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Overview
| Comment: | Add VdbeModuleComment()s on the three main code generators for window functions. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: | f7c239e959004cb90dc8537ab2e1fca5 |
| User & Date: | drh 2018-07-10 22:24:14 |
Context
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2018-07-10
| ||
| 23:31 | Remove incorrect ALWAYS() macros from the window function logic. check-in: 94ac51cc user: drh tags: trunk | |
| 22:24 | Add VdbeModuleComment()s on the three main code generators for window functions. check-in: f7c239e9 user: drh tags: trunk | |
| 20:50 | Minor comment changes. Add ALWAYS() macros on some unreachable branches in the xStep() methods of built-in window functions. check-in: f2057542 user: drh tags: trunk | |
Changes
Changes to src/window.c.
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** windowCodeDefaultStep() is the only one of the three functions that
** does not cache each partition in a temp table before beginning to
** return rows.
*/
if( pMWin->eType==TK_ROWS
&& (pMWin->eStart!=TK_UNBOUNDED||pMWin->eEnd!=TK_CURRENT||!pMWin->pOrderBy)
){
windowCodeRowExprStep(pParse, p, pWInfo, regGosub, addrGosub);
}else{
Window *pWin;
int bCache = 0; /* True to use CacheStep() */
if( pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_UNBOUNDED ){
bCache = 1;
................................................................................
break;
}
}
}
/* Otherwise, call windowCodeDefaultStep(). */
if( bCache ){
windowCodeCacheStep(pParse, p, pWInfo, regGosub, addrGosub);
}else{
windowCodeDefaultStep(pParse, p, pWInfo, regGosub, addrGosub);
}
}
}
#endif /* SQLITE_OMIT_WINDOWFUNC */
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** windowCodeDefaultStep() is the only one of the three functions that
** does not cache each partition in a temp table before beginning to
** return rows.
*/
if( pMWin->eType==TK_ROWS
&& (pMWin->eStart!=TK_UNBOUNDED||pMWin->eEnd!=TK_CURRENT||!pMWin->pOrderBy)
){
VdbeModuleComment((pParse->pVdbe, "Begin RowExprStep()"));
windowCodeRowExprStep(pParse, p, pWInfo, regGosub, addrGosub);
}else{
Window *pWin;
int bCache = 0; /* True to use CacheStep() */
if( pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_UNBOUNDED ){
bCache = 1;
................................................................................
break;
}
}
}
/* Otherwise, call windowCodeDefaultStep(). */
if( bCache ){
VdbeModuleComment((pParse->pVdbe, "Begin CacheStep()"));
windowCodeCacheStep(pParse, p, pWInfo, regGosub, addrGosub);
}else{
VdbeModuleComment((pParse->pVdbe, "Begin DefaultStep()"));
windowCodeDefaultStep(pParse, p, pWInfo, regGosub, addrGosub);
}
}
}
#endif /* SQLITE_OMIT_WINDOWFUNC */
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