Review comments

google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/ConnectionSettings.java

@@ -36,8 +36,7 @@ public abstract class ConnectionSettings {
    * Returns useReadAPI flag, enabled by default. Read API will be used if the underlying conditions
    * are satisfied and this flag is enabled
    */
-  @Nullable
-  public abstract Boolean getUseReadAPI();
+  public abstract boolean getUseReadAPI();
 
   /** Returns the synchronous response timeoutMs associated with this query */
   @Nullable
@@ -221,7 +220,7 @@ Builder withDefaultValues() {
      *
      * @param useReadAPI or {@code true} for none
      */
-    public abstract Builder setUseReadAPI(@Nullable Boolean useReadAPI);
+    public abstract Builder setUseReadAPI(boolean useReadAPI);
 
     /**
      * Sets how long to wait for the query to complete, in milliseconds, before the request times

google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/ReadClientConnectionConfiguration.java

@@ -18,6 +18,7 @@
 
 import com.google.auto.value.AutoValue;
 import java.io.Serializable;
+import javax.annotation.Nullable;
 
 /** Represents BigQueryStorage Read client connection information. */
 @AutoValue
@@ -30,31 +31,34 @@ public abstract static class Builder {
      * Sets the total row count to page row count ratio used to determine whether to us the
      * BigQueryStorage Read client to fetch result sets after the first page.
      */
-    public abstract Builder setTotalToPageRowCountRatio(Long ratio);
+    public abstract Builder setTotalToPageRowCountRatio(@Nullable Long ratio);
 
     /**
      * Sets the minimum number of table rows in the query results used to determine whether to us
      * the BigQueryStorage Read client to fetch result sets after the first page.
      */
-    public abstract Builder setMinResultSize(Long numRows);
+    public abstract Builder setMinResultSize(@Nullable Long numRows);
 
     /**
      * Sets the maximum number of table rows allowed in buffer before streaming them to the
      * BigQueryResult.
      */
-    public abstract Builder setBufferSize(Long bufferSize);
+    public abstract Builder setBufferSize(@Nullable Long bufferSize);
 
     /** Creates a {@code ReadClientConnectionConfiguration} object. */
     public abstract ReadClientConnectionConfiguration build();
   }
 
   /** Returns the totalToPageRowCountRatio in this configuration. */
+  @Nullable 
   public abstract Long getTotalToPageRowCountRatio();
 
   /** Returns the minResultSize in this configuration. */
+  @Nullable 
   public abstract Long getMinResultSize();
 
   /** Returns the bufferSize in this configuration. */
+  @Nullable 
   public abstract Long getBufferSize();
 
   public abstract Builder toBuilder();