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+# 2007 Dec 12
+#
+# 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 contains test cases for stressing database
+# changes that involve side effects that delete rows from
+# the table being changed.  Ticket #2832 shows that in
+# older versions of SQLite that behavior was implemented
+# incorrectly and resulted in corrupt database files.
+#
+# $Id: sidedelete.test,v 1.2 2008/08/04 03:51:24 danielk1977 Exp $
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# The sequence table is created to store a sequence of integers
+# starting with 1.  This is used to reinitialize other tables
+# as part of other tests.
+#
+do_test sidedelete-1.1 {
+  execsql {
+    CREATE TABLE sequence(a INTEGER PRIMARY KEY);
+    INSERT INTO sequence VALUES(1);
+    INSERT INTO sequence VALUES(2);
+  }
+  for {set i 0} {$i<8} {incr i} {
+    execsql {
+      INSERT INTO sequence SELECT a+(SELECT max(a) FROM sequence) FROM sequence;
+    }
+  }
+  execsql {SELECT count(*) FROM sequence}
+} {512}
+
+# Make a series of changes using an UPDATE OR REPLACE and a
+# correlated subquery.  This would cause database corruption
+# prior to the fix for ticket #2832.
+#
+do_test sidedelete-2.0 {
+  execsql {
+    CREATE TABLE t1(a PRIMARY KEY, b);
+    CREATE TABLE chng(a PRIMARY KEY, b);
+    SELECT count(*) FROM t1;
+    SELECT count(*) FROM chng;
+  }
+} {0 0}
+for {set i 2} {$i<=100} {incr i} {
+  set n [expr {($i+2)/2}]
+  do_test sidedelete-2.$i.1 {
+    execsql {
+      DELETE FROM t1;
+      INSERT INTO t1 SELECT a, a FROM sequence WHERE a<=$i;
+      DELETE FROM chng;
+      INSERT INTO chng SELECT a*2, a*2+1 FROM sequence WHERE a<=$i/2;
+      UPDATE OR REPLACE t1 SET a=(SELECT b FROM chng WHERE a=t1.a);
+      SELECT count(*), sum(a) FROM t1;
+    }
+  } [list $n [expr {$n*$n-1}]]
+  integrity_check sidedelete-2.$i.2
+}
+
+# This will cause stacks leaks but not database corruption prior
+# to the #2832 fix.
+#
+do_test sidedelete-3.0 {
+  execsql {
+     DROP TABLE t1;
+     CREATE TABLE t1(a PRIMARY KEY);
+     SELECT * FROM t1;
+  }
+} {}
+for {set i 1} {$i<=100} {incr i} {
+  set n [expr {($i+1)/2}]
+  do_test sidedelete-3.$i.1 {
+    execsql {
+      DELETE FROM t1;
+      INSERT INTO t1 SELECT a FROM sequence WHERE a<=$i;
+      UPDATE OR REPLACE t1 SET a=a+1;
+      SELECT count(*), sum(a) FROM t1;
+    }
+  } [list $n [expr {$n*($n+1)}]]
+  integrity_check sidedelete-3.$i.2
+}
+
+finish_test