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

Improved comments and function names. No logic changes.

Browse Source 
FossilOrigin-Name: 8f460b3b15bf4b88a224907d2f83e4ed6bf84d6b3f480008a1b187ea49c6ce1d
This commit is contained in:
drh
2022-10-17 14:46:39 +00:00
parent 08535840c6
commit e70d458340
5 changed files with 39 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/sqliteInt.h
View File

@@ -1189,7 +1189,7 @@ typedef struct FuncDef FuncDef;
typedef struct FuncDefHash FuncDefHash;
typedef struct IdList IdList;
typedef struct Index Index;
typedef struct IndexExpr IndexExpr;
typedef struct IndexedExpr IndexedExpr;
typedef struct IndexSample IndexSample;
typedef struct KeyClass KeyClass;
typedef struct KeyInfo KeyInfo;
@@ -2617,7 +2617,8 @@ struct Index {
unsigned bNoQuery:1; /* Do not use this index to optimize queries */
unsigned bAscKeyBug:1; /* True if the bba7b69f9849b5bf bug applies */
unsigned bHasVCol:1; /* Index references one or more VIRTUAL columns */
unsigned bHasExpr:1; /* This is an index on an expression */
unsigned bHasExpr:1; /* Index contains an expression, either a literal
** expression, or a reference to a VIRTUAL column */
#ifdef SQLITE_ENABLE_STAT4
int nSample; /* Number of elements in aSample[] */
int nSampleCol; /* Size of IndexSample.anEq[] and so on */
@@ -3566,21 +3567,22 @@ struct TriggerPrg {
#endif
/*
** If there is an index on an expression in scope such that the value
** of the expression pExpr can be read out of the index with cursor iCur
** at column iCol, then an instance of this object records that fact.
** For each index X that has as one of its arguments either an expression
** or the name of a virtual generated column, and if X is in scope such that
** the value of the expression can simply be read from the index, then
** there is an instance of this object on the Parse.pIdxExpr list.
**
** A linked list of these objects is attached to Parse and records all
** expressions that can be short-circuited by extracting a valid from
** an index.
** During code generation, while generating code to evaluate expressions,
** this list is consulted and if a matching expression is found, the value
** is read from the index rather than being recomputed.
*/
struct IndexExpr {
struct IndexedExpr {
Expr *pExpr; /* The expression contained in the index */
int iDataCur; /* The data cursor associated with the index */
int iIdxCur; /* The index cursor */
int iIdxCol; /* The column of the index that contains pExpr */
int iIdxCol; /* The index column that contains value of pExpr */
u8 bMaybeNullRow; /* True if we need an OP_IfNullRow check */
IndexExpr *pIENext; /* Next in a list of all indexed expressions */
IndexedExpr *pIENext; /* Next in a list of all indexed expressions */
};
/*
@@ -3641,7 +3643,7 @@ struct Parse {
int nLabelAlloc; /* Number of slots in aLabel */
int *aLabel; /* Space to hold the labels */
ExprList *pConstExpr;/* Constant expressions */
IndexExpr *pIdxExpr; /* List of all expression in active indexes */
IndexedExpr *pIdxExpr;/* List of expressions used by active indexes */
Token constraintName;/* Name of the constraint currently being parsed */
yDbMask writeMask; /* Start a write transaction on these databases */
yDbMask cookieMask; /* Bitmask of schema verified databases */