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DescribeDeltaHistoryCommand is a RunnableCommand (Spark SQL) that uses DeltaHistoryManager for the commit history of a delta table.

DescribeDeltaHistoryCommand is used for DESCRIBE HISTORY SQL command.

Creating Instance

DescribeDeltaHistoryCommand takes the following to be created:

  • (optional) Directory
  • (optional) TableIdentifier
  • (optional) Number of commits to display
  • Output Attributes (default: CommitInfo)

DescribeDeltaHistoryCommand is created for:

Executing Command

  sparkSession: SparkSession): Seq[Row]

run is part of the RunnableCommand (Spark SQL) abstraction.

run creates a Hadoop Path to (the location of) the delta table (based on DeltaTableIdentifier).

run creates a DeltaLog for the delta table.

run requests the DeltaLog for the DeltaHistoryManager that is requested for the commit history.