Arsnael commented on PR #2792:
URL: https://github.com/apache/james-project/pull/2792#issuecomment-3584290891
> For PG we likely could try DINSTINT ON
I tried to play around with it a bit. For listMailboxContentSortedBySentAt:
```
public Flux<MessageId> listMailboxContentSortedBySentAt(PostgresMailboxId
mailboxId, Limit limit, boolean collapseThreads) {
Preconditions.checkArgument(!limit.isUnlimited(), "Limit should be
defined");
if (collapseThreads) {
return postgresExecutor.executeRows(dslContext ->
Flux.from(dslContext.select(THREAD_ID, MESSAGE_ID)
.distinctOn(THREAD_ID)
.from(TABLE_NAME)
.where(MAILBOX_ID.eq(mailboxId.asUuid()))
.orderBy(THREAD_ID.asc(), SENT_AT.desc())
.limit(limit.getLimit().get())))
.map(record ->
PostgresMessageId.Factory.of(record.get(MESSAGE_ID)));
}
return postgresExecutor.executeRows(dslContext ->
Flux.from(dslContext.select(MESSAGE_ID)
.from(TABLE_NAME)
.where(MAILBOX_ID.eq(mailboxId.asUuid()))
.orderBy(SENT_AT.desc())
.limit(limit.getLimit().get())))
.map(record ->
PostgresMessageId.Factory.of(record.get(MESSAGE_ID)));
}
```
Unfortunately the test
`listMailboxContentSortedBySentAtShouldApplyLimitWithCollapseThreads` is
failing. I have message id 4 first in the list returned which is good, but then
I get message id 1... while I should get message id 3. I could not manage to
pass it.
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