alamb commented on code in PR #5734:
URL: https://github.com/apache/arrow-datafusion/pull/5734#discussion_r1149742705


##########
datafusion/expr/src/expr_schema.rs:
##########
@@ -68,7 +69,26 @@ impl ExprSchemable for Expr {
             Expr::OuterReferenceColumn(ty, _) => Ok(ty.clone()),
             Expr::ScalarVariable(ty, _) => Ok(ty.clone()),
             Expr::Literal(l) => Ok(l.get_datatype()),
-            Expr::Case(case) => case.when_then_expr[0].1.get_type(schema),
+            Expr::Case(case) => {
+                // when #5681 will be fixed, this code can be reverted to:

Review Comment:
   I agree it would be best to have this code in Analyzer -- but if we can't 
get it in there quickly we can merge this PR as is. 
   
   Thank you for the test case @mslapek 
   
   Thank you for leaving the link to 
https://github.com/apache/arrow-datafusion/issues/5733 in the code
   
   Do you know why the `CREATE TABLE AS SELECT` does not have type coercion (as 
an optimizer pass) applied? It seems like that may be an oversight (and maybe 
the root cause of this problem)?
   



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