AlterTableDropFeature Command¶

AlterTableDropFeature is an AlterTableCommand (Spark SQL) unary logical operator that represents ALTER TABLE DROP FEATURE SQL command in a logical query plan.

AlterTableDropFeature supports a single feature removal (by the feature name).

AlterTableDropFeature becomes an AlterTableDropFeatureDeltaCommand at execution time (when AbstractDeltaCatalog is requested to alter a table).

Creating Instance¶

AlterTableDropFeature takes the following to be created:

• Table (LogicalPlan)
• Name of the feature to drop
• truncateHistory flag

AlterTableDropFeature is created when:

• DeltaSqlAstBuilder is requested to parse ALTER TABLE DROP FEATURE SQL command

TableChanges¶

changes: Seq[TableChange]

changes is just a single DropFeature (for this name of the feature to drop and truncateHistory flag).