Interface ExecIndexRow
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- All Known Implementing Classes:
IndexRow
,IndexValueRow
public interface ExecIndexRow extends ExecRow
This is an extension of ExecRow for use with indexes and sorting.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description boolean
areNullsOrdered(int columnPosition)
Return true if orderedNulls was called on this ExecIndexRow for the given column position.void
execRowToExecIndexRow(ExecRow valueRow)
Turn the ExecRow into an ExecIndexRow.void
orderedNulls(int columnPosition)
These two methods are a sort of a hack.-
Methods inherited from interface org.apache.derby.iapi.sql.execute.ExecRow
cloneColumn, getClone, getClone, getNewNullRow, getNewObjectArray, getRowArray, getRowArrayClone, resetRowArray, setRowArray
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Method Detail
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orderedNulls
void orderedNulls(int columnPosition)
These two methods are a sort of a hack. The store implements ordered null semantics for start and stop positioning, which is correct for IS NULL and incorrect for everything else. To work around this, TableScanResultSet will check whether the start and stop positions have NULL in any column position other than for an IS NULL check. If so, it won't do the scan (that is, it will return no rows). This method is to inform this ExecIndexRow (which can be used for start and stop positioning) that the given column uses ordered null semantics.- Parameters:
columnPosition
- The position of the column that uses ordered null semantics (zero-based).
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areNullsOrdered
boolean areNullsOrdered(int columnPosition)
Return true if orderedNulls was called on this ExecIndexRow for the given column position.- Parameters:
columnPosition
- The position of the column (zero-based) for which we want to check if ordered null semantics are used.- Returns:
- true if we are to use ordered null semantics on the given column
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execRowToExecIndexRow
void execRowToExecIndexRow(ExecRow valueRow)
Turn the ExecRow into an ExecIndexRow.
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