diff options
Diffstat (limited to 'src/include/utils/rel.h')
| -rw-r--r-- | src/include/utils/rel.h | 33 |
1 files changed, 14 insertions, 19 deletions
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h index 4b833c5018c..58cc3f7ea1a 100644 --- a/src/include/utils/rel.h +++ b/src/include/utils/rel.h @@ -84,20 +84,15 @@ typedef struct RelationData /* * rd_createSubid is the ID of the highest subtransaction the rel has * survived into; or zero if the rel was not created in the current top - * transaction. This can be now be relied on, whereas previously it - * could be "forgotten" in earlier releases. - * Likewise, rd_newRelfilenodeSubid is the ID of the highest - * subtransaction the relfilenode change has survived into, or zero if not - * changed in the current transaction (or we have forgotten changing it). - * rd_newRelfilenodeSubid can be forgotten when a relation has multiple - * new relfilenodes within a single transaction, with one of them occuring - * in a subsequently aborted subtransaction, e.g. - * BEGIN; - * TRUNCATE t; - * SAVEPOINT save; - * TRUNCATE t; - * ROLLBACK TO save; - * -- rd_newRelfilenode is now forgotten + * transaction. This can be now be relied on, whereas previously it could + * be "forgotten" in earlier releases. Likewise, rd_newRelfilenodeSubid is + * the ID of the highest subtransaction the relfilenode change has + * survived into, or zero if not changed in the current transaction (or we + * have forgotten changing it). rd_newRelfilenodeSubid can be forgotten + * when a relation has multiple new relfilenodes within a single + * transaction, with one of them occuring in a subsequently aborted + * subtransaction, e.g. BEGIN; TRUNCATE t; SAVEPOINT save; TRUNCATE t; + * ROLLBACK TO save; -- rd_newRelfilenode is now forgotten */ SubTransactionId rd_createSubid; /* rel was created in current xact */ SubTransactionId rd_newRelfilenodeSubid; /* new relfilenode assigned in @@ -162,7 +157,7 @@ typedef struct RelationData * foreign-table support * * rd_fdwroutine must point to a single memory chunk palloc'd in - * CacheMemoryContext. It will be freed and reset to NULL on a relcache + * CacheMemoryContext. It will be freed and reset to NULL on a relcache * reset. */ @@ -403,15 +398,15 @@ typedef struct StdRdOptions /* * RelationIsScannable - * Currently can only be false for a materialized view which has not been - * populated by its query. This is likely to get more complicated later, - * so use a macro which looks like a function. + * Currently can only be false for a materialized view which has not been + * populated by its query. This is likely to get more complicated later, + * so use a macro which looks like a function. */ #define RelationIsScannable(relation) ((relation)->rd_rel->relispopulated) /* * RelationIsPopulated - * Currently, we don't physically distinguish the "populated" and + * Currently, we don't physically distinguish the "populated" and * "scannable" properties of matviews, but that may change later. * Hence, use the appropriate one of these macros in code tests. */ |