Default location.
         .datasetId("agent_analytics")
         .tableName("events")
         .clusteringFields(ImmutableList.of("event_type", "agent", "user_id"))
@@ -118,8 +129,9 @@ public static Builder builder() {
         .customTags(ImmutableMap.of())
         .eventAllowlist(ImmutableList.of())
         .eventDenylist(ImmutableList.of())
-        // TODO(b/491851868): Enable auto-schema upgrade once implemented.
-        .autoSchemaUpgrade(false);
+        .autoSchemaUpgrade(true)
+        .createViews(false)
+        .viewPrefix("v");
   }
 
   /** Builder for {@link BigQueryLoggerConfig}. */
@@ -138,6 +150,9 @@ public abstract static class Builder {
     @CanIgnoreReturnValue
     public abstract Builder maxContentLength(int maxContentLength);
 
+    @CanIgnoreReturnValue
+    public abstract Builder location(String location);
+
     @CanIgnoreReturnValue
     public abstract Builder projectId(String projectId);
 
@@ -184,6 +199,12 @@ public abstract Builder contentFormatter(
     @CanIgnoreReturnValue
     public abstract Builder autoSchemaUpgrade(boolean autoSchemaUpgrade);
 
+    @CanIgnoreReturnValue
+    public abstract Builder createViews(boolean createViews);
+
+    @CanIgnoreReturnValue
+    public abstract Builder viewPrefix(String viewPrefix);
+
     @CanIgnoreReturnValue
     public abstract Builder credentials(Credentials credentials);
 

core/src/main/java/com/google/adk/plugins/agentanalytics/BigQuerySchema.java

@@ -45,6 +45,14 @@ public final class BigQuerySchema {
 
   private BigQuerySchema() {}
 
+  /**
+   * The version of the BigQuery schema. Each time the schema is changed(new fields are added), this
+   * should be incremented.
+   */
+  static final String SCHEMA_VERSION = "1";
+
+  static final String SCHEMA_VERSION_LABEL_KEY = "adk_schema_version";
+
   private static final ImmutableMap<StandardSQLTypeName, ImmutableMap<String, String>>
       FIELD_TYPE_TO_ARROW_FIELD_METADATA =
           ImmutableMap.of(