# 2007 May 10
#
# 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.  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 1.14 2007/05/30 10:36:47 danielk1977 Exp $

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

set ::REPEATS 5000

# If running quick.test, don't do so many iterations.
if {[info exists ::ISQUICK]} {
  if {$::ISQUICK} { set ::REPEATS 20 }
}

source $testdir/fuzz_common.tcl

#----------------------------------------------------------------
# These tests caused errors that were first caught by the tests
# in this file. They are still here.
do_test fuzz-1.1 {
  execsql {
    SELECT 'abc' LIKE X'ABCD';
  }
} {0}
do_test fuzz-1.2 {
  execsql {
    SELECT 'abc' LIKE zeroblob(10);
  }
} {0}
do_test fuzz-1.3 {
  execsql {
    SELECT zeroblob(10) LIKE 'abc';
  }
} {0}
do_test fuzz-1.4 {
  execsql {
    SELECT (- -21) % NOT (456 LIKE zeroblob(10));
  }
} {0}
do_test fuzz-1.5 {
  execsql {
    SELECT (SELECT (
        SELECT (SELECT -2147483648) FROM (SELECT 1) ORDER BY 1
    ))
  }
} {-2147483648}
do_test fuzz-1.6 {
  execsql {
    SELECT 'abc', zeroblob(1) FROM (SELECT 1) ORDER BY 1
  }
} [execsql {SELECT 'abc', zeroblob(1)}]

do_test fuzz-1.7 {
  execsql {
    SELECT ( SELECT zeroblob(1000) FROM ( 
      SELECT * FROM (SELECT 'first') ORDER BY NOT 'in') 
    )
  }
} [execsql {SELECT zeroblob(1000)}]

do_test fuzz-1.8 {
  # Problems with opcode OP_ToText (did not account for MEM_Zero).
  # Also MemExpandBlob() was marking expanded blobs as nul-terminated.
  # They are not.
  execsql {
    SELECT CAST(zeroblob(1000) AS text);
  }
} {{}}

do_test fuzz-1.9 {
  # This was causing a NULL pointer dereference of Expr.pList.
  execsql {
    SELECT 1 FROM (SELECT * FROM sqlite_master WHERE random())
  }
} {}

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}

do_test fuzz-1.12.1 {
  # Create a table with a single row.
  execsql {
    CREATE TABLE abc(b);
    INSERT INTO abc VALUES('ABCDE');
  }

  # The following query was crashing. The later subquery (in the FROM)
  # clause was flattened into the parent, but the code was not repairng
  # the "b" reference in the other sub-query. When the query was executed,
  # that "b" refered to a non-existant vdbe table-cursor.
  #
  execsql {
    SELECT 1 IN ( SELECT b UNION SELECT 1 ) FROM (SELECT b FROM abc);
  }
} {1}
do_test fuzz-1.12.2 {
  # Clean up after the previous query.
  execsql {
    DROP TABLE abc;
  }
} {}


do_test fuzz-1.13 {
  # The problem here was that when there were more expressions in
  # the ORDER BY list than the result-set list. The temporary b-tree
  # used for sorting was being misconfigured in this case.
  #
  execsql {
    SELECT 'abcd' UNION SELECT 'efgh' ORDER BY 1 ASC, 1 ASC;
  }
} {abcd efgh}

do_test fuzz-1.14.1 {
  execsql {
    CREATE TABLE abc(a, b, c);
    INSERT INTO abc VALUES(123, 456, 789);
  }
 
  # The [a] reference in the sub-select was causing a problem. Because
  # the internal walkSelectExpr() function was not considering compound
  # SELECT operators.
  execsql {
    SELECT 1 FROM abc
    GROUP BY c HAVING EXISTS (SELECT a UNION SELECT 123);
  }
} {1}
do_test fuzz-1.14.2 {
  execsql {
    DROP TABLE abc;
  }
} {}

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

do_test fuzz-3.1 {
  execsql {
    CREATE TABLE abc(a, b, c);
    CREATE TABLE def(a, b, c);
    CREATE TABLE ghi(a, b, c);
  }
} {}
set ::TableList  [list abc def ghi]

#----------------------------------------------------------------
# Test some fuzzily generated SELECT statements.
#
do_fuzzy_test fuzz-3.2 -template  {[Select]}

#----------------------------------------------------------------
# Insert a small amount of data into the database and then run 
# some more generated SELECT statements.
#
do_test fuzz-4.1 {
  execsql {
    INSERT INTO abc VALUES(1, 2, 3);
    INSERT INTO abc VALUES(4, 5, 6);
    INSERT INTO abc VALUES(7, 8, 9);
    INSERT INTO def VALUES(1, 2, 3);
    INSERT INTO def VALUES(4, 5, 6);
    INSERT INTO def VALUES(7, 8, 9);
    INSERT INTO ghi VALUES(1, 2, 3);
    INSERT INTO ghi VALUES(4, 5, 6);
    INSERT INTO ghi VALUES(7, 8, 9);
    CREATE INDEX abc_i ON abc(a, b, c);
    CREATE INDEX def_i ON def(c, a, b);
    CREATE INDEX ghi_i ON ghi(b, c, a);
  }
} {}
do_fuzzy_test fuzz-4.2 -template {[Select]}

#----------------------------------------------------------------
# Test some fuzzy INSERT statements:
#
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

#----------------------------------------------------------------
# Run some SELECTs, INSERTs, UPDATEs and DELETEs in a transaction.
#
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 and DROP TABLE statements:
#
set E [list table duplicate {no such col} {ambiguous column name} {use DROP}]
do_fuzzy_test fuzz-8.1 -template {[CreateOrDropTableOrView]} -errorlist $E

close $::log
finish_test