Jimexist commented on a change in pull request #1006:
URL: https://github.com/apache/arrow-datafusion/pull/1006#discussion_r727248989
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File path: datafusion/src/logical_plan/expr.rs
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@@ -245,6 +246,13 @@ pub enum Expr {
IsNull(Box<Expr>),
/// arithmetic negation of an expression, the operand must be of a signed
numeric data type
Negative(Box<Expr>),
+ /// Returns the field of a [`ListArray`] or ['DictionaryArray'] by name
Review comment:
by string name or integer indices?
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