vlsi commented on a change in pull request #2614:
URL: https://github.com/apache/calcite/pull/2614#discussion_r753656126
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File path: core/src/main/java/org/apache/calcite/rel/externalize/RelJson.java
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@@ -296,6 +296,13 @@ private RelDataType getRelDataType(RelDataTypeFactory
typeFactory, Map<String, O
componentType = toType(typeFactory, component);
return typeFactory.createArrayType(componentType, -1);
+ case MAP:
+ Object key = requireNonNull(map.get("key"), "key");
+ Object value = requireNonNull(map.get("value"), "key");
Review comment:
```suggestion
Object key = get(map, "key");
Object value = get(map, "key");
```
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