spark技术分享AlterViewAsCommand Logical Command
AlterViewAsCommand is a logical command for ALTER VIEW SQL statement to alter a view.
AlterViewAsCommand works with a table identifier (as TableIdentifier), the original SQL text, and a LogicalPlan for the SQL query.
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Note
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AlterViewAsCommand is described by alterViewQuery labeled alternative in statement expression in SqlBase.g4 and parsed using SparkSqlParser.
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When executed, AlterViewAsCommand attempts to alter a temporary view in the current SessionCatalog first, and if that “fails”, alters the permanent view.
Executing Logical Command — run Method
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run(session: SparkSession): Seq[Row] |
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Note
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run is part of RunnableCommand Contract to execute (run) a logical command.
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run…FIXME
