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MeasureSlot

risingwave_frontend::binder::relation::match_recognize

Struct MeasureSlot 

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pub struct MeasureSlot {
    pub kind: MeasureSlotKind,
    pub vars: Vec<String>,
    pub col_idx: usize,
    pub data_type: DataType,
    pub agg: Option<PlanAggCall>,
}
Expand description

One navigation input that a measure expression reads. A measure is lowered to an expression over a synthetic row whose i-th column is produced by slots[i]; the executor materializes that row per match (the column values are only knowable once the match and its per-row labels are found) and then evaluates the expression.

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§kind: MeasureSlotKind§vars: Vec<String>

Pattern variables this slot navigates over: one for a plain variable, several for a SUBSET union variable. A row matches if its label is any of these. Empty for CLASSIFIER.

§col_idx: usize

Input column index to read. Ignored for MeasureSlotKind::Classifier.

§data_type: DataType

The slot’s output type: the input column type for navigation, varchar for classifier.

§agg: Option<PlanAggCall>

The aggregate to run for MeasureSlotKind::Sum, over a single input column (the projected col_idx) of the rows whose label is in vars. None for other kinds.

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impl Clone for MeasureSlot

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fn clone(&self) -> MeasureSlot

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for MeasureSlot

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Eq for MeasureSlot

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impl Hash for MeasureSlot

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for MeasureSlot

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fn eq(&self, other: &MeasureSlot) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for MeasureSlot

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