presto-parser/src/main/java/io/prestosql/sql/tree/DereferenceExpression.java/DereferenceExpression/equals
class DereferenceExpression:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        DereferenceExpression that = (DereferenceExpression) o;
        return Objects.equals(base, that.base) &&
                Objects.equals(field, that.field);
    }