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Overview
Comment:Prevent sub-queries with "LIMIT 0" from leaving an extra value on the vdbe stack. Also updates to fuzz.test. (CVS 3993)
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SHA1: b1d1b16e9857a1c05f60cf2ae15f5a534b0dd0ac
User & Date: danielk1977 2007-05-14 14:05:00
Context
2007-05-14
15:49
Fix a bug in "flattening" optimization. Occured if the parent of the flattened sub-query is also the parent of a sub-query that uses a compound op (i.e. UNION, INTERSECT etc.). (CVS 3994) check-in: 1c33829c user: danielk1977 tags: trunk
14:05
Prevent sub-queries with "LIMIT 0" from leaving an extra value on the vdbe stack. Also updates to fuzz.test. (CVS 3993) check-in: b1d1b16e user: danielk1977 tags: trunk
12:12
In the windows driver, reacquire the shared lock if an exclusive lock fails. Ticket #2354. (CVS 3992) check-in: fc489b53 user: drh tags: trunk
Changes
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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 1.345 2007/05/14 11:34:47 drh Exp $
*/
#include "sqliteInt.h"


/*
** Delete all the content of a Select structure but do not deallocate
** the select structure itself.
................................................................................
  if( p->pLimit ){
    p->iLimit = iLimit = pParse->nMem;
    pParse->nMem += 2;
    v = sqlite3GetVdbe(pParse);
    if( v==0 ) return;
    sqlite3ExprCode(pParse, p->pLimit);
    sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0);
    sqlite3VdbeAddOp(v, OP_MemStore, iLimit, 0);
    VdbeComment((v, "# LIMIT counter"));
    sqlite3VdbeAddOp(v, OP_IfMemZero, iLimit, iBreak);

  }
  if( p->pOffset ){
    p->iOffset = iOffset = pParse->nMem++;
    v = sqlite3GetVdbe(pParse);
    if( v==0 ) return;
    sqlite3ExprCode(pParse, p->pOffset);
    sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0);







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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 1.346 2007/05/14 14:05:00 danielk1977 Exp $
*/
#include "sqliteInt.h"


/*
** Delete all the content of a Select structure but do not deallocate
** the select structure itself.
................................................................................
  if( p->pLimit ){
    p->iLimit = iLimit = pParse->nMem;
    pParse->nMem += 2;
    v = sqlite3GetVdbe(pParse);
    if( v==0 ) return;
    sqlite3ExprCode(pParse, p->pLimit);
    sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0);
    sqlite3VdbeAddOp(v, OP_MemStore, iLimit, 1);
    VdbeComment((v, "# LIMIT counter"));
    sqlite3VdbeAddOp(v, OP_IfMemZero, iLimit, iBreak);
    sqlite3VdbeAddOp(v, OP_MemLoad, iLimit, 0);
  }
  if( p->pOffset ){
    p->iOffset = iOffset = pParse->nMem++;
    v = sqlite3GetVdbe(pParse);
    if( v==0 ) return;
    sqlite3ExprCode(pParse, p->pOffset);
    sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0);

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#    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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is generating semi-random strings of SQL
# (a.k.a. "fuzz") and sending it into the parser to try to generate
# errors.
#
# $Id: fuzz.test,v 1.7 2007/05/11 16:58:04 danielk1977 Exp $







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

set ::REPEATS 20
set ::REPEATS 5000

proc fuzz {TemplateList} {
  set n [llength $TemplateList]
  set i [expr {int(rand()*$n)}]
  return [uplevel 1 subst -novar [list [lindex $TemplateList $i]]]


}

# Fuzzy generation primitives:
#
#     Literal
#     UnaryOp
#     BinaryOp
................................................................................

# Return the complete text of an SQL expression.
#
set ::ExprDepth 0
proc Expr { {c {}} } {
  incr ::ExprDepth

  set TemplateList [concat $c {[Literal]}]
  if {$::ExprDepth < 5} {
    lappend TemplateList \
      {[Expr $c] [BinaryOp] [Expr $c]} \
      {[UnaryOp] [Expr $c]}            \
      {[Expr $c] ISNULL}               \
      {[Expr $c] NOTNULL}              \
      {CAST([Expr $c] AS blob)}        \
      {CAST([Expr $c] AS text)}        \
      {CAST([Expr $c] AS integer)}     \
      {CAST([Expr $c] AS real)}        \
      {abs([Expr])}                    \
      {coalesce([Expr], [Expr])}       \
      {hex([Expr])}                    \
      {length([Expr])}                 \
      {lower([Expr])}                  \
      {upper([Expr])}                  \
      {quote([Expr])}                  \
      {random()}                       \
      {randomblob(min(max([Expr],1), 500))}   \
      {typeof([Expr])}                 \
      {substr([Expr],[Expr],[Expr])}   \
      {CASE WHEN [Expr $c] THEN [Expr $c] ELSE [Expr $c] END}       \



      {[Literal]} {[Literal]} {[Literal]}
  }
  if {$::SelectDepth < 10} {
    lappend TemplateList \
      {([Select 1])}                       \
      {[Expr $c] IN ([Select 1])}          \
      {[Expr $c] NOT IN ([Select 1])}      \
................................................................................
#
set ::TableList [list]
proc Table {} {
  set TemplateList [concat sqlite_master $::TableList]
  fuzz $TemplateList
}














# Return a SELECT statement.
#













set ::SelectDepth 0
set ::ColumnList [list]
proc Select {{isExpr 0}} {
  incr ::SelectDepth


  set TemplateList {
      {SELECT [Expr]}
      {SELECT [Literal]}

  }









  if {$::SelectDepth < 5} {
    lappend TemplateList \

        {SELECT [Expr] FROM ([Select])}                \
        {SELECT [Expr $::ColumnList] FROM [Table]}     \







    if {0 == $isExpr} {
      lappend TemplateList                                         \
          {SELECT [Expr], [Expr] FROM ([Select]) ORDER BY [Expr]}  \
          {SELECT * FROM ([Select]) ORDER BY [Expr]}               \

          {SELECT * FROM [Table]}                                  \
          {SELECT * FROM [Table] WHERE [Expr $::ColumnList]}       \


{SELECT * FROM [Table],[Table] AS t2 WHERE [Expr $::ColumnList] LIMIT 1}


    }
  } 































  set res [fuzz $TemplateList]
  incr ::SelectDepth -1
  set res
}

# Generate and return a fuzzy INSERT statement.
#
................................................................................
    {[Update]}
    {[Insert]}
    {[Select]}
    {[Delete]}
  }
  fuzz $TemplateList
}









































########################################################################

set ::log [open fuzzy.log w]

# 
# Usage: do_fuzzy_test <testname> ?<options>?
# 
#     -template
#     -errorlist

#     
proc do_fuzzy_test {testname args} {
  set ::fuzzyopts(-errorlist) [list]

  array set ::fuzzyopts $args

  lappend ::fuzzyopts(-errorlist) {parser stack overflow} {ORDER BY column}




  for {set ii 0} {$ii < $::REPEATS} {incr ii} {
    do_test ${testname}.$ii {
      set ::sql [subst $::fuzzyopts(-template)]
      puts $::log $::sql
      flush $::log
      set rc [catch {execsql $::sql} msg]
      set e 1
      if {$rc} {
................................................................................
do_test fuzz-1.10 {
  # Bug in calculation of Parse.ckOffset causing an assert() 
  # to fail. Probably harmless.
  execsql {
    SELECT coalesce(1, substr( 1, 2, length('in' IN (SELECT 1))))
  }
} {1}



















#----------------------------------------------------------------
# Test some fuzzily generated expressions.
#
do_fuzzy_test fuzz-2 -template  { SELECT [Expr] }

do_test fuzz-3.1 {
................................................................................
do_test         fuzz-5.1 {execsql BEGIN} {}
do_fuzzy_test   fuzz-5.2 -template  {[Insert]} -errorlist table
integrity_check fuzz-5.2.integrity
do_test         fuzz-5.3 {execsql COMMIT} {}
integrity_check fuzz-5.4.integrity

#----------------------------------------------------------------
# Now that there is data in the datbase, run some more SELECT 
# statements
#
set ::ColumnList [list a b c]
set E {{no such col} {ambiguous column name}}
do_fuzzy_test fuzz-6.1 -template {[Select]} -errorlist $E

#----------------------------------------------------------------
................................................................................
#
set E {{no such col} {ambiguous column name} {table}}
do_test         fuzz-7.1 {execsql BEGIN} {}
do_fuzzy_test   fuzz-7.2 -template {[Statement]} -errorlist $E
integrity_check fuzz-7.3.integrity
do_test         fuzz-7.4 {execsql COMMIT} {}
integrity_check fuzz-7.5.integrity







close $::log
finish_test







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#    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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is generating semi-random strings of SQL
# (a.k.a. "fuzz") and sending it into the parser to try to 
# generate errors.
#
# The tests in this file are really about testing fuzzily generated
# SQL parse-trees. The majority of the fuzzily generated SQL is 
# valid as far as the parser is concerned. 
#
# The most complicated trees are for SELECT statements.
#
# $Id: fuzz.test,v 1.8 2007/05/14 14:05:00 danielk1977 Exp $

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

set ::REPEATS 20
# set ::REPEATS 5000

proc fuzz {TemplateList} {
  set n [llength $TemplateList]
  set i [expr {int(rand()*$n)}]
  set r [uplevel 1 subst -novar [list [lindex $TemplateList $i]]]

  string map {"\n" " "} $r
}

# Fuzzy generation primitives:
#
#     Literal
#     UnaryOp
#     BinaryOp
................................................................................

# Return the complete text of an SQL expression.
#
set ::ExprDepth 0
proc Expr { {c {}} } {
  incr ::ExprDepth

  set TemplateList [concat $c $c $c {[Literal]}]
  if {$::ExprDepth < 3} {
    lappend TemplateList \
      {[Expr $c] [BinaryOp] [Expr $c]}                              \
      {[UnaryOp] [Expr $c]}                                         \
      {[Expr $c] ISNULL}                                            \
      {[Expr $c] NOTNULL}                                           \
      {CAST([Expr $c] AS blob)}                                     \
      {CAST([Expr $c] AS text)}                                     \
      {CAST([Expr $c] AS integer)}                                  \
      {CAST([Expr $c] AS real)}                                     \
      {abs([Expr])}                                                 \
      {coalesce([Expr], [Expr])}                                    \
      {hex([Expr])}                                                 \
      {length([Expr])}                                              \
      {lower([Expr])}                                               \
      {upper([Expr])}                                               \
      {quote([Expr])}                                               \
      {random()}                                                    \
      {randomblob(min(max([Expr],1), 500))}                         \
      {typeof([Expr])}                                              \
      {substr([Expr],[Expr],[Expr])}                                \
      {CASE WHEN [Expr $c] THEN [Expr $c] ELSE [Expr $c] END}       \
      {[Literal]} {[Literal]} {[Literal]}                           \
      {[Literal]} {[Literal]} {[Literal]}                           \
      {[Literal]} {[Literal]} {[Literal]}                           \
      {[Literal]} {[Literal]} {[Literal]}
  }
  if {$::SelectDepth < 10} {
    lappend TemplateList \
      {([Select 1])}                       \
      {[Expr $c] IN ([Select 1])}          \
      {[Expr $c] NOT IN ([Select 1])}      \
................................................................................
#
set ::TableList [list]
proc Table {} {
  set TemplateList [concat sqlite_master $::TableList]
  fuzz $TemplateList
}

# Return one of:
#
#     "SELECT DISTINCT", "SELECT ALL" or "SELECT"
#
proc SelectKw {} {
  set TemplateList {
    "SELECT DISTINCT"
    "SELECT ALL"
    "SELECT"
  }
  fuzz $TemplateList
}

# Return a result set for a SELECT statement.
#
proc ResultSet {{nRes 0} {c ""}} {
  if {$nRes == 0} {
    set nRes [expr {rand()*2 + 1}]
  }

  set aRes [list]
  for {set ii 0} {$ii < $nRes} {incr ii} {
    lappend aRes [Expr $c]
  }

  join $aRes ", "
}

set ::SelectDepth 0
set ::ColumnList [list]


proc SimpleSelect {{nRes 0}} {

  set TemplateList {


      {[SelectKw] [ResultSet $nRes]}
  }

  # The ::SelectDepth variable contains the number of ancestor SELECT
  # statements (i.e. for a top level SELECT it is set to 0, for a
  # sub-select 1, for a sub-select of a sub-select 2 etc.).
  #
  # If this is already greater than 3, do not generate a complicated
  # SELECT statement. This tends to cause parser stack overflow (too
  # boring to bother with).
  #
  if {$::SelectDepth < 4} {
    lappend TemplateList \
        {[SelectKw] [ResultSet $nRes $::ColumnList] FROM ([Select])}     \
        {[SelectKw] [ResultSet $nRes] FROM ([Select])}                       \
        {[SelectKw] [ResultSet $nRes $::ColumnList] FROM [Table]}            \
        {
             [SelectKw] [ResultSet $nRes $::ColumnList] 
             FROM ([Select]) 
             GROUP BY [Expr]
             HAVING [Expr]
        }                                                                \

    if {0 == $nRes} {
      lappend TemplateList                                             \


          {[SelectKw] * FROM ([Select])}                               \
          {[SelectKw] * FROM [Table]}                                  \
          {[SelectKw] * FROM [Table] WHERE [Expr $::ColumnList]}       \
          {
             [SelectKw] * 
             FROM [Table],[Table] AS t2 
             WHERE [Expr $::ColumnList] 
          }                                                            \
    }
  } 

  fuzz $TemplateList
}

# Return a SELECT statement.
#
# If boolean parameter $isExpr is set to true, make sure the
# returned SELECT statement returns a single column of data.
#
proc Select {{nMulti 0}} {
  set TemplateList {
    {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} 
    {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} 
    {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} 
    {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} {[SimpleSelect $nMulti]} 
    {[SimpleSelect $nMulti] ORDER BY [Expr]}
    {[SimpleSelect $nMulti] ORDER BY [Expr] LIMIT [Expr] OFFSET [Expr]}
  }

  if {$::SelectDepth < 4} {
    if {$nMulti == 0} {
      set nMulti [expr {(rand()*2)+1}]
    }
    lappend TemplateList                                             \
        {[SimpleSelect $nMulti] UNION     [Select $nMulti]}          \
        {[SimpleSelect $nMulti] UNION ALL [Select $nMulti]}          \
        {[SimpleSelect $nMulti] EXCEPT    [Select $nMulti]}          \
        {[SimpleSelect $nMulti] INTERSECT [Select $nMulti]}
  }

  incr ::SelectDepth
  set res [fuzz $TemplateList]
  incr ::SelectDepth -1
  set res
}

# Generate and return a fuzzy INSERT statement.
#
................................................................................
    {[Update]}
    {[Insert]}
    {[Select]}
    {[Delete]}
  }
  fuzz $TemplateList
}

# Return an identifier. This just chooses randomly from a fixed set
# of strings.
proc Identifier {} {
  set TemplateList {
    This just chooses randomly a fixed 
    We would also thank the developers for their analysis Samba
  }

  fuzz $TemplateList
}

proc Check {} {
  set sd $::SelectDepth 
  set ::SelectDepth 500
  set TemplateList {
    {}
    {CHECK ([Expr])}
  }
  set res [fuzz $TemplateList]
  set ::SelectDepth $sd
  set res
}

proc Coltype {} {
  set TemplateList {
    {INTEGER PRIMARY KEY}
    {VARCHAR [Check]}
    {PRIMARY KEY}
  }
  fuzz $TemplateList
}

proc CreateTable {} {
  set TemplateList {
    {CREATE TABLE [Identifier]([Identifier] [Coltype], [Identifier] [Coltype])}
    {CREATE TEMP TABLE [Identifier]([Identifier] [Coltype])}
  }
  fuzz $TemplateList
}

########################################################################

set ::log [open fuzzy.log w]

#
# Usage: do_fuzzy_test <testname> ?<options>?
# 
#     -template
#     -errorlist
#     -repeats
#     
proc do_fuzzy_test {testname args} {
  set ::fuzzyopts(-errorlist) [list]
  set ::fuzzyopts(-repeats) $::REPEATS
  array set ::fuzzyopts $args

  lappend ::fuzzyopts(-errorlist) {parser stack overflow} 
  lappend ::fuzzyopts(-errorlist) {ORDER BY}
  lappend ::fuzzyopts(-errorlist) {GROUP BY}
  lappend ::fuzzyopts(-errorlist) {datatype mismatch}

  for {set ii 0} {$ii < $::fuzzyopts(-repeats)} {incr ii} {
    do_test ${testname}.$ii {
      set ::sql [subst $::fuzzyopts(-template)]
      puts $::log $::sql
      flush $::log
      set rc [catch {execsql $::sql} msg]
      set e 1
      if {$rc} {
................................................................................
do_test fuzz-1.10 {
  # Bug in calculation of Parse.ckOffset causing an assert() 
  # to fail. Probably harmless.
  execsql {
    SELECT coalesce(1, substr( 1, 2, length('in' IN (SELECT 1))))
  }
} {1}

do_test fuzz-1.11 {
  # The literals (A, B, C, D) are not important, they are just used
  # to make the EXPLAIN output easier to read.
  #
  # The problem here is that the EXISTS(...) expression leaves an
  # extra value on the VDBE stack. This is confusing the parent and
  # leads to an assert() failure when OP_Insert encounters an integer
  # when it expects a record blob.
  #
  # Update: Any query with (LIMIT 0) was leaking stack.
  #
  execsql {
    SELECT 'A' FROM (SELECT 'B') ORDER BY EXISTS (
      SELECT 'C' FROM (SELECT 'D' LIMIT 0)
    )
  }
} {A}

#----------------------------------------------------------------
# Test some fuzzily generated expressions.
#
do_fuzzy_test fuzz-2 -template  { SELECT [Expr] }

do_test fuzz-3.1 {
................................................................................
do_test         fuzz-5.1 {execsql BEGIN} {}
do_fuzzy_test   fuzz-5.2 -template  {[Insert]} -errorlist table
integrity_check fuzz-5.2.integrity
do_test         fuzz-5.3 {execsql COMMIT} {}
integrity_check fuzz-5.4.integrity

#----------------------------------------------------------------
# Now that there is data in the database, run some more SELECT 
# statements
#
set ::ColumnList [list a b c]
set E {{no such col} {ambiguous column name}}
do_fuzzy_test fuzz-6.1 -template {[Select]} -errorlist $E

#----------------------------------------------------------------
................................................................................
#
set E {{no such col} {ambiguous column name} {table}}
do_test         fuzz-7.1 {execsql BEGIN} {}
do_fuzzy_test   fuzz-7.2 -template {[Statement]} -errorlist $E
integrity_check fuzz-7.3.integrity
do_test         fuzz-7.4 {execsql COMMIT} {}
integrity_check fuzz-7.5.integrity

#----------------------------------------------------------------
# Many CREATE TABLE statements:
#
do_fuzzy_test   fuzz-8.1 -template {[CreateTable]} \
    -errorlist {table duplicate} -repeats 1000

close $::log
finish_test