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https://issues.apache.org/jira/browse/CALCITE-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-4177:
---------------------------------
Summary: RelJson should throw if asked to deserialize a call to an unknown
operator (was: Throw exception when deserialize SqlOperator fails, do not
return null)
> RelJson should throw if asked to deserialize a call to an unknown operator
> --------------------------------------------------------------------------
>
> Key: CALCITE-4177
> URL: https://issues.apache.org/jira/browse/CALCITE-4177
> Project: Calcite
> Issue Type: Improvement
> Reporter: Wang Yanlin
> Assignee: Wang Yanlin
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.28.0
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> Currently, when deserialize a RexNode fails, calcite returns a null value,
> causing NPE in somewhere else. So we cannot get any information about the
> SqlOperator in the stacktrace. This makes it hard to determine the reason
> when deserialize a very long json string.
> {noformat}
> Caused by: java.lang.NullPointerException
> at java.util.Objects.requireNonNull(Objects.java:203)
> at
> org.apache.calcite.rel.core.AggregateCall.<init>(AggregateCall.java:98)
> at
> org.apache.calcite.rel.core.AggregateCall.create(AggregateCall.java:198)
> at
> org.apache.calcite.rel.externalize.RelJsonReader.toAggCall(RelJsonReader.java:289)
> at
> org.apache.calcite.rel.externalize.RelJsonReader.access$500(RelJsonReader.java:59)
> at
> org.apache.calcite.rel.externalize.RelJsonReader$2.getAggregateCalls(RelJsonReader.java:172)
> at org.apache.calcite.rel.core.Aggregate.<init>(Aggregate.java:220)
> at
> org.apache.calcite.rel.logical.LogicalAggregate.<init>(LogicalAggregate.java:105)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> at
> org.apache.calcite.rel.externalize.RelJsonReader.readRel(RelJsonReader.java:264)
> at
> org.apache.calcite.rel.externalize.RelJsonReader.readRels(RelJsonReader.java:91)
> at
> org.apache.calcite.rel.externalize.RelJsonReader.read(RelJsonReader.java:85)
> at
> org.apache.calcite.plan.RelWriterTest.lambda$deserializeAndDumpToTextFormat$6(RelWriterTest.java:894)
> at
> org.apache.calcite.tools.Frameworks.lambda$withPlanner$0(Frameworks.java:131)
> at
> org.apache.calcite.prepare.CalcitePrepareImpl.perform(CalcitePrepareImpl.java:914)
> at org.apache.calcite.tools.Frameworks.withPrepare(Frameworks.java:180)
> ... 67 more
> {noformat}
> Maybe it's better to throw exception instead of return null, adding the name,
> kind, and syntax in the error message
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