AlterTable Logical Command¶

AlterTable is a Command for ALTER TABLE SQL commands:

• ALTER TABLE ADD COLUMNS
• ALTER TABLE REPLACE COLUMNS
• ALTER TABLE CHANGE COLUMN
• ALTER TABLE RENAME COLUMN
• ALTER TABLE DROP COLUMNS
• ALTER TABLE SET TBLPROPERTIES
• ALTER TABLE UNSET TBLPROPERTIES
• ALTER TABLE SET LOCATION

Creating Instance¶

AlterTable takes the following to be created:

• TableCatalog
• Identifier
• NamedRelation for the table
• TableChanges

AlterTable is created when:

• CatalogV2Util is requested to createAlterTable

Execution Planning¶

AlterTable is resolved to AlterTableExec by DataSourceV2Strategy execution planning strategy.