Hi Devs, I am trying to utilize Calcite type inference in my Flink and realize that one of the situations will cause exception when trying to infer the operand type based on a StructType return type. [1]
Seems like there's a requirement [2] that if return type is a struct, the operand # and return type field list size need to be the same. I was wondering if there is specific design reason behind this such as it is required to flatten the nested structure field? I have attached a test to reproduced the exception when dealing with records that has only 1 single field in the field list [3]. Much appreciate the pointers and suggestions in advance. -- Rong [1] https://issues.apache.org/jira/browse/FLINK-10019 [2] https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/type/InferTypes.java#L68 [3] https://github.com/apache/calcite/compare/master...walterddr:struct_type_inference_error
