amorynan commented on code in PR #16948:
URL: https://github.com/apache/doris/pull/16948#discussion_r1112054418


##########
fe/fe-core/src/main/java/org/apache/doris/analysis/MapLiteral.java:
##########
@@ -47,30 +47,18 @@ public MapLiteral(LiteralExpr... exprs) throws 
AnalysisException {
         Type keyType = Type.NULL;
         Type valueType = Type.NULL;
         children = new ArrayList<>();
-        int idx = 0;
-        // TODO(xy): limit key type to scalar type
-        for (LiteralExpr expr : exprs) {
-            if (idx % 2 == 0) {
-                if (keyType == Type.NULL) {
-                    keyType = expr.getType();
-                } else {
-                    keyType = Type.getAssignmentCompatibleType(keyType, 
expr.getType(), true);
-                }
-                if (keyType == Type.INVALID) {
-                    throw new AnalysisException("Invalid element type in Map");
-                }
-            } else {
-                if (valueType == Type.NULL) {
-                    valueType = expr.getType();
-                } else {
-                    valueType = Type.getAssignmentCompatibleType(valueType, 
expr.getType(), true);
-                }
-                if (valueType == Type.INVALID) {
-                    throw new AnalysisException("Invalid element type in Map");
-                }
+        for (int idx = 0; idx < exprs.length && idx + 1 < exprs.length; idx += 
2) {
+            // limit key type to scalar type
+            keyType = Type.getAssignmentCompatibleType(keyType, 
exprs[idx].getType(), true);
+            if (keyType == Type.INVALID || !keyType.isScalarType()) {
+                throw new AnalysisException("Invalid key type in Map Only 
support scalar type");

Review Comment:
   1, 3, 4  I got it !
   but 2 u means, expr type may be valid scalar type for key but also throw 
error ?



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