SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.226 2005/09/07 22:48:16 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Return the 'affinity' of the expression pExpr if any.
**

            }
            if( i>=pAggInfo->nColumn && (i = addAggInfoColumn(pAggInfo))>=0 ){
              pCol = &pAggInfo->aCol[i];
              pCol->iTable = pExpr->iTable;
              pCol->iColumn = pExpr->iColumn;
              pCol->iMem = pParse->nMem++;
              pCol->iSorterColumn = -1;
              pCol->pExpr = pExpr;
              if( pAggInfo->pGroupBy ){
                int j, n;
                ExprList *pGB = pAggInfo->pGroupBy;
                struct ExprList_item *pTerm = pGB->a;
                n = pGB->nExpr;
                for(j=0; j<n; j++, pTerm++){
                  Expr *pE = pTerm->pExpr;

**    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 1.263 2005/09/07 22:48:16 drh Exp $
*/
#include "sqliteInt.h"


/*
** Allocate a new Select structure and return a pointer to that
** structure.

** the current cursor position.
*/
static void updateAccumulator(Parse *pParse, AggInfo *pAggInfo){
  Vdbe *v = pParse->pVdbe;
  int i;
  struct AggInfo_func *pF;
  struct AggInfo_col *pC;


  pAggInfo->directMode = 1;
  for(i=0, pF=pAggInfo->aFunc; i<pAggInfo->nFunc; i++, pF++){
    int nArg;
    ExprList *pList = pF->pExpr->pList;
    if( pList ){
      nArg = pList->nExpr;

      if( !pColl ){
        pColl = pParse->db->pDfltColl;
      }
      sqlite3VdbeOp3(v, OP_CollSeq, 0, 0, (char *)pColl, P3_COLLSEQ);
    }
    sqlite3VdbeOp3(v, OP_AggStep, pF->iMem, nArg, (void*)pF->pFunc, P3_FUNCDEF);
  }



  for(i=0, pC=pAggInfo->aCol; i<pAggInfo->nAccumulator; i++, pC++){

    sqlite3ExprCode(pParse, pC->pExpr);
    sqlite3VdbeAddOp(v, OP_MemStore, pC->iMem, 1);
  }
  pAggInfo->directMode = 0;
}


/*

      */
      resetAccumulator(pParse, &sAggInfo);
      pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0);
      updateAccumulator(pParse, &sAggInfo);
      sqlite3WhereEnd(pWInfo);
      finalizeAggFunctions(pParse, &sAggInfo);
      pOrderBy = 0;
      if( pHaving ){
        sqlite3ExprIfFalse(pParse, pHaving, addrEnd, 1);
      }
      selectInnerLoop(pParse, p, p->pEList, 0, 0, 0, -1, 
                      eDest, iParm, addrEnd, addrEnd, aff);
    }
    sqlite3VdbeResolveLabel(v, addrEnd);
    
  } /* endif aggregate query */

/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.409 2005/09/07 22:48:16 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_

/*
** These #defines should enable >2GB file support on Posix if the
** underlying operating system supports it.  If the OS lacks

  ExprList *pGroupBy;     /* The group by clause */
  int nSortingColumn;     /* Number of columns in the sorting index */
  struct AggInfo_col {    /* For each column used in source tables */
    int iTable;              /* Cursor number of the source table */
    int iColumn;             /* Column number within the source table */
    int iSorterColumn;       /* Column number in the sorting index */
    int iMem;                /* Memory location that acts as accumulator */
    Expr *pExpr;             /* The original expression */
  } *aCol;
  int nColumn;            /* Number of used entries in aCol[] */
  int nColumnAlloc;       /* Number of slots allocated for aCol[] */
  int nAccumulator;       /* Number of columns that show through to the output.
                          ** Additional columns are used only as parameters to
                          ** aggregate functions */
  struct AggInfo_func {   /* For each aggregate function */

#
#*************************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing DISTINCT, UNION, INTERSECT and EXCEPT
# SELECT statements that use user-defined collation sequences. Also
# GROUP BY clauses that use user-defined collation sequences.
#
# $Id: collate5.test,v 1.5 2005/09/07 22:48:16 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl


#
# Tests are organised as follows:

    INSERT INTO collate5t1 VALUES('a', '1');
    INSERT INTO collate5t1 VALUES('A', '1.0');
    INSERT INTO collate5t1 VALUES('b', '2');
    INSERT INTO collate5t1 VALUES('B', '3');
  }
} {}
do_test collate5-4.1 {
  string tolower [execsql {
    SELECT a, count(*) FROM collate5t1 GROUP BY a;
  }]
} {a 2 b 2}
do_test collate5-4.2 {
  execsql {
    SELECT a, b, count(*) FROM collate5t1 GROUP BY a, b ORDER BY a, b;
  }
} {A 1.0 2 b 2 1 B 3 1}
do_test collate5-4.3 {
  execsql {
    DROP TABLE collate5t1;
  }
} {}

finish_test

#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for miscellanous features that were
# left out of other test files.
#
# $Id: misc4.test,v 1.18 2005/09/07 22:48:16 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Prepare a statement that will create a temporary table.  Then do
# a rollback.  Then try to execute the prepared statement.
#

    CREATE TABLE Table2(ID integer NOT NULL, Value TEXT);
    INSERT INTO Table2 VALUES(1, 'z');
    INSERT INTO Table2 VALUES (1, 'a');
    SELECT ID, Value FROM Table1
       UNION SELECT ID, max(Value) FROM Table2 GROUP BY 1
    ORDER BY 1, 2;
  }
} {1 x 1 z}
} ;# ifcapable compound

# Ticket #1047.  Make sure column types are preserved in subqueries.
#
ifcapable subquery {
  do_test misc4-4.1 {
    execsql {

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing aggregate functions and the
# GROUP BY and HAVING clauses of SELECT statements.
#
# $Id: select5.test,v 1.11 2005/09/07 22:48:16 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Build some test data
#
execsql {

    SELECT a, b FROM t2 GROUP BY a, b;
  } 
} {1 2 1 4 6 4}
do_test select5-5.5 {
  execsql {
    SELECT a, b FROM t2 GROUP BY a;
  } 
} {1 4 6 4}

finish_test

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing SELECT statements that contain
# subqueries in their FROM clause.
#
# $Id: select6.test,v 1.19 2005/09/07 22:48:16 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Omit this whole file if the library is build without subquery support.
ifcapable !subquery {
  finish_test

do_test select6-3.6 {
  execsql {
    SELECT a,b,a+b FROM (SELECT avg(x) as 'a', avg(y) as 'b' FROM t1)
    WHERE a>10
  }
} {10.5 3.7 14.2}
do_test select6-3.7 {
btree_breakpoint
  execsql {
    SELECT a,b,a+b FROM (SELECT avg(x) as 'a', avg(y) as 'b' FROM t1)
    WHERE a<10
  }
} {}
do_test select6-3.8 {
  execsql {