Module expr 

Expression constructors for statistics backed by aggregate functions.

Re-exports

pub use crate::scalar_fn::fns::stat::StatFn;

pub use crate::scalar_fn::fns::stat::StatOptions;

Functions

all_nan

Creates stat(expr, all_nan), returning a nullable all-NaN statistic.

all_non_nan

Creates stat(expr, all_non_nan), returning a nullable all-non-NaN statistic.

all_non_null

Creates stat(expr, all_non_null), returning a nullable all-non-null statistic.

all_null

Creates stat(expr, all_null), returning a nullable all-null statistic.

min_max

Creates stat(expr, min_max), returning a nullable { min, max } struct statistic.

nan_count

Creates stat(expr, nan_count), returning a nullable NaN-count statistic.

null_count

Creates stat(expr, null_count), returning a nullable null-count statistic.

stat

Creates an expression that reads a stored aggregate statistic for expr.

sum

Creates stat(expr, sum), returning a nullable sum statistic.