presto-example-http/src/main/java/io/prestosql/plugin/example/ExampleClient.java/ExampleClient/getTable
class ExampleClient:    public ExampleTable getTable(String schema, String tableName)
    {
        requireNonNull(schema, "schema is null");
        requireNonNull(tableName, "tableName is null");
        Map<String, ExampleTable> tables = schemas.get().get(schema);
        if (tables == null) {
            return null;
        }
        return tables.get(tableName);
    }