database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-08 14:02:16 +03:00
Code Activity

Defer loading result column values into registers on an ORDER BY LIMIT until

Browse Source 
we know that the LIMIT does not exclude the current row.

FossilOrigin-Name: ce4ef46058f4aaea6623a41255a2e4b69bb24f16a287391df48f6bacdb4c4989
This commit is contained in:
drh
2018-04-30 19:32:49 +00:00
parent b57e3ec5d8
commit bbd4ae5a2f
4 changed files with 139 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/sqliteInt.h
View File

@@ -2759,11 +2759,8 @@ struct Upsert {
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
**
** nLimit is set to -1 if there is no LIMIT clause. nOffset is set to 0.
** If there is a LIMIT clause, the parser sets nLimit to the value of the
** limit and nOffset to the value of the offset (or 0 if there is not
** offset). But later on, nLimit and nOffset become the memory locations
** in the VDBE that record the limit and offset counters.
** See the header comment on the computeLimitRegisters() routine for a
** detailed description of the meaning of the iLimit and iOffset fields.
**
** addrOpenEphm[] entries contain the address of OP_OpenEphemeral opcodes.
** These addresses must be stored so that we can go back and fill in