for example, upon opening an existing database, all the rows are in
the btree, so if we seek only from MV store, we won't find anything.
ergo: we must look from both the mv store and the btree. if we are
iterating forwards, the smallest of the two results is where we land,
and vice versa for backwards iteration.
initially this implementation used blocking IO but was refactored to
use state machines after the rest of the Cursor methods in the MVCC cursor
module were refactored to do that too.
---
this PR was initially almost entirely written using Claude Code + Opus 4.5,
but heavily manually cleaned up as the AI made the state machine refactor
far too complicated.
- added procedural macro that creates Rust tests and with just a flag,
creates a new test that runs the same with MVCC enabled
- migrated almost all tests to use this new macro and added the mvcc
flag to the tests that were not failing
- added a `TempDatabase` builder to facilitate the proc_macro to
generate the correct database options
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#3991
SQLite doesn't rewrite INSERT lists or WHEN clause, it instead
lets the trigger go "stale" and will cause runtime errors. This
may not be great behavior, but it's compatible...
- Disallow DROP COLUMN on columns referenced in triggers
- Propagate RENAME COLUMN to trigger SQL definitions
DROP COLUMN is not allowed when the column is mentioned in a trigger
on the table the column is dropped from, eg:
```
turso> CREATE TABLE t(x,y);
turso> CREATE TRIGGER foo BEFORE INSERT ON t BEGIN INSERT INTO t VALUES (NEW.x); END;
turso> ALTER TABLE t DROP COLUMN x;
× Parse error: cannot drop column "x": it is referenced in trigger foo
```
However, it is allowed if the trigger is on another table:
```
turso> CREATE TABLE t(x,y);
turso> CREATE TABLE u(x,y);
turso> CREATE TRIGGER bar BEFORE INSERT ON t BEGIN INSERT INTO u(y) VALUES (NEW.x); END;
turso> ALTER TABLE u DROP COLUMN y;
turso> INSERT INTO t VALUES (1,1);
× Parse error: table u has no column named y
```
Nearly all of the code here is vibecoded. I first asked Cursor Composer to create
an initial implementation. Then, I asked it to try to discover edge cases using the
`turso` and `sqlite3` CLIs, and write tests+fixes for the edge cases found.
The code is a bit slop, but this isn't a particularly performance-critical use case
and it should solve most of the issues with RENAME and DROP COLUMN.
When building text values, we could not pass ownership of newly created
strings, which meant a lot of the times we were double cloning strings,
one to transform, and one to build the Value
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#3932
This PR implements more sophisticated algorithm in the toy vector sparse
index: now we enumerate components based on the frequency (in order to
check unpopular "features" first) and also estimate length threshold
which can give us better results compared with current top-k set.
Also, this PR adds optional `delta` parameter which can enable
approximate search which will return results with score not more than
`delta` away from the optimal.
In order to implement this index method - index code were slightly
adjusted in order to allow to store some non-key payload in the index
rows. So, now index can hold N columns where first K <= N columns will
be used as identity (before that K always was equal to N).
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#3862
thread 'query_processing::test_read_path::test_stmt_reset' panicked at core/storage/sqlite3_ondisk.rs:754:9:
assertion failed: self.page_type() == PageType::TableLeaf
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
test query_processing::test_read_path::test_stmt_reset ... FAILED
