public boolean hasGcsSource() {
      return ((bitField0_ & 0x00000001) != 0);
    }
<pre>
Required. Google Cloud Storage location.
</pre>

<code>
.google.cloud.vertexai.v1.GcsSource gcs_source = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return Whether the gcsSource field is set.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/CsvSource.java