presto-jmx/src/main/java/io/prestosql/plugin/jmx/JmxColumnHandle.java/JmxColumnHandle/JmxColumnHandle
class JmxColumnHandle:    @JsonCreator
    public JmxColumnHandle(
            @JsonProperty("columnName") String columnName,
            @JsonProperty("columnType") Type columnType)
    {
        this.columnName = requireNonNull(columnName, "columnName is null");
        this.columnType = requireNonNull(columnType, "columnType is null");
    }