# 2007 January 24
#
# 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 testing the INSERT transfer optimization.
#
# $Id: insert4.test,v 1.2 2007/02/24 13:53:05 drh Exp $

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

# The sqlite3_xferopt_count variable is incremented whenever the 
# insert transfer optimization applies.
#
# This procedure runs a test to see if the sqlite3_xferopt_count is
# set to N.
#
proc xferopt_test {testname N} {
  do_test $testname {set ::sqlite3_xferopt_count} $N
}

# Ticket #2252.  Make sure the an INSERT from identical tables
# does not violate constraints.
#
do_test insert4-1.1 {
  set sqlite3_xferopt_count 0
  execsql {
    CREATE TABLE t1(a int, b int, check(b>a));
    CREATE TABLE t2(x int, y int);
    INSERT INTO t2 VALUES(9,1);
  }
  catchsql {
    INSERT INTO t1 SELECT * FROM t2;
  }
} {1 {constraint failed}}
xferopt_test insert4-1.2 0
do_test insert4-1.3 {
  execsql {
    SELECT * FROM t1;
  }
} {}

# Tests to make sure that the transfer optimization is not occurring
# when it is not a valid optimization.
#
# The SELECT must be against a real table.
do_test insert4-2.1.1 {
  execsql {
    INSERT INTO t1 SELECT 4, 8;
    SELECT * FROM t1;
  }
} {4 8}
xferopt_test insert4-2.1.2  0
do_test insert4-2.2.1 {
  catchsql {
    DELETE FROM t1;
    CREATE VIEW v1 AS SELECT y, x FROM t2;
    INSERT INTO t1 SELECT * FROM v1;
    SELECT * FROM t1;
  }
} {0 {1 9}}
xferopt_test insert4-2.2.2 0

# Do not run the transfer optimization if there is a LIMIT clause
#
do_test insert4-2.3.1 {
  execsql {
    CREATE TABLE t3(a int, b int);
    INSERT INTO t2 SELECT y, x FROM t2;
    INSERT INTO t3 SELECT * FROM t2 LIMIT 1;
    SELECT * FROM t3;
  }
} {9 1}
xferopt_test insert4-2.3.2  0
do_test insert4-2.3.3 {
  catchsql {
    DELETE FROM t1;
    INSERT INTO t1 SELECT * FROM t2 LIMIT 1;
    SELECT * FROM t1;
  }
} {1 {constraint failed}}
xferopt_test insert4-2.3.4 0

# Do not run the transfer optimization if there is a DISTINCT
#
do_test insert4-2.4.1 {
  execsql {
    DELETE FROM t3;
    INSERT INTO t3 SELECT DISTINCT * FROM t2;
    SELECT * FROM t3;
  }
} {9 1 1 9}
xferopt_test insert4-2.4.2 0
do_test insert4-2.4.3 {
  catchsql {
    DELETE FROM t1;
    INSERT INTO t1 SELECT DISTINCT * FROM t2;
  }
} {1 {constraint failed}}
xferopt_test insert4-2.4.4 0

# Do run the transfer optimization if tables have identical
# CHECK constraints.
#
do_test insert4-3.1.1 {
  set sqlite3_xferopt_count 0
  execsql {
    DELETE FROM t1;
    INSERT INTO t1 VALUES(1,9);
    CREATE TABLE t4(m int, n int, CHECK(n>m));
    INSERT INTO t4 SELECT * FROM t1;
    SELECT * FROM t4;
  }
} {1 9}
xferopt_test insert4-3.1.2 1

finish_test