to integer. Exising functions' behavior is tailored to `CAST` ops.
SQLite has different behavior when it comes to handling string to
`integer` conversion in CAST vs predicate ops.
This PR adds column names to the ouput of js pragma function.
Reviewed-by: Diego Reis (@el-yawd)
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes#1608
Due to the left-prefix rule of indexes, for an index key to be usable,
it needs to:
- Use the columns in contiguous order (0, 1, 2...)
* eg if WHERE refers to cols 0 and 2, only 0 can be used
- Stop at the first range operator
* eg if WHERE: col1 = 5 AND col2 > 5 AND col3 = 5, only col1 and col2
can be used.
This wasn't properly tested, and resulted in simulator failures (e.g.
seed `10818913476224476676` which no longer fails with this fix). Added
some regression tests for this behavior, as well.
Reviewed-by: Preston Thorpe (@PThorpe92)
Reviewed-by: Pere Diaz Bou <pere-altea@homail.com>
Closes#1698
Due to the left-prefix rule of indexes, for an index key to be usable,
it needs to:
- Use the columns in contiguous order (0, 1, 2...)
* eg if WHERE refers to cols 0 and 2, only 0 can be used
- Stop at the first range operator
* eg if WHERE: col1 = 5 AND col2 > 5 AND col3 = 5, only col1 and col2
can be used.
This wasn't properly tested, and resulted in simulator failures. Added
some regression tests for this behavior.
The major change in this PR is the following:
- It refactors deserializing the record from the cell so that it does
not happen in `next()` or `prev()`, but lazily when it is needed. This
will allow a further enhancement where we only read a _partial_ section
of the record payload, e.g. when `Insn::Column` is requested by the
VDBE, we can only deserialize the relevant column.
It also fixes multiple bugs in `BTreeCursor`
Follow-ups:
ASAP: fix performance regression (probably due to too much record
invalidation)
ASAP: do post-balance seek key calculation only when balance will be
needed
ASAP: fix balancing scenario where interior index cell is deleted - even
if leaf doesnt require balance, parent might. both need to be checked
LATER: implement safe way to use indexes for UPDATE -- ephemeral indexes
needed, see FIXME in `optimizer/mod.rs`
LATER: implement on-demand serialization of parts of the record, instead
of entire record
Closes#1664
