jayzhan211 commented on code in PR #6796:
URL: https://github.com/apache/arrow-datafusion/pull/6796#discussion_r1286491902
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datafusion/expr/src/expr.rs:
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@@ -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> {
Review Comment:
Since we only support flatten on array now so I check if it is make_array.
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