If you enable delta detection for a staging table,
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processes only new or changed records and ignores unchanged records. Records with null values or future dates in the columns that you select for delta detection are rejected by the staging process. In case of timeline-enabled base objects, if you run delta detection based on PERIOD_START_DATE or PERIOD_END_DATE columns, records with null values or future dates in the PERIOD_START_DATE or PERIOD_END_DATE columns are rejected.