MergeSortInfo
public interface SortInfo
Modifier and Type | Method | Description |
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java.util.Properties |
getAllSortInfo(java.util.Properties prop) |
Return all information gathered about the sort.
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java.util.Properties getAllSortInfo(java.util.Properties prop) throws StandardException
This routine returns a list of properties which contains all information gathered about the sort. If a Property is passed in, then that property list is appended to, otherwise a new property object is created and returned.
Not all sorts may support all properties, if the property is not supported then it will not be returned. The following is a list of properties that may be returned: sortType - type of the sort being performed: internal external numRowsInput - the number of rows input to the sort. This number includes duplicates. numRowsOutput - the number of rows to be output by the sort. This number may be different from numRowsInput since duplicates may not be output. numMergeRuns - the number of merge runs for the sort. Applicable to external sorts only. Note: when a SortController is closed, numMergeRuns may increase by 1, to reflect the additional merge run that may be created for any data still in the sort buffer. mergeRunsSize - the size (number of rows) of each merge run for the sort. Applicable to external sorts only. e.g. [3,3,2] indicates 3 merge runs, where the first two runs have 3 rows each, and the last run has 2 rows. Note: when a SortController is closed, this vector may get an additional element, to reflect the additional merge run that may be created for any data still in the sort buffer. NOTE - this list will be expanded as more information about the sort is gathered and returned.
prop
- Property list to fill in.StandardException
- Standard exception policy.Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.