jayzhan211 commented on code in PR #6796:
URL: https://github.com/apache/arrow-datafusion/pull/6796#discussion_r1346614106
##########
datafusion/expr/src/expr.rs:
##########
@@ -970,6 +987,43 @@ impl Expr {
pub fn contains_outer(&self) -> bool {
!find_out_reference_exprs(self).is_empty()
}
+
+ /// Flatten the nested array expressions until the base array is reached.
+ /// For example:
+ /// unnest([[1, 2, 3], [4, 5, 6]]) => unnest([1, 2, 3, 4, 5, 6])
+ pub fn flatten(&self) -> Self {
+ self.try_flatten().unwrap_or_else(|_| self.clone())
+ }
+
+ pub fn try_flatten(&self) -> Result<Self> {
+ match self {
+ Self::ScalarFunction(ScalarFunction {
+ fun: built_in_function::BuiltinScalarFunction::MakeArray,
+ args,
+ }) => {
+ let flatten_args: Vec<Expr> =
+ args.iter().flat_map(Self::flatten_internal).collect();
+ Ok(Self::ScalarFunction(ScalarFunction {
+ fun: built_in_function::BuiltinScalarFunction::MakeArray,
+ args: flatten_args,
+ }))
+ }
+ _ => Err(DataFusionError::Internal(format!(
Review Comment:
The updated version is in
https://github.com/apache/arrow-datafusion/pull/7461/files
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