![]() ![]() ![]() When you drop a column or field, you must drop dependent check constraints and generated columns. This option is only supported for identity columns on Delta Lake tables.ĭrop one or more columns or fields in a Delta Lake table. After this command, the next automatically assigned identity value will start from start + (n + 1) * step, where n is the smallest value that satisfies start + n * step >= max() (for a positive step). This option evaluates the state and updates the metadata to be consistent with the actual data. When you write your own values to an identity column, it might not comply with the metadata. Synchronize the metadata of an identity column with the actual data. This option is only supported for Delta Lake tables.ĭelta Lake will ensure the constraint is valid for all existing and new data. This clause is only supported if table_name is a Delta table.Ĭhanges the domain of valid column values to exclude nulls SET NOT NULL, or include nulls DROP NOT NULL. ![]() Moves the column from its current position to the front ( FIRST) or immediately AFTER the identifier. The fully qualified name of the field to be altered.Īll components of the path to the nested field must exist.Ĭhanges the description of the column_name column. User-defined aggregate functions - Scala.Handling large queries in interactive workflows.Transactional writes to cloud storage with DBIO.Databricks Runtime 6.4 Extended Support and Databricks Light 2.4 (Spark SQL 2.4).INSERT OVERWRITE DIRECTORY with Hive format.External locations and storage credentials.Databricks Runtime 7.x and above (Spark SQL 3.x). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |