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https://issues.apache.org/jira/browse/CALCITE-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976324#comment-16976324
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Julian Hyde commented on CALCITE-3511:
--------------------------------------
Why do you think that SqlNode should be serializable?
> Failed to serialize SqlNode to json string using jackson
> --------------------------------------------------------
>
> Key: CALCITE-3511
> URL: https://issues.apache.org/jira/browse/CALCITE-3511
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: groobyming
> Priority: Critical
> Labels: SqlNode, calcite, calcite-core, jackson, json
>
> Failed to serialize SqlNode to json string using jackson, Exception as
> follows：
> Caused by: java.lang.UnsupportedOperationException: class
> org.apache.calcite.sql.SqlSelectOperator: SELECT
> at org.apache.calcite.util.Util.needToImplement(Util.java:967)
> at
> org.apache.calcite.sql.SqlOperator.getOperandCountRange(SqlOperator.java:201)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:664)
> at
> com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:689)
> ... 32 more
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