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Overview
| Comment: | Additional ".selecttrace" debugging output when the query is transformed from a DISTINCT into a GROUP BY. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
5a46914510af4d5557b299db65c68d5d |
| User & Date: | drh 2016-04-14 13:06:49 |
Context
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2016-04-14
| ||
| 13:16 | Since the return value of sqlite3OsClose() is always ignored, we might as well make it "void" instead of "int", and thereby save 50 bytes in the compiled binary. check-in: 7ee570e7 user: drh tags: trunk | |
| 13:06 | Additional ".selecttrace" debugging output when the query is transformed from a DISTINCT into a GROUP BY. check-in: 5a469145 user: drh tags: trunk | |
|
2016-04-13
| ||
| 21:00 | Fix compiler warnings by removing surplus local variables in the schema pretty-printer logic of the command-line shell. check-in: 55a62483 user: drh tags: trunk | |
Changes
Changes to src/select.c.
5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 |
){
p->selFlags &= ~SF_Distinct;
pGroupBy = p->pGroupBy = sqlite3ExprListDup(db, pEList, 0);
/* Notice that even thought SF_Distinct has been cleared from p->selFlags,
** the sDistinct.isTnct is still set. Hence, isTnct represents the
** original setting of the SF_Distinct flag, not the current setting */
assert( sDistinct.isTnct );
}
/* If there is an ORDER BY clause, then create an ephemeral index to
** do the sorting. But this sorting ephemeral index might end up
** being unused if the data can be extracted in pre-sorted order.
** If that is the case, then the OP_OpenEphemeral instruction will be
** changed to an OP_Noop once we figure out that the sorting index is
|
> > > > > > > |
5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 |
){
p->selFlags &= ~SF_Distinct;
pGroupBy = p->pGroupBy = sqlite3ExprListDup(db, pEList, 0);
/* Notice that even thought SF_Distinct has been cleared from p->selFlags,
** the sDistinct.isTnct is still set. Hence, isTnct represents the
** original setting of the SF_Distinct flag, not the current setting */
assert( sDistinct.isTnct );
#if SELECTTRACE_ENABLED
if( sqlite3SelectTrace & 0x400 ){
SELECTTRACE(0x400,pParse,p,("Transform DISTINCT into GROUP BY:\n"));
sqlite3TreeViewSelect(0, p, 0);
}
#endif
}
/* If there is an ORDER BY clause, then create an ephemeral index to
** do the sorting. But this sorting ephemeral index might end up
** being unused if the data can be extracted in pre-sorted order.
** If that is the case, then the OP_OpenEphemeral instruction will be
** changed to an OP_Noop once we figure out that the sorting index is
|