against tampering and corruption.
Previously, we did not use the first 100 bytes in encryption
machinery. This patch changes that and uses that data as
associated data. So in case the header is corrupted or
tampered with, the decryption will fail.
TransitionResult is an internal implementation detail that tells
an invocation of StateMachine::step() to continue looping, but it
is of no use to other callers.
For this reason, just return an IOResult from StateMachine::step()
which simplifies the result handling.
This PR adds support for partial indexes, e.g. `CREATE INDEX` with a
provided predicate
```sql
CREATE UNIQUE INDEX idx_expensive ON products(sku) where price > 100;
```
The PR does not yet implement support for using the partial indexes in
the optimizer.
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#3228
We use relaxed ordering in a lot of places where we really need to
ensure all CPUs see the write. Switch to sequential consistency, unless
acquire/release is explicitly used. If there are places that can be
optimized, we can switch to relaxed case-by-case, but have a comment
explaning *why* it is safe.
Closes#3193
We use relaxed ordering in a lot of places where we really need to
ensure all CPUs see the write. Switch to sequential consistency, unless
acquire/release is explicitly used. If there are places that can be
optimized, we can switch to relaxed case-by-case, but have a comment
explaning *why* it is safe.
Currently header changes are tracked through pager by reading page 1.
MVCC has it's own layer to track changes during txn so this commit makes
it so that headers are tracked by each txn separately.
On commit we update the _global_ header which is used to update
`database_size` because pager commits require it to be up to date. This
also makes it _simpler_ to keep track of header updates and update
pager's header accordingly.
This PR is needed in order to make logical log work because we don't
want to rely on pager as much as possible!
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#3156
