enum ScalarFunc {
DataFusionBuiltin(Arc<ScalarUDF>),
DataFusionUdf(Arc<ScalarUDF>),
Udf(Arc<ScalarUDF>),
ExtrapolateUdf(Arc<ScalarUDF>, i64),
GeneratedExpr,
}Expand description
Represents different types of scalar functions supported in PromQL expressions. Each variant defines how the function should be processed and what arguments it expects.
Variants§
DataFusionBuiltin(Arc<ScalarUDF>)
DataFusion’s registered(including built-in) scalar functions (e.g., abs, sqrt, round, clamp). These are passed through directly to DataFusion’s execution engine. Processing: Simple argument insertion at the specified position.
DataFusionUdf(Arc<ScalarUDF>)
User-defined functions registered in DataFusion’s function registry. Similar to DataFusionBuiltin but for custom functions not built into DataFusion. Processing: Direct pass-through with argument positioning.
Udf(Arc<ScalarUDF>)
PromQL-specific functions that operate on time series data with temporal context. These functions require both timestamp ranges and values to perform calculations. Processing: Automatically injects timestamp_range and value columns as first arguments. Examples: idelta, irate, resets, changes, deriv, *_over_time function
ExtrapolateUdf(Arc<ScalarUDF>, i64)
PromQL functions requiring extrapolation calculations with explicit range information. These functions need to know the time range length to perform rate calculations. The second field contains the range length in milliseconds. Processing: Injects timestamp_range, value, time_index columns and appends range_length. Examples: increase, rate, delta
GeneratedExpr
Functions that generate expressions directly without external UDF calls. The expression is constructed during function matching and requires no additional processing. Examples: time(), minute(), hour(), month(), year() and other date/time extractors
Trait Implementations§
Source§impl Clone for ScalarFunc
impl Clone for ScalarFunc
Source§fn clone(&self) -> ScalarFunc
fn clone(&self) -> ScalarFunc
Returns a copy of the value. Read more
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source. Read moreAuto Trait Implementations§
impl Freeze for ScalarFunc
impl !RefUnwindSafe for ScalarFunc
impl Send for ScalarFunc
impl Sync for ScalarFunc
impl Unpin for ScalarFunc
impl !UnwindSafe for ScalarFunc
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