pub struct ColumnRef {
pub level: usize,
pub column: usize,
}
Expand description
A leveled column reference.
In the course of decorrelation, multiple levels of nested subqueries are traversed, and references to columns may correspond to different levels of containing outer subqueries.
A ColumnRef
allows expressions to refer to columns while being clear
about which level the column references without manually performing the
bookkeeping tracking their actual column locations.
Specifically, a ColumnRef
refers to a column level
subquery level out
from the reference, using column
as a unique identifier in that subquery level.
A level
of zero corresponds to the current scope, and levels increase to
indicate subqueries further “outwards”.
Fields§
§level: usize
§column: usize
Trait Implementations§
source§impl<'de> Deserialize<'de> for ColumnRef
impl<'de> Deserialize<'de> for ColumnRef
source§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
source§impl Ord for ColumnRef
impl Ord for ColumnRef
source§impl PartialEq for ColumnRef
impl PartialEq for ColumnRef
source§impl PartialOrd for ColumnRef
impl PartialOrd for ColumnRef
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self
and other
) and is used by the <=
operator. Read moreimpl Copy for ColumnRef
impl Eq for ColumnRef
impl StructuralEq for ColumnRef
impl StructuralPartialEq for ColumnRef
Auto Trait Implementations§
impl RefUnwindSafe for ColumnRef
impl Send for ColumnRef
impl Sync for ColumnRef
impl Unpin for ColumnRef
impl UnwindSafe for ColumnRef
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fn equivalent(&self, key: &K) -> bool
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