AlterTableAddConstraint¶

AlterTableAddConstraint is an AlterTableCommand (Spark SQL) that represents ALTER TABLE ADD CONSTRAINT SQL command for CHECK constraints.

Creating Instance¶

AlterTableAddConstraint takes the following to be created:

• Table (LogicalPlan)
• Constraint Name
• Constraint SQL Expression (text)

AlterTableAddConstraint is created when:

• DeltaSqlAstBuilder is requested to parse ALTER TABLE ADD 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 AddConstraint (with the constraintName and expr).