| Modifier and Type | Field and Description |
|---|---|
| private long | pagenum_to_start_moving_rows
Fields of HeapScan |
| Access | Constructor and Description |
|---|---|
| public | HeapCompressScan()
The only constructor for a HeapCompressScan returns a scan in the closed state, the caller must call open. |
| pagenum_to_start_moving_rows | back to summary |
|---|---|
| private long pagenum_to_start_moving_rows Fields of HeapScan | |
| HeapCompressScan | back to summary |
|---|---|
| public HeapCompressScan() The only constructor for a HeapCompressScan returns a scan in the closed state, the caller must call open. | |
| fetchNextGroup | back to summary |
|---|---|
| public int fetchNextGroup(DataValueDescriptor[][] row_array, RowLocation[] old_rowloc_array, RowLocation[] new_rowloc_array) throws StandardException Overrides org. Implements org. Protected override implementation of routines in GenericController class: | |
| fetchRowsForCompress | back to summary |
|---|---|
| private int fetchRowsForCompress(DataValueDescriptor[][] row_array, RowLocation[] oldrowloc_array, RowLocation[] newrowloc_array) throws StandardException Fetch the next N rows from the table. Utility routine used by both fetchSet() and fetchNextGroup().
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| positionAfterThisPage | back to summary |
|---|---|
| private void positionAfterThisPage(RowPosition pos) throws StandardException Set scan position to just after current page. Used to set the position of the scan if a record handle is not avaliable. In this case current_rh will be set to null, and current_pageno will be set to the current page number. On resume of the scan, the scan will be set to just before the first row returned form a getNextPage(current_pageno) call. A positionAtResumeScan(scan_position) is necessary to continue the scan after this call.
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| positionAtResumeScan | back to summary |
|---|---|
| protected void positionAtResumeScan(RowPosition pos) throws StandardException Overrides org. Reposition the scan upon entering the fetchRows loop. Called upon entering fetchRows() while in the SCAN_INPROGRESS state. Do work necessary to look at rows in the current page of the scan. The default implementation uses a record handle to maintain a scan position. It will get the latch again on the current scan position and set the slot to the current record handle.
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| positionAtStartForForwardScan | back to summary |
|---|---|
| protected void positionAtStartForForwardScan(RowPosition pos) throws StandardException Overrides org. Move the scan from SCAN_INIT to SCAN_INPROGRESS. This routine is called to move the scan from SCAN_INIT to SCAN_INPROGRESS. Upon return from this routine it is expected that scan_position is set such that calling the generic scan loop will reach the first row of the scan. Note that this usually means setting the scan_postion to one before the 1st row to be returned.
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