morningman commented on a change in pull request #3396:
URL: https://github.com/apache/incubator-doris/pull/3396#discussion_r415792585
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File path: fe/src/main/java/org/apache/doris/rewrite/FoldConstantsRule.java
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@@ -48,6 +50,12 @@
@Override
public Expr apply(Expr expr, Analyzer analyzer) throws AnalysisException {
+ // evaluate case when expr
+ if (expr instanceof CaseExpr && expr.getChild(0) instanceof
BoolLiteral) {
Review comment:
This is not right, the CaseExpr has multi child
1. optional case expr
2. optional list<when expr, then expr>
3. optional else expr.
The following SQL will return wrong result after applying your rewrite rule:
```
select case when false then 2 when true then 3 else 0 end;
```
Expect: 3, return 1.
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