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Allow WHERE terms to be pushed down into sub-queries that contain window functions, provided that the WHERE term is made up of entirely of constants and copies of expressions found in the PARTITION BY clauses of all window functions in the sub-query.

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FossilOrigin-Name: dac51f303bba1a0aac7768c688b0c134deb7641062cce2071d546f2d8f241dec
This commit is contained in:
dan
2021-02-22 20:56:13 +00:00
parent dee1cb3006
commit 903fdd4834
6 changed files with 246 additions and 25 deletions
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20
src/window.c
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@@ -1304,15 +1304,19 @@ void sqlite3WindowAttach(Parse *pParse, Expr *p, Window *pWin){
** SELECT, or (b) the windows already linked use a compatible window frame.
*/
void sqlite3WindowLink(Select *pSel, Window *pWin){
if( pSel!=0
&& (0==pSel->pWin || 0==sqlite3WindowCompare(0, pSel->pWin, pWin, 0))
){
pWin->pNextWin = pSel->pWin;
if( pSel->pWin ){
pSel->pWin->ppThis = &pWin->pNextWin;
if( pSel ){
if( 0==pSel->pWin || 0==sqlite3WindowCompare(0, pSel->pWin, pWin, 0) ){
pWin->pNextWin = pSel->pWin;
if( pSel->pWin ){
pSel->pWin->ppThis = &pWin->pNextWin;
}
pSel->pWin = pWin;
pWin->ppThis = &pSel->pWin;
}else{
if( sqlite3ExprListCompare(pWin->pPartition, pSel->pWin->pPartition,-1) ){
pSel->selFlags |= SF_MultiPart;
}
}
pSel->pWin = pWin;
pWin->ppThis = &pSel->pWin;
}
}