final String tableName = "testUpdateTableSchema_TableName";
client.dropDatabase(dbName, true, HCatClient.DropDBMode.CASCADE);
client.createDatabase(HCatCreateDBDesc.create(dbName).build());
List<HCatFieldSchema> oldSchema = Arrays.asList(new HCatFieldSchema("foo", Type.INT, ""),
new HCatFieldSchema("bar", Type.STRING, ""));
client.createTable(HCatCreateTableDesc.create(dbName, tableName, oldSchema).build());
List<HCatFieldSchema> newSchema = Arrays.asList(new HCatFieldSchema("completely", Type.DOUBLE, ""),
new HCatFieldSchema("new", Type.FLOAT, ""),
new HCatFieldSchema("fields", Type.STRING, ""));
client.updateTableSchema(dbName, tableName, newSchema);
assertArrayEquals(newSchema.toArray(), client.getTable(dbName, tableName).getCols().toArray());