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Initial infrastructure for recognizing DESC indices and being able to read

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and write older databases that specify DESC indices but do not really use
them.  Nothing is close to working yet. (CVS 2822)

FossilOrigin-Name: cd110aa225b09591064405dd8952b3df37278c52
This commit is contained in:
drh
2005-12-16 01:06:16 +00:00
parent fbfb60bc25
commit fdd6e85a34
9 changed files with 138 additions and 98 deletions
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29
src/alter.c
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@@ -12,7 +12,7 @@
** This file contains C code routines that used to generate VDBE code
** that implements the ALTER TABLE command.
**
** $Id: alter.c,v 1.11 2005/12/09 20:02:05 drh Exp $
** $Id: alter.c,v 1.12 2005/12/16 01:06:17 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -462,21 +462,28 @@ void sqlite3AlterFinishAddColumn(Parse *pParse, Token *pColDef){
** format to 2. If the default value of the new column is not NULL,
** the file format becomes 3.
*/
if( (v=sqlite3GetVdbe(pParse))!=0 ){
int f = (pDflt?3:2);
/* Only set the file format to $f if it is currently less than $f. */
sqlite3VdbeAddOp(v, OP_ReadCookie, iDb, 1);
sqlite3VdbeAddOp(v, OP_Integer, f, 0);
sqlite3VdbeAddOp(v, OP_Ge, 0, sqlite3VdbeCurrentAddr(v)+3);
sqlite3VdbeAddOp(v, OP_Integer, f, 0);
sqlite3VdbeAddOp(v, OP_SetCookie, iDb, 1);
}
sqlite3MinimumFileFormat(pParse, iDb, pDflt ? 3 : 2);
/* Reload the schema of the modified table. */
reloadTableSchema(pParse, pTab, pTab->zName);
}
/*
** Generate code to make sure the file format number is at least minFormat.
** The generated code will increase the file format number if necessary.
*/
void sqlite3MinimumFileFormat(Parse *pParse, int iDb, int minFormat){
Vdbe *v;
v = sqlite3GetVdbe(pParse);
if( v ){
sqlite3VdbeAddOp(v, OP_ReadCookie, iDb, 1);
sqlite3VdbeAddOp(v, OP_Integer, minFormat, 0);
sqlite3VdbeAddOp(v, OP_Ge, 0, sqlite3VdbeCurrentAddr(v)+3);
sqlite3VdbeAddOp(v, OP_Integer, minFormat, 0);
sqlite3VdbeAddOp(v, OP_SetCookie, iDb, 1);
}
}
/*
** This function is called by the parser after the table-name in