Struct expr::RowSetFinishing [−][src]
pub struct RowSetFinishing {
pub order_by: Vec<ColumnOrder>,
pub limit: Option<usize>,
pub offset: usize,
pub project: Vec<usize>,
}
Expand description
Instructions for finishing the result of a query.
The primary reason for the existence of this structure and attendant code is that SQL’s ORDER BY requires sorting rows (as already implied by the keywords), whereas much of the rest of SQL is defined in terms of unordered multisets. But as it turns out, the same idea can be used to optimize trivial peeks.
Fields
order_by: Vec<ColumnOrder>
Order rows by the given columns.
limit: Option<usize>
Include only as many rows (after offset).
offset: usize
Omit as many rows.
project: Vec<usize>
Include only given columns.
Implementations
Trait Implementations
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
Auto Trait Implementations
impl RefUnwindSafe for RowSetFinishing
impl Send for RowSetFinishing
impl Sync for RowSetFinishing
impl Unpin for RowSetFinishing
impl UnwindSafe for RowSetFinishing
Blanket Implementations
Mutably borrows from an owned value. Read more
Compare self to key
and return true
if they are equal.
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more