| java.lang.Object
 com.quadcap.sql.TempTable
com.quadcap.sql.TempTableMerge
| TempTableMerge | | public class TempTableMerge extends TempTable (Code) | | A special temp table used to implement UNION and INTERSECT
expressions.
The temp table that we build has keys based on the union columns,
and the data as 13 bytes:
| byte 0: | if zero, the rowId refers to a real table row
if one, the rowId refers to a temp row |
| bytes 1-8: | the rowId of the union row |
| bytes 9-12: | the duplicate count (from table 1) |
| bytes 13-16: | the duplicate count (from table 2) |
author:
Stan Bailes |
| Field Summary | |
| final static int | BUFSIZE
| | final static int | fCOUNT
The byte offset of the two 'count' integers. | | final static int | fIS_TEMP
Byte offset of 'isTemp' byte flag in a data row. | | final static int | fROW_ID
|
| Method Summary | |
| public void | addRows(Session session, Cursor cursor, int side, int[] map)
Add rows from one side of the {union/merge} operation, building a
temporary index on the key. | | final int | getCount(int side)
| | final static int | getCount(byte[] data, int side)
| | public byte[] | getData(byte[] key)
|
| BUFSIZE | | final static int BUFSIZE(Code) | | Total size of the data buffer in our temp index
|
| fCOUNT | | final static int fCOUNT(Code) | | The byte offset of the two 'count' integers. in the data row
|
| fIS_TEMP | | final static int fIS_TEMP(Code) | | Byte offset of 'isTemp' byte flag in a data row.
|
| fROW_ID | | final static int fROW_ID(Code) | | The byte offset of the (long) row ID in data data row
|
| addRows | | public void addRows(Session session, Cursor cursor, int side, int[] map) throws SQLException, IOException(Code) | | Add rows from one side of the {union/merge} operation, building a
temporary index on the key.
|
| getCount | | final int getCount(int side)(Code) | | |
| getCount | | final static int getCount(byte[] data, int side)(Code) | | |
|
|