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object ViewHelper

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  1. final def !=(arg0: Any): Boolean
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  5. def checkCyclicViewReference(plan: LogicalPlan, path: Seq[TableIdentifier], viewIdent: TableIdentifier): Unit

    Recursively search the logical plan to detect cyclic view references, throw an AnalysisException if cycle detected.

    Recursively search the logical plan to detect cyclic view references, throw an AnalysisException if cycle detected.

    A cyclic view reference is a cycle of reference dependencies, for example, if the following statements are executed: CREATE VIEW testView AS SELECT id FROM tbl CREATE VIEW testView2 AS SELECT id FROM testView ALTER VIEW testView AS SELECT * FROM testView2 The view testView references testView2, and testView2 also references testView, therefore a reference cycle (testView -> testView2 -> testView) exists.

    plan

    the logical plan we detect cyclic view references from.

    path

    the path between the altered view and current node.

    viewIdent

    the table identifier of the altered view, we compare two views by the desc.identifier.

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  10. def generateViewProperties(properties: Map[String, String], session: SparkSession, analyzedPlan: LogicalPlan, fieldNames: Array[String]): Map[String, String]

    Generate the view properties in CatalogTable, including: 1.

    Generate the view properties in CatalogTable, including: 1. view default database that is used to provide the default database name on view resolution. 2. the output column names of the query that creates a view, this is used to map the output of the view child to the view output during view resolution.

    properties

    the properties in CatalogTable.

    session

    the spark session.

    analyzedPlan

    the analyzed logical plan that represents the child of a view.

    returns

    new view properties including view default database and query column names properties.

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