database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-21 02:52:47 +03:00
Code Activity

Further refactor of heapgettup and heapgettup_pagemode

Browse Source 
Backward and forward scans share much of the same page acquisition code.
Here we consolidate that code to reduce some duplication.

Additionally, add a new rs_coffset field to HeapScanDescData to track the
offset of the current tuple.  The new field fits nicely into the padding
between a bool and BlockNumber field and saves having to look at the last
returned tuple to figure out which offset we should be looking at for the
current tuple.

Author: Melanie Plageman
Reviewed-by: David Rowley
Discussion: https://postgr.es/m/CAAKRu_bvkhka0CZQun28KTqhuUh5ZqY=_T8QEqZqOL02rpi2bw@mail.gmail.com
This commit is contained in:
David Rowley
2023-02-03 11:48:39 +13:00
parent cdf6518ef0
commit f9bc34fcb6
2 changed files with 64 additions and 139 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
src/include/access/heapam.h
View File

@@ -57,6 +57,7 @@ typedef struct HeapScanDescData
/* scan current state */
bool rs_inited; /* false = scan not init'd yet */
OffsetNumber rs_coffset; /* current offset # in non-page-at-a-time mode */
BlockNumber rs_cblock; /* current block # in scan, if any */
Buffer rs_cbuf; /* current buffer in scan, if any */
/* NB: if rs_cbuf is not InvalidBuffer, we hold a pin on that buffer */