Struct ExpandHistogramTableFunction 

pub struct ExpandHistogramTableFunction {}

A DataFusion TableFunctionImpl that expands a histogram struct into rows of (bin_center, count).

Usage:

SELECT bin_center, count
FROM expand_histogram(
  (SELECT make_histogram(0.0, 100.0, 100, value)
   FROM measures WHERE name = 'cpu_usage')
)

Implementations

impl ExpandHistogramTableFunction

pub fn new() -> ExpandHistogramTableFunction

Trait Implementations

impl Debug for ExpandHistogramTableFunction

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

Formats the value using the given formatter.

impl Default for ExpandHistogramTableFunction

fn default() -> ExpandHistogramTableFunction

Returns the “default value” for a type.

impl TableFunctionImpl for ExpandHistogramTableFunction

fn call(&self, args: &[Expr]) -> Result<Arc<dyn TableProvider>, DataFusionError>

Create a table provider