class ViewResolver extends TreeNodeResolver[View, View]
The ViewResolver resolves view plans that were already reconstructed by SessionCatalog from the view text and view metadata (schema, configs).
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- def conf: SQLConf
The active config object within the current scope.
The active config object within the current scope. See SQLConf.get for more information.
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- def getDefaultCollation: Option[String]
Get View's default collation if explicitly set.
- def getQueryContext(context: QueryContext): Array[QueryContext]
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- def getSummary(sqlContext: QueryContext): String
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- def resolve(unresolvedView: View): View
Resolve the
unresolvedViewand its underlying plan.Resolve the
unresolvedViewand its underlying plan. This method uses parent Resolver to resolve the view child. View resolution consists of the following steps:- Check if the single-pass resolver fully supports the view plan using the ResolverGuard. Throw ExplicitlyUnsupportedResolverFeature if the view plan is not supported.
- Set the ViewResolutionContext for the view plan resolution.
- Replace the necessary configurations in SQLConf with those that were stored with the view.
- Resolve the view plan using parent Resolver.
- Create a new CatalogTable description for the resolved view based on the original UnresolvedRelation.options, original CatalogTable description and used ViewResolutionContext.
- Return the resolved View with the resolved child and a new CatalogTable description.
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- ViewResolver → TreeNodeResolver
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- def withSQLConf[T](pairs: (String, String)*)(f: => T): T
Sets all SQL configurations specified in
pairs, callsf, and then restores all SQL configurations.Sets all SQL configurations specified in
pairs, callsf, and then restores all SQL configurations.- Attributes
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- def withSourceUnresolvedRelation(unresolvedRelation: UnresolvedRelation)(body: => LogicalPlan): LogicalPlan
This method preserves the resolved UnresolvedRelation for the further view resolution process.
This method preserves the resolved UnresolvedRelation for the further view resolution process.
sourceUnresolvedRelationStack is used to save the UnresolvedRelation after its resolution by Resolver.resolveRelation, since View that was produced from this UnresolvedRelation needs UnresolvedRelation.options for its resolution. We pop from the sourceUnresolvedRelationStack after the
bodyis executed. The stack is necessary, since withSourceUnresolvedRelation calls might be nested: UnresolvedRelation -> View ... UnresolvedRelation -> View ...
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- Deprecated
(Since version 9)