trait ResolverExtension extends AnyRef
The ResolverExtension is a main interface for single-pass analysis extensions in Catalyst. External code that needs specific node types to be resolved has to implement this trait and inject the implementation into the Analyzer.singlePassResolverExtensions.
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- abstract def resolveOperator(operator: LogicalPlan, resolver: TreeNodeResolver[LogicalPlan, LogicalPlan]): Option[LogicalPlan]
Resolve the operator if it's supported by this extension.
Resolve the operator if it's supported by this extension. This method is called by the single-pass Resolver on all the configured extensions when it exhausted its match list for the known node types.
- The implementation can rely on children being resolved.
- The implementation can introduce new unresolved subtrees, but has to invoke
resolveron them.
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(Since version 9)