solve java.lang.ClassCastException

[huayucai]

What type of PR is this?

bug

What does this PR do / why do we need it:

when enable muti cordinator and use children resource groups, we encouter a ClassCastException of: io.prestosql.execution.resourcegroups.DistributedResourceGroupTemp cannot be cast to io.prestosql.execution.resourcegroups.InternalResourceGroup

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewers:

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6577030e | solve java.lang.ClassCastException

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