andygrove commented on a change in pull request #8746:
URL: https://github.com/apache/arrow/pull/8746#discussion_r529690058
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File path: rust/datafusion/src/logical_plan/expr.rs
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@@ -141,6 +166,7 @@ impl Expr {
Expr::Column(name) =>
Ok(schema.field_with_name(name)?.data_type().clone()),
Expr::ScalarVariable(_) => Ok(DataType::Utf8),
Expr::Literal(l) => Ok(l.get_datatype()),
+ Expr::Case { when_then_expr, .. } =>
when_then_expr[0].1.get_type(schema),
Review comment:
I've added a check for the case where all "then" values are literals, to
make sure they have the same type.
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