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Experimental code that tries to put the computation of subqueries inside a

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subroutine, and reuse that subroutine if the same subquery is evaluated more
than once.  Current code does not work for CHECK constraints.

FossilOrigin-Name: 6c44838adbe5dc482bc010e91a6dd7a0f777c989f443dd600740d2c783208e0d
This commit is contained in:
drh
2018-12-24 02:34:49 +00:00
parent 85bcdce270
commit 2c04131ca7
7 changed files with 121 additions and 56 deletions
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9
src/sqliteInt.h
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@@ -2485,6 +2485,10 @@ struct Expr {
Table *pTab; /* TK_COLUMN: Table containing column. Can be NULL
** for a column of an index on an expression */
Window *pWin; /* TK_FUNCTION: Window definition for the func */
struct { /* TK_IN, TK_SELECT, and TK_EXISTS */
int iAddr; /* Subroutine entry address */
int regReturn; /* Register used to hold return address */
} sub;
} y;
};
@@ -2516,6 +2520,7 @@ struct Expr {
#define EP_Alias 0x400000 /* Is an alias for a result set column */
#define EP_Leaf 0x800000 /* Expr.pLeft, .pRight, .u.pSelect all NULL */
#define EP_WinFunc 0x1000000 /* TK_FUNCTION with Expr.y.pWin set */
#define EP_Subrtn 0x2000000 /* Uses Expr.y.sub. TK_IN, _SELECT, or _EXISTS */
/*
** The EP_Propagate mask is a set of properties that automatically propagate
@@ -4258,7 +4263,7 @@ void sqlite3AlterRenameColumn(Parse*, SrcList*, Token*, Token*);
int sqlite3GetToken(const unsigned char *, int *);
void sqlite3NestedParse(Parse*, const char*, ...);
void sqlite3ExpirePreparedStatements(sqlite3*, int);
void sqlite3CodeRhsOfIN(Parse*, Expr*, int);
void sqlite3CodeRhsOfIN(Parse*, Expr*, int, int);
int sqlite3CodeSubselect(Parse*, Expr*);
void sqlite3SelectPrep(Parse*, Select*, NameContext*);
void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p);
@@ -4511,7 +4516,7 @@ const char *sqlite3JournalModename(int);
#define IN_INDEX_NOOP_OK 0x0001 /* OK to return IN_INDEX_NOOP */
#define IN_INDEX_MEMBERSHIP 0x0002 /* IN operator used for membership test */
#define IN_INDEX_LOOP 0x0004 /* IN operator used as a loop */
int sqlite3FindInIndex(Parse *, Expr *, u32, int*, int*);
int sqlite3FindInIndex(Parse *, Expr *, u32, int*, int*, int*);
int sqlite3JournalOpen(sqlite3_vfs *, const char *, sqlite3_file *, int, int);
int sqlite3JournalSize(sqlite3_vfs *);