AlterTableDropConstraint¶

AlterTableDropConstraint is an AlterTableCommand (Spark SQL) for ALTER TABLE DROP CONSTRAINT SQL command for CHECK constraints.

Creating Instance¶

AlterTableDropConstraint takes the following to be created:

• Table (LogicalPlan)
• Constraint Name
• ifExists flag

AlterTableDropConstraint is created when:

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

Table Changes¶

changes: Seq[TableChange]

changes is part of the AlterTableCommand (Spark SQL) abstraction.

changes gives a single-element collection with an DropConstraint (with the constraintName and ifExists flag).