presto-spi/src/main/java/io/prestosql/spi/type/SqlTimestamp.java/SqlTimestamp/equals
class SqlTimestamp:    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        SqlTimestamp other = (SqlTimestamp) obj;
        return Objects.equals(this.millis, other.millis) &&
                Objects.equals(this.sessionTimeZoneKey, other.sessionTimeZoneKey);
    }