wiedld commented on code in PR #17248:
URL: https://github.com/apache/datafusion/pull/17248#discussion_r2286490220
##########
datafusion/optimizer/src/analyzer/type_coercion.rs:
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@@ -957,6 +957,43 @@ fn coerce_case_expression(case: Case, schema: &DFSchema)
-> Result<Case> {
///
/// This method presumes that the wildcard expansion is unneeded, or has
already
/// been applied.
+///
+/// ## Schema and Field Handling in Union Coercion
+///
Review Comment:
Note that here in the analyzer, we handle union coercion differently than at
construction.
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