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Add expr_fn::stddev #5409

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Merged
alamb merged 1 commit into from
Feb 28, 2023
Merged

Add expr_fn::stddev #5409

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10 changes: 10 additions & 0 deletions datafusion/expr/src/expr_fn.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -248,6 +248,16 @@ pub fn scalar_subquery(subquery: Arc<LogicalPlan>) -> Expr {
Expr::ScalarSubquery(Subquery { subquery })
}

/// Create an expression to represent the stddev() aggregate function
pub fn stddev(expr: Expr) -> Expr {
Expr::AggregateFunction(AggregateFunction::new(
aggregate_function::AggregateFunction::Stddev,
vec![expr],
false,
None,
))
}

/// Create a grouping set
pub fn grouping_set(exprs: Vec<Vec<Expr>>) -> Expr {
Expr::GroupingSet(GroupingSet::GroupingSets(exprs))
Expand Down