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Overview
| Comment: | After code is generated for a subquery, delete the Select structure in order to force the temporary table to be used and to prevent the subquery from being evaluated a second time. Ticket #601. (CVS 1216) |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
1cff18868dab5f8ead8ed8d07e088d7f |
| User & Date: | drh 2004-02-09 14:37:50 |
Context
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2004-02-10
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| 01:54 | Allow SQLITE_PAGE_SIZE to be redefined on the compiler command-line. (CVS 1217) (check-in: 4c7bf714 user: drh tags: trunk) | |
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2004-02-09
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| 14:37 | After code is generated for a subquery, delete the Select structure in order to force the temporary table to be used and to prevent the subquery from being evaluated a second time. Ticket #601. (CVS 1216) (check-in: 1cff1886 user: drh tags: trunk) | |
| 14:35 | Add test case for ticket #601. (CVS 1215) (check-in: 096312da user: drh tags: trunk) | |
Changes
Changes to src/select.c.
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** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle SELECT statements in SQLite. ** ** $Id: select.c,v 1.150 2004/01/30 02:01:04 drh Exp $ */ #include "sqliteInt.h" /* ** Allocate a new Select structure and return a pointer to that ** structure. ................................................................................ /* Issue a null callback if that is what the user wants. */ if( eDest==SRT_Callback && (pParse->useCallback==0 || (pParse->db->flags & SQLITE_NullCallback)!=0) ){ sqliteVdbeAddOp(v, OP_NullCallback, pEList->nExpr, 0); } /* The SELECT was successfully coded. Set the return code to 0 ** to indicate no errors. */ rc = 0; /* Control jumps to here if an error is encountered above, or upon ** successful coding of the SELECT. */ select_end: sqliteAggregateInfoReset(pParse); return rc; } |
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** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains C code routines that are called by the parser ** to handle SELECT statements in SQLite. ** ** $Id: select.c,v 1.151 2004/02/09 14:37:50 drh Exp $ */ #include "sqliteInt.h" /* ** Allocate a new Select structure and return a pointer to that ** structure. ................................................................................ /* Issue a null callback if that is what the user wants. */ if( eDest==SRT_Callback && (pParse->useCallback==0 || (pParse->db->flags & SQLITE_NullCallback)!=0) ){ sqliteVdbeAddOp(v, OP_NullCallback, pEList->nExpr, 0); } /* If this was a subquery, we have now converted the subquery into a ** temporary table. So delete the subquery structure from the parent ** to prevent this subquery from being evaluated again and to force the ** the use of the temporary table. */ if( pParent ){ assert( pParent->pSrc->nSrc>parentTab ); assert( pParent->pSrc->a[parentTab].pSelect==p ); sqliteSelectDelete(p); pParent->pSrc->a[parentTab].pSelect = 0; } /* The SELECT was successfully coded. Set the return code to 0 ** to indicate no errors. */ rc = 0; /* Control jumps to here if an error is encountered above, or upon ** successful coding of the SELECT. */ select_end: sqliteAggregateInfoReset(pParse); return rc; } |