PreprocessTableUpdate Logical Resolution Rule¶

PreprocessTableUpdate is a post-hoc logical resolution rule (Rule[LogicalPlan]) to <> in a query plan into UpdateCommand.md[]s.

PreprocessTableUpdate is installed (injected) into a SparkSession using DeltaSparkSessionExtension.md[].

== [[creating-instance]][[conf]] Creating Instance

PreprocessTableUpdate takes a single SQLConf to be created.

PreprocessTableUpdate is created when DeltaSparkSessionExtension is requested to DeltaSparkSessionExtension.md#apply[register Delta SQL support].

== [[apply]] Executing Rule

[source, scala]¶

apply( plan: LogicalPlan): LogicalPlan

apply resolves (replaces) DeltaUpdateTable logical commands (in a logical query plan) into corresponding UpdateCommand.md[]s.

apply is part of the Spark SQL's Rule abstraction.