Package io.trino.operator

Interface MergeRowChangeProcessor

All Known Implementing Classes:

ChangeOnlyUpdatedColumnsMergeProcessor, DeleteAndInsertMergeProcessor

public interface MergeRowChangeProcessor

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_CASE_OPERATION_NUMBER

Method Summary

Modifier and Type	Method	Description
Page	transformPage(Page inputPage)	Transform a page generated by an SQL MERGE operation into page of data columns and operations.

Field Details

DEFAULT_CASE_OPERATION_NUMBER

static final int DEFAULT_CASE_OPERATION_NUMBER

See Also:

• Constant Field Values

Method Details

transformPage

Page transformPage(Page inputPage)

Transform a page generated by an SQL MERGE operation into page of data columns and operations. The SQL MERGE input page consists of the following:

• The write redistribution columns, if any
• For partitioned or bucketed tables, a hash value column
• The rowId column for the row from the target table if matched, or null if not matched
• The merge case row block

The output page consists of the following:

• All data columns, in table column order
• The operation block
• The rowId block
• The last column in the resulting page is 1 if the row is an insert derived from an update, and zero otherwise.

The DeleteAndInsertMergeProcessor implementation will transform each UPDATE row into multiple rows: an INSERT row and a DELETE row.