diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/utils/sort/logtape.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/backend/utils/sort/logtape.c b/src/backend/utils/sort/logtape.c index caa6960b957..6cc06b24e0d 100644 --- a/src/backend/utils/sort/logtape.c +++ b/src/backend/utils/sort/logtape.c @@ -778,11 +778,16 @@ LogicalTapeRewind(LogicalTapeSet *lts, int tapenum, bool forWrite) datablocknum = ltsRewindFrozenIndirectBlock(lts, lt->indirect); } - /* Allocate a read buffer */ + /* Allocate a read buffer (unless the tape is empty) */ if (lt->buffer) pfree(lt->buffer); - lt->buffer = palloc(lt->read_buffer_size); - lt->buffer_size = lt->read_buffer_size; + lt->buffer = NULL; + lt->buffer_size = 0; + if (datablocknum != -1L) + { + lt->buffer = palloc(lt->read_buffer_size); + lt->buffer_size = lt->read_buffer_size; + } /* Read the first block, or reset if tape is empty */ lt->curBlockNumber = 0L; |