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Allow expressions like "<tbl>.rowid" to refer to implicit rowid columns of tables in nested FROM clauses.

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FossilOrigin-Name: 59a1bbc69f5dbb33418fa4b383393fb13a46bc1e531577da8ad54ae2fad5a10e
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dan
2023-09-15 18:36:51 +00:00
parent 581b229362
commit 81b70d97eb
7 changed files with 185 additions and 49 deletions
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21
src/expr.c
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@@ -2694,6 +2694,27 @@ int sqlite3IsRowid(const char *z){
return 0;
}
/*
** Return a pointer to a buffer containing a usable rowid alias for table
** pTab. An alias is usable if there is not an explicit user-defined column
** of the same name.
*/
const char *sqlite3RowidAlias(Table *pTab){
const char *azOpt[] = {"_ROWID_", "ROWID", "OID"};
int ii;
assert( VisibleRowid(pTab) );
for(ii=0; ii<ArraySize(azOpt); ii++){
int iCol;
for(iCol=0; iCol<pTab->nCol; iCol++){
if( sqlite3_stricmp(azOpt[ii], pTab->aCol[iCol].zCnName)==0 ) break;
}
if( iCol==pTab->nCol ){
return azOpt[ii];
}
}
return 0;
}
/*
** pX is the RHS of an IN operator. If pX is a SELECT statement
** that can be simplified to a direct table access, then return