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third_party/sqlite/src/test/randexpr1.tcl

Index: third_party/sqlite/src/test/randexpr1.tcl
diff --git a/third_party/sqlite/src/test/randexpr1.tcl b/third_party/sqlite/src/test/randexpr1.tcl
new file mode 100644
index 0000000000000000000000000000000000000000..37ebf531e8509ebd61fa8498a1ab4f8b0e743977
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+++ b/third_party/sqlite/src/test/randexpr1.tcl
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+# Run this TCL script to generate thousands of test cases containing
+# complicated expressions.
+#
+# The generated tests are intended to verify expression evaluation
+# in SQLite against expression evaluation TCL.  
+#
+
+# Terms of the $intexpr list each contain two sub-terms.
+#
+#     *  An SQL expression template
+#     *  The equivalent TCL expression
+#
+# EXPR is replaced by an integer subexpression.  BOOL is replaced
+# by a boolean subexpression.
+#
+set intexpr {
+  {11 wide(11)}
+  {13 wide(13)}
+  {17 wide(17)}
+  {19 wide(19)}
+  {a $a}
+  {b $b}
+  {c $c}
+  {d $d}
+  {e $e}
+  {f $f}
+  {t1.a $a}
+  {t1.b $b}
+  {t1.c $c}
+  {t1.d $d}
+  {t1.e $e}
+  {t1.f $f}
+  {(EXPR) (EXPR)}
+  {{ -EXPR} {-EXPR}}
+  {+EXPR +EXPR}
+  {~EXPR ~EXPR}
+  {EXPR+EXPR EXPR+EXPR}
+  {EXPR-EXPR EXPR-EXPR}
+  {EXPR*EXPR EXPR*EXPR}
+  {EXPR+EXPR EXPR+EXPR}
+  {EXPR-EXPR EXPR-EXPR}
+  {EXPR*EXPR EXPR*EXPR}
+  {EXPR+EXPR EXPR+EXPR}
+  {EXPR-EXPR EXPR-EXPR}
+  {EXPR*EXPR EXPR*EXPR}
+  {{EXPR | EXPR} {EXPR | EXPR}}
+  {(abs(EXPR)/abs(EXPR)) (abs(EXPR)/abs(EXPR))}
+  {
+    {case when BOOL then EXPR else EXPR end}
+    {((BOOL)?EXPR:EXPR)}
+  }
+  {
+    {case when BOOL then EXPR when BOOL then EXPR else EXPR end}
+    {((BOOL)?EXPR:((BOOL)?EXPR:EXPR))}
+  }
+  {
+    {case EXPR when EXPR then EXPR else EXPR end}
+    {(((EXPR)==(EXPR))?EXPR:EXPR)}
+  }
+  {
+    {(select AGG from t1)}
+    {(AGG)}
+  }
+  {
+    {coalesce((select max(EXPR) from t1 where BOOL),EXPR)}
+    {[coalesce_subquery [expr {EXPR}] [expr {BOOL}] [expr {EXPR}]]}
+  }
+  {
+    {coalesce((select EXPR from t1 where BOOL),EXPR)}
+    {[coalesce_subquery [expr {EXPR}] [expr {BOOL}] [expr {EXPR}]]}
+  }
+}
+
+# The $boolexpr list contains terms that show both an SQL boolean
+# expression and its equivalent TCL.
+#
+set boolexpr {
+  {EXPR=EXPR   ((EXPR)==(EXPR))}
+  {EXPR<EXPR   ((EXPR)<(EXPR))}
+  {EXPR>EXPR   ((EXPR)>(EXPR))}
+  {EXPR<=EXPR  ((EXPR)<=(EXPR))}
+  {EXPR>=EXPR  ((EXPR)>=(EXPR))}
+  {EXPR<>EXPR  ((EXPR)!=(EXPR))}
+  {
+    {EXPR between EXPR and EXPR}
+    {[betweenop [expr {EXPR}] [expr {EXPR}] [expr {EXPR}]]}
+  }
+  {
+    {EXPR not between EXPR and EXPR}
+    {(![betweenop [expr {EXPR}] [expr {EXPR}] [expr {EXPR}]])}
+  }
+  {
+    {EXPR in (EXPR,EXPR,EXPR)}
+    {([inop [expr {EXPR}] [expr {EXPR}] [expr {EXPR}] [expr {EXPR}]])}
+  }
+  {
+    {EXPR not in (EXPR,EXPR,EXPR)}
+    {(![inop [expr {EXPR}] [expr {EXPR}] [expr {EXPR}] [expr {EXPR}]])}
+  }
+  {
+    {EXPR in (select EXPR from t1 union select EXPR from t1)}
+    {[inop [expr {EXPR}] [expr {EXPR}] [expr {EXPR}]]}
+  }
+  {
+    {EXPR in (select AGG from t1 union select AGG from t1)}
+    {[inop [expr {EXPR}] [expr {AGG}] [expr {AGG}]]}
+  }
+  {
+    {exists(select 1 from t1 where BOOL)}
+    {(BOOL)}
+  }
+  {
+    {not exists(select 1 from t1 where BOOL)}
+    {!(BOOL)}
+  }
+  {{not BOOL}  !BOOL}
+  {{BOOL and BOOL} {BOOL tcland BOOL}}
+  {{BOOL or BOOL}  {BOOL || BOOL}}
+  {{BOOL and BOOL} {BOOL tcland BOOL}}
+  {{BOOL or BOOL}  {BOOL || BOOL}}
+  {(BOOL) (BOOL)}
+  {(BOOL) (BOOL)}
+}
+
+# Aggregate expressions
+#
+set aggexpr {
+  {count(*) wide(1)}
+  {{count(distinct EXPR)} {[one {EXPR}]}}
+  {{cast(avg(EXPR) AS integer)} (EXPR)}
+  {min(EXPR) (EXPR)}
+  {max(EXPR) (EXPR)}
+  {(AGG) (AGG)}
+  {{ -AGG} {-AGG}}
+  {+AGG +AGG}
+  {~AGG ~AGG}
+  {abs(AGG)  abs(AGG)}
+  {AGG+AGG   AGG+AGG}
+  {AGG-AGG   AGG-AGG}
+  {AGG*AGG   AGG*AGG}
+  {{AGG | AGG}  {AGG | AGG}}
+  {
+    {case AGG when AGG then AGG else AGG end}
+    {(((AGG)==(AGG))?AGG:AGG)}
+  }
+}
+
+# Convert a string containing EXPR, AGG, and BOOL into a string
+# that contains nothing but X, Y, and Z.
+#
+proc extract_vars {a} {
+  regsub -all {EXPR} $a X a
+  regsub -all {AGG} $a Y a
+  regsub -all {BOOL} $a Z a
+  regsub -all {[^XYZ]} $a {} a
+  return $a
+}
+
+
+# Test all templates to make sure the number of EXPR, AGG, and BOOL
+# expressions match.
+#
+foreach term [concat $aggexpr $intexpr $boolexpr] {
+  foreach {a b} $term break
+  if {[extract_vars $a]!=[extract_vars $b]} {
+    error "mismatch: $term"
+  }
+}
+
+# Generate a random expression according to the templates given above.
+# If the argument is EXPR or omitted, then an integer expression is
+# generated.  If the argument is BOOL then a boolean expression is
+# produced.
+#
+proc generate_expr {{e EXPR}} {
+  set tcle $e
+  set ne [llength $::intexpr]
+  set nb [llength $::boolexpr]
+  set na [llength $::aggexpr]
+  set div 2
+  set mx 50
+  set i 0
+  while {1} {
+    set cnt 0
+    set re [lindex $::intexpr [expr {int(rand()*$ne)}]]
+    incr cnt [regsub {EXPR} $e [lindex $re 0] e]
+    regsub {EXPR} $tcle [lindex $re 1] tcle
+    set rb [lindex $::boolexpr [expr {int(rand()*$nb)}]]
+    incr cnt [regsub {BOOL} $e [lindex $rb 0] e]
+    regsub {BOOL} $tcle [lindex $rb 1] tcle
+    set ra [lindex $::aggexpr [expr {int(rand()*$na)}]]
+    incr cnt [regsub {AGG} $e [lindex $ra 0] e]
+    regsub {AGG} $tcle [lindex $ra 1] tcle
+
+    if {$cnt==0} break
+    incr i $cnt
+
+    set v1 [extract_vars $e]
+    if {$v1!=[extract_vars $tcle]} {
+      exit
+    }
+
+    if {$i+[string length $v1]>=$mx} {
+      set ne [expr {$ne/$div}]
+      set nb [expr {$nb/$div}]
+      set na [expr {$na/$div}]
+      set div 1
+      set mx [expr {$mx*1000}]
+    }
+  }
+  regsub -all { tcland } $tcle { \&\& } tcle
+  return [list $e $tcle]
+}
+
+# Implementation of routines used to implement the IN and BETWEEN
+# operators.
+proc inop {lhs args} {
+  foreach a $args {
+    if {$a==$lhs} {return 1}
+  }
+  return 0
+}
+proc betweenop {lhs first second} {
+  return [expr {$lhs>=$first && $lhs<=$second}]
+}
+proc coalesce_subquery {a b e} {
+  if {$b} {
+    return $a
+  } else {
+    return $e
+  }
+}
+proc one {args} {
+  return 1
+}
+
+# Begin generating the test script:
+#
+puts {# 2008 December 16
+#
+# 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.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.
+#
+# This file tests randomly generated SQL expressions.  The expressions
+# are generated by a TCL script.  The same TCL script also computes the
+# correct value of the expression.  So, from one point of view, this
+# file verifies the expression evaluation logic of SQLite against the
+# expression evaluation logic of TCL.
+#
+# An early version of this script is how bug #3541 was detected.
+#
+# $Id: randexpr1.tcl,v 1.1 2008/12/15 16:33:30 drh Exp $
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# Create test data
+#
+do_test randexpr1-1.1 {
+  db eval {
+    CREATE TABLE t1(a,b,c,d,e,f);
+    INSERT INTO t1 VALUES(100,200,300,400,500,600);
+    SELECT * FROM t1
+  }
+} {100 200 300 400 500 600}
+}
+
+# Test data for TCL evaluation.
+#
+set a [expr {wide(100)}]
+set b [expr {wide(200)}]
+set c [expr {wide(300)}]
+set d [expr {wide(400)}]
+set e [expr {wide(500)}]
+set f [expr {wide(600)}]
+
+# A procedure to generate a test case.
+#
+set tn 0
+proc make_test_case {sql result} {
+  global tn
+  incr tn
+  puts "do_test randexpr-2.$tn {\n  db eval {$sql}\n} {$result}"
+}
+
+# Generate many random test cases.
+#
+expr srand(0)
+for {set i 0} {$i<1000} {incr i} {
+  while {1} {
+    foreach {sqle tcle} [generate_expr EXPR] break;
+    if {[catch {expr $tcle} ans]} {
+      #puts stderr [list $tcle]
+      #puts stderr ans=$ans
+      if {![regexp {divide by zero} $ans]} exit
+      continue
+    }
+    set len [string length $sqle]
+    if {$len<100 || $len>2000} continue
+    if {[info exists seen($sqle)]} continue
+    set seen($sqle) 1
+    break
+  }
+  while {1} {
+    foreach {sqlb tclb} [generate_expr BOOL] break;
+    if {[catch {expr $tclb} bans]} {
+      #puts stderr [list $tclb]
+      #puts stderr bans=$bans
+      if {![regexp {divide by zero} $bans]} exit
+      continue
+    }
+    break
+  }
+  if {$bans} {
+    make_test_case "SELECT $sqle FROM t1 WHERE $sqlb" $ans
+    make_test_case "SELECT $sqle FROM t1 WHERE NOT ($sqlb)" {}
+  } else {
+    make_test_case "SELECT $sqle FROM t1 WHERE $sqlb" {}
+    make_test_case "SELECT $sqle FROM t1 WHERE NOT ($sqlb)" $ans
+  }
+  if {[regexp { \| } $sqle]} {
+    regsub -all { \| } $sqle { \& } sqle
+    regsub -all { \| } $tcle { \& } tcle
+    if {[catch {expr $tcle} ans]==0} {
+      if {$bans} {
+        make_test_case "SELECT $sqle FROM t1 WHERE $sqlb" $ans
+      } else {
+        make_test_case "SELECT $sqle FROM t1 WHERE NOT ($sqlb)" $ans
+      }
+    }
+  }
+}
+
+# Terminate the test script
+#
+puts {finish_test}