fix: allow LIMIT 0 for SELECT queries

[ygabuev]

This PR enables the correct queries of form SELECT ... LIMIT 0.
Before that, the limit-clause wasn't applied to the query.

Closes #801

[ygabuev]

The new tests fail for mssql, I've checked and they also fail for current master. Given that there were no tests for the LIMIT clause, I have a felling that the implementation for LIMIT and/or OFFSET is broken for mssql.

If this is true, it might be a better idea to fix those in a separate PR.

UPD: this ticket seems related #811

[vmihailenco]

let's use sql.NullInt32 here

[vmihailenco]

@ygabuev this looks good, but I can't merge a PR that breaks the build....

[CL-Jeremy]

The new tests fail for mssql, I've checked and they also fail for current master. Given that there were no tests for the LIMIT clause, I have a felling that the implementation for LIMIT and/or OFFSET is broken for mssql.

If this is true, it might be a better idea to fix those in a separate PR.

UPD: this ticket seems related #811

Hi, I just implemented a fix for that problem in #1009. Could you please test if this workaround fixes your problem?

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. If there is no update within the next 7 days, this pr will be closed. Please feel free to give a status update now, ping for review, when it's ready. Thank you for your contributions!