AlterTableDropFeatureDeltaCommand¶

AlterTableDropFeatureDeltaCommand is a LeafRunnableCommand (Spark SQL) logical operator that represents the following commands at execution:

• ALTER TABLE DROP FEATURE SQL command
• DeltaTable.dropFeatureSupport

AlterTableDropFeatureDeltaCommand is an AlterDeltaTableCommand.

AlterTableDropFeatureDeltaCommand is an IgnoreCachedData (Spark SQL) logical operator.

Creating Instance¶

AlterTableDropFeatureDeltaCommand takes the following to be created:

• DeltaTableV2
• Name of the feature to drop
• truncateHistory flag (default: false)

AlterTableDropFeatureDeltaCommand is created when:

• AbstractDeltaCatalog is requested to alter a table (with DropFeature table change)
• DeltaTable is requested to dropFeatureSupport

Execute Command¶

run(
  sparkSession: SparkSession): Seq[Row]

run...FIXME

executeDropFeatureWithHistoryTruncation¶

executeDropFeatureWithHistoryTruncation(
  sparkSession: SparkSession,
  removableFeature: TableFeature with RemovableFeature): Seq[Row]

executeDropFeatureWithHistoryTruncation...FIXME