ListFindItem with StartingPosition out of reach: BUG
Hello
The index returned by ListFindItem is BAD when:
- StartingPosition = 0 (this is a wrong value: StartingPosition must be > = 1).
- The search value is equal to the LAST item inserted in the list:
The following code example shows the bug in the TEST_D:
int main (int argc, char *argv[])
{
ssize_t startingPosition = 0;
size_t index = 0;
int val = 0;
ListType myList = NULL;
myList = ListCreate (sizeof(int));
val = 1;
ListInsertItem (myList, &val, END_OF_LIST);
val = 2;
ListInsertItem (myList, &val, END_OF_LIST);
val = 3;
ListInsertItem (myList, &val, END_OF_LIST);
// TEST_A: OK
startingPosition = 1;
val = 1;
index = ListFindItem (myList, &val, startingPosition, IntCompare);
// index = 1 --> OK
// TEST_B: OK
startingPosition = 10; // WRONG value: startingPosition is over the number of items.
val = 1;
index = ListFindItem (myList, &val, startingPosition, IntCompare);
// index = 0 --> OK because startingPosition is out of range (>3)
// TEST_C: OK
startingPosition = 0; // WRONG value: startingPosition must be >= 1
val = 1;
index = ListFindItem (myList, &val, startingPosition, IntCompare);
// index = 0 --> OK because startingPosition is out of range (<1)
// TEST_D: NOT OK
startingPosition = 0; // WRONG value: startingPosition must be >= 1
val = 3; // value of the LAST ITEM inserted in the List
index = ListFindItem (myList, &val, startingPosition, IntCompare);
// index = 3 --> NOT OK: the behaviour is different compare to TEST_C.
// In this case, ListFindItem must return 0 (NOT 3) because startingPosition is out of range (<1).
// If you look for another item (not the last: val=1 ou val=2) ListFinfItem returns 0 --> OK
return 0;
}
Hello jm73,
The behavior you're seeing is planned. Please note that you can use the following two macros to specify the starting position: END_OF_LIST and FRONT_OF_LIST . Macros are defined as follows in toolbox.h :
#define FRONT_OF_LIST -1 /* Handy Constants that substitute for item positions */
#define END_OF_LIST 0 /* END_OF_LIST means one past current length of list when
inserting. Otherwise it refers the last item in the list. */
Specifying 0, you say the ListFindItem function to start looking at the end of the list, that is why, he finds the last item.
Tags: NI Software
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----------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1. 22. 1740 (0) | 00:00:01 |
| 1. TRANSFORMATION OF THE TEMPORARY TABLE. | | | | |
| 2. LOAD SELECT ACE | SYS_TEMP_0FD9D6810_5B8F6E67 | | | | |
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| 4. TABLE ACCESS FULL | MESSAGE_HIST | 1. 22. 70 (0) | 00:00:01 |
| 5. GLOBAL TRI | | 1. 22. | |
| 6. NESTED EXTERNAL LOOPS | | 800 | 17600 | 1670 (0) | 00:00:01 |
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|* 9 | VIEW | | 1. 22. 2 (0) | 00:00:01 |
| 10. TABLE ACCESS FULL | SYS_TEMP_0FD9D6810_5B8F6E67 | 1. 22. 2 (0) | 00:00:01 |
----------------------------------------------------------------------------------------------------------
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-edit
Not able to view a plan but you can invade the second join condition select and then the result of a subquery with a predicate according to your requirement. This should delay the or rating and leave only an equijoin (although rowsource return may be slightly larger than the opposite).
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OF message_hist salvation)
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/
--------------------------------------------------------------------------------------------------------
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--------------------------------------------------------------------------------------------------------
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| 1. TRANSFORMATION OF THE TEMPORARY TABLE. | | | | |
| 2. LOAD SELECT ACE | SYS_TEMP_0FD9D6605_28F27F | | | | |
| 3. COUNT | | | | | |
| 4. TABLE ACCESS FULL | MESSAGE_HIST | 150. 3300 | 2 (0) | 00:00:01 |
| 5. GLOBAL TRI | | 1. 66. | |
|* 6 | EXTERNAL RIGHT HASH JOIN | | 10497. 676K | 6 (0). 00:00:01 |
|* 7 | VIEW | | 150. 3300 | 2 (0) | 00:00:01 |
| 8. TABLE ACCESS FULL | SYS_TEMP_0FD9D6605_28F27F | 150. 3300 | 2 (0) | 00:00:01 |
|* 9 | OUTER HASH JOIN | | 328. 14432 | 4 (0) | 00:00:01 |
| 10. TABLE ACCESS FULL | MESSAGE | 200 | 4400 | 2 (0) | 00:00:01 |
| 11. VIEW | | 150. 3300 | 2 (0) | 00:00:01 |
| 12. TABLE ACCESS FULL | SYS_TEMP_0FD9D6605_28F27F | 150. 3300 | 2 (0) | 00:00:01 |
--------------------------------------------------------------------------------------------------------Information of predicates (identified by the operation identity card):
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7 - filter("H2".") UPDATE_DT "(+)<>
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