database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-11 01:42:22 +03:00
Code Activity

Enhance the IdList object to exist in a single memory allocation (rather than

Browse Source 
a separate allocate for the base object and the array of IDs).  Also permit
an IdList object to store an Expr pointer together with each name.

FossilOrigin-Name: 40f3c95871e6f40f287ef2756abafb8fc56dffdd0af69436e5c7d8e95022d94e
This commit is contained in:
drh
2022-04-15 15:47:14 +00:00
parent 358424aeff
commit a99e325468
7 changed files with 65 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/sqliteInt.h
View File

@@ -3038,13 +3038,25 @@ struct ExprList {
** If "a" is the k-th column of table "t", then IdList.a[0].idx==k.
*/
struct IdList {
int nId; /* Number of identifiers on the list */
u8 eU4; /* Which element of a.u4 is valid */
struct IdList_item {
char *zName; /* Name of the identifier */
int idx; /* Index in some Table.aCol[] of a column named zName */
} *a;
int nId; /* Number of identifiers on the list */
union {
int idx; /* Index in some Table.aCol[] of a column named zName */
Expr *pExpr; /* Expr to implement a USING variable */
} u4;
} a[1];
};
/*
** Allowed values for IdList.eType, which determines which value of the a.u4
** is valid.
*/
#define EU4_NONE 0 /* Does not use IdList.a.u4 */
#define EU4_IDX 1 /* Uses IdList.a.u4.idx */
#define EU4_EXPR 2 /* Uses IdList.a.u4.pExpr */
/*
** The SrcItem object represents a single term in the FROM clause of a query.
** The SrcList object is mostly an array of SrcItems.