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Remove an incorrect NEVER() reported at

Browse Source 
[forum:/forumpost/5bbabfb7ce|forum post 5bbabfb7ce].  Also use this
opportunity to improve the isSimpleCount() function with better formatting,
an expanded header comment, and some extra assert() and textcase() macros.

FossilOrigin-Name: 2927185be81a5aa0dce70dd06040d05c2816a4d18b5094a6f709732cfd6968dc
This commit is contained in:
drh
2021-11-05 11:52:33 +00:00
parent 11e29677a2
commit a1c4c3c187
3 changed files with 27 additions and 15 deletions
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14
manifest
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@@ -1,5 +1,5 @@
C Fix\svacuum3.test\sso\sthat\sit\sworks\swith\sSQLITE_OMIT_ALTERTABLE\sbuilds.
D 2021-11-05T11:26:00.176
C Remove\san\sincorrect\sNEVER()\sreported\sat\n[forum:/forumpost/5bbabfb7ce|forum\spost\s5bbabfb7ce].\s\sAlso\suse\sthis\nopportunity\sto\simprove\sthe\sisSimpleCount()\sfunction\swith\sbetter\sformatting,\nan\sexpanded\sheader\scomment,\sand\ssome\sextra\sassert()\sand\stextcase()\smacros.
D 2021-11-05T11:52:33.612
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -549,7 +549,7 @@ F src/printf.c 5901672228f305f7d493cbc4e7d76a61a5caecdbc1cd06b1f9ec42ea4265cf8d
F src/random.c 097dc8b31b8fba5a9aca1697aeb9fd82078ec91be734c16bffda620ced7ab83c
F src/resolve.c ae65c88f5d0d4bc0052b203773d407efa2387c2bd6b202f87178006c7bb8632c
F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
F src/select.c 32d25b5af6c708aa63373c78c2e59681910387a7a78c08ec3086cadc77d41627
F src/select.c b4b3a0f32e70d93efbb357783846853dbd8b266ec0d7035aa0a245c33eecf72d
F src/shell.c.in f8854bcb0d14707d661732698d5210d7f01694000c46e8014b323ad18f575be6
F src/sqlite.h.in 99786216caf1c57aa3d70f95a7f84566dff6a9eeb50174799ea3b387eafd2a22
F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
@@ -1930,7 +1930,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P f474ac370accc5c780e7cb3e11c35f2b6104df929d3394a27db00c6b995e71b3
R d472d5f4c4a70c2b03acf7fb61015f81
U dan
Z 6ca495915fbad8bb4582199d2e90b2c0
P 07cca2fa891e9a60ea128a4b96ee407e9dd0f2b9e31fcffbfc2ac594a0e1ffe6
R 24f43c36076d7077b334333b0946f5fd
U drh
Z 57a888b10205bac6b59e83da3e3ff9b2

2
manifest.uuid
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@@ -1 +1 @@
07cca2fa891e9a60ea128a4b96ee407e9dd0f2b9e31fcffbfc2ac594a0e1ffe6
2927185be81a5aa0dce70dd06040d05c2816a4d18b5094a6f709732cfd6968dc

26
src/select.c
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@@ -4948,7 +4948,13 @@ static u8 minMaxQuery(sqlite3 *db, Expr *pFunc, ExprList **ppMinMax){
**
** where table is a database table, not a sub-select or view. If the query
** does match this pattern, then a pointer to the Table object representing
** <tbl> is returned. Otherwise, 0 is returned.
** <tbl> is returned. Otherwise, NULL is returned.
**
** This routine a condition for the count optimization. A correct answer
** is obtained (though perhaps more slowly) if this routine returns NULL when
** it could have returned a table pointer. But returning the pointer when
** NULL should have been returned can result in incorrect answers and/or
** crashes. So, when in doubt, return NULL.
*/
static Table *isSimpleCount(Select *p, AggInfo *pAggInfo){
Table *pTab;
@@ -4956,19 +4962,25 @@ static Table *isSimpleCount(Select *p, AggInfo *pAggInfo){
assert( !p->pGroupBy );
if( p->pWhere || p->pEList->nExpr!=1
|| p->pSrc->nSrc!=1 || p->pSrc->a[0].pSelect
if( p->pWhere
|| p->pEList->nExpr!=1
|| p->pSrc->nSrc!=1
|| p->pSrc->a[0].pSelect
|| pAggInfo->nFunc!=1
){
return 0;
}
pTab = p->pSrc->a[0].pTab;
assert( pTab!=0 );
assert( !IsView(pTab) );
if( !IsOrdinaryTable(pTab) ) return 0;
pExpr = p->pEList->a[0].pExpr;
assert( pTab && !IsView(pTab) && pExpr );
if( IsVirtual(pTab) ) return 0;
assert( pExpr!=0 );
if( pExpr->op!=TK_AGG_FUNCTION ) return 0;
if( NEVER(pAggInfo->nFunc==0) ) return 0;
if( (pAggInfo->aFunc[0].pFunc->funcFlags&SQLITE_FUNC_COUNT)==0 ) return 0;
assert( pAggInfo->aFunc[0].pFExpr==pExpr );
testcase( ExprHasProperty(pExpr, EP_Distinct) );
testcase( ExprHasProperty(pExpr, EP_WinFunc) );
if( ExprHasProperty(pExpr, EP_Distinct|EP_WinFunc) ) return 0;
return pTab;