From d9f5cf0e69a0c44d907c960082023ea1a5b048ee Mon Sep 17 00:00:00 2001
From: Simon Binder <oss@simonbinder.eu>
Date: Sat, 29 Jun 2019 18:02:44 +0200
Subject: [PATCH] Resolve types for case expressions

---
 sqlparser/lib/src/analysis/types/resolver.dart | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sqlparser/lib/src/analysis/types/resolver.dart b/sqlparser/lib/src/analysis/types/resolver.dart
index d8a13898..c072778d 100644
--- a/sqlparser/lib/src/analysis/types/resolver.dart
+++ b/sqlparser/lib/src/analysis/types/resolver.dart
@@ -91,6 +91,8 @@ class TypeResolver {
         }
       } else if (expr is BetweenExpression) {
         return const ResolveResult(ResolvedType.bool());
+      } else if (expr is CaseExpression) {
+        return resolveExpression(expr.whens.first.then);
       } else if (expr is SubQuery) {
         // todo
       }
@@ -247,7 +249,8 @@ class TypeResolver {
   ResolveResult _argumentType(Expression parent, Expression argument) {
     if (parent is IsExpression ||
         parent is BinaryExpression ||
-        parent is BetweenExpression) {
+        parent is BetweenExpression ||
+        parent is CaseExpression) {
       final relevant = parent.childNodes
           .lastWhere((node) => node is Expression && node != argument);
       return resolveExpression(relevant as Expression);