flink sql 1.10 insert into tb select 复杂schema 失败

create table xxx (
a string,
b row(
c row(d string)
)
)

当c 中有值的时候，sql 如下 insert into select * from xxx会出现下面错误

Caused by: java.lang.ClassCastException:
org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.NullNode
cannot be cast to
org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode
at
org.apache.flink.formats.json.JsonRowSerializationSchema.lambda$assembleRowConverter$dd344700$1(JsonRowSerializationSchema.java:337)
at
org.apache.flink.formats.json.JsonRowSerializationSchema.lambda$wrapIntoNullableConverter$1fa09b5b$1(JsonRowSerializationSchema.java:189)
at
org.apache.flink.formats.json.JsonRowSerializationSchema.lambda$assembleRowConverter$dd344700$1(JsonRowSerializationSchema.java:345)
at
org.apache.flink.formats.json.JsonRowSerializationSchema.lambda$wrapIntoNullableConverter$1fa09b5b$1(JsonRowSerializationSchema.java:189)
at
org.apache.flink.formats.json.JsonRowSerializationSchema.lambda$assembleRowConverter$dd344700$1(JsonRowSerializationSchema.java:345)
at
org.apache.flink.formats.json.JsonRowSerializationSchema.lambda$wrapIntoNullableConverter$1fa09b5b$1(JsonRowSerializationSchema.java:189)
at
org.apache.flink.formats.json.JsonRowSerializationSchema.serialize(JsonRowSerializationSchema.java:138)
... 38 more

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