diff options
Diffstat (limited to 'src/include/access/tableam.h')
| -rw-r--r-- | src/include/access/tableam.h | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/src/include/access/tableam.h b/src/include/access/tableam.h index 51c370e6ca8..29371f4c479 100644 --- a/src/include/access/tableam.h +++ b/src/include/access/tableam.h @@ -256,9 +256,10 @@ typedef struct TableAmRoutine * needs be set to true by index_fetch_tuple, signalling to the caller * that index_fetch_tuple should be called again for the same tid. * - * *all_dead should be set to true by index_fetch_tuple iff it is - * guaranteed that no backend needs to see that tuple. Index AMs can use - * that do avoid returning that tid in future searches. + * *all_dead, if all_dead is not NULL, should be set to true if by + * index_fetch_tuple iff it is guaranteed that no backend needs to see + * that tuple. Index AMs can use that do avoid returning that tid in + * future searches. */ bool (*index_fetch_tuple) (struct IndexFetchTableData *scan, ItemPointer tid, @@ -594,9 +595,10 @@ table_index_fetch_end(struct IndexFetchTableData *scan) * will be set to true, signalling that table_index_fetch_tuple() should be called * again for the same tid. * - * *all_dead will be set to true by table_index_fetch_tuple() iff it is guaranteed - * that no backend needs to see that tuple. Index AMs can use that do avoid - * returning that tid in future searches. + * *all_dead, if all_dead is not NULL, will be set to true by + * table_index_fetch_tuple() iff it is guaranteed that no backend needs to see + * that tuple. Index AMs can use that do avoid returning that tid in future + * searches. * * The difference between this function and table_fetch_row_version is that * this function returns the currently visible version of a row if the AM @@ -618,6 +620,17 @@ table_index_fetch_tuple(struct IndexFetchTableData *scan, all_dead); } +/* + * This is a convenience wrapper around table_index_fetch_tuple() which + * returns whether there are table tuple items corresponding to an index + * entry. This likely is only useful to verify if there's a conflict in a + * unique index. + */ +extern bool table_index_fetch_tuple_check(Relation rel, + ItemPointer tid, + Snapshot snapshot, + bool *all_dead); + /* ------------------------------------------------------------------------ * Functions for non-modifying operations on individual tuples |