twalthr commented on a change in pull request #14329:
URL: https://github.com/apache/flink/pull/14329#discussion_r539949533
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/extraction/DataTypeExtractor.java
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@@ -377,6 +397,11 @@ private void checkForCommonErrors(Type type) {
"Usually, this indicates that class
information is missing or got lost. " +
"Please specify a more concrete class
or treat it as a RAW type.",
Object.class.getName());
+ } else if (INTERNAL_DATA_STRUCTURES.contains(clazz)) {
+ throw extractionError(
+ "Cannot extract a data type from a pure
internal '%s' class. " +
Review comment:
I improved the message to:
```
Cannot extract a data type from an internal '%s' class without further
information. " +
"Please use annotations to define the
full logical type.
```
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