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Start of experimental implementation of SQL window functions. Does not yet

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work.

FossilOrigin-Name: 3781e520854808fe02ad3fe77dd11fc917448c58ff1fd79123289dd91937decd
This commit is contained in:
dan
2018-05-16 20:58:07 +00:00
parent f80bba9d8d
commit 86fb6e1738
19 changed files with 759 additions and 61 deletions
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28
src/expr.c
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@@ -1063,6 +1063,9 @@ static SQLITE_NOINLINE void sqlite3ExprDeleteNN(sqlite3 *db, Expr *p){
}else{
sqlite3ExprListDelete(db, p->x.pList);
}
if( !ExprHasProperty(p, EP_Reduced) ){
sqlite3WindowDelete(db, p->pWin);
}
}
if( ExprHasProperty(p, EP_MemToken) ) sqlite3DbFree(db, p->u.zToken);
if( !ExprHasProperty(p, EP_Static) ){
@@ -1305,6 +1308,24 @@ static With *withDup(sqlite3 *db, With *p){
# define withDup(x,y) 0
#endif
static Window *winDup(sqlite3 *db, Window *p){
Window *pNew = 0;
if( p ){
pNew = sqlite3DbMallocZero(db, sizeof(Window));
if( pNew ){
pNew->pFilter = sqlite3ExprDup(db, p->pFilter, 0);
pNew->pPartition = sqlite3ExprListDup(db, p->pPartition, 0);
pNew->pOrderBy = sqlite3ExprListDup(db, p->pOrderBy, 0);
pNew->eType = p->eType;
pNew->eEnd = p->eEnd;
pNew->eStart = p->eStart;
pNew->pStart = sqlite3ExprDup(db, pNew->pStart, 0);
pNew->pEnd = sqlite3ExprDup(db, pNew->pEnd, 0);
}
}
return pNew;
}
/*
** The following group of routines make deep copies of expressions,
** expression lists, ID lists, and select statements. The copies can
@@ -1469,6 +1490,7 @@ Select *sqlite3SelectDup(sqlite3 *db, Select *pDup, int flags){
pNew->addrOpenEphm[1] = -1;
pNew->nSelectRow = p->nSelectRow;
pNew->pWith = withDup(db, p->pWith);
pNew->pWin = winDup(db, p->pWin);
sqlite3SelectSetName(pNew, p->zSelName);
*pp = pNew;
pp = &pNew->pPrior;
@@ -3778,6 +3800,10 @@ expr_code_doover:
u8 enc = ENC(db); /* The text encoding used by this database */
CollSeq *pColl = 0; /* A collating sequence */
if( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) && pExpr->pWin ){
return pExpr->pWin->regResult;
}
if( ConstFactorOk(pParse) && sqlite3ExprIsConstantNotJoin(pExpr) ){
/* SQL functions can be expensive. So try to move constant functions
** out of the inner loop, even if that means an extra OP_Copy. */
@@ -3798,7 +3824,7 @@ expr_code_doover:
pDef = sqlite3FindFunction(db, "unknown", nFarg, enc, 0);
}
#endif
if( pDef==0 || pDef->xFinalize!=0 ){
if( pDef==0 /* || pDef->xFinalize!=0 */ ){
sqlite3ErrorMsg(pParse, "unknown function: %s()", zId);
break;
}