Dandandan commented on a change in pull request #303:
URL: https://github.com/apache/arrow-datafusion/pull/303#discussion_r629298188
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File path: datafusion/src/physical_plan/math_expressions.rs
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@@ -116,3 +116,21 @@ math_unary_function!("exp", exp);
math_unary_function!("ln", ln);
math_unary_function!("log2", log2);
math_unary_function!("log10", log10);
+
+/// random SQL function
+pub fn random(args: &[ColumnarValue]) -> Result<ColumnarValue> {
+ let len = match &args[0] {
+ ColumnarValue::Array(array) => array.len(),
+ _ => {
+ return Err(DataFusionError::Internal(
+ "Expect random function to take no param".to_string(),
+ ))
+ }
+ };
+ let mut rng = thread_rng();
+ let mut array = Vec::with_capacity(len);
+ for _ in 0..len {
+ array.push(Some(rng.gen_range(0.0..1.0)))
Review comment:
`arrow::compute::kernels::arity::unary` could be probably used here.
see also:
https://github.com/apache/arrow-datafusion/pull/309
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