public static Collection<PdxType> pdxDeleteField(String dsName, File[] dsDirs, String className,
      String fieldName) throws Exception {
    try {
      DiskStoreImpl dsi = createForOfflineModify(dsName, dsDirs);
      return dsi.pdxDeleteField(className, fieldName);
    } finally {
      cleanupOffline();
    }
  }
Returns a collection of the types with a deleted field
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java