# 2007 Febuary 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.

 #

 # This file implements tests to verify that table column values

 # are pulled out of the database correctly.

 #

 # Long ago, the OP_Column opcode was sufficient to pull out the

 # value of a table column.  But then we added the ALTER TABLE ADD COLUMN

 # feature.  An added column might not actually exist in every row,

 # and so the OP_Column opcode has to contain a default value.  Later

 # still we added a feature whereby a REAL value with no fractional

 # part is stored in the database file as an integer to save space.

 # After extracting the value, we have to call OP_RealAffinity to

 # convert it back to a REAL.

 #

 # The sqlite3ExprCodeGetColumn() routine was added to take care of

 # all of the complications above.  The tests in this file attempt

 # to verify that sqlite3ExprCodeGetColumn() is used instead of a

 # raw OP_Column in all places where a table column is extracted from

 # the database.

 #

 # $Id: tkt2251.test,v 1.2 2007/09/12 17:01:45 danielk1977 Exp $

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 ifcapable !altertable {

   finish_test

   return

 }

 # Create sample data.  Verify that the default value and type of an added

 # column is correct for aggregates.

 do_test tkt2251-1.1 {

   execsql {

     CREATE TABLE t1(a INTEGER);

     INSERT INTO t1 VALUES(1);

     INSERT INTO t1 VALUES(1);

     INSERT INTO t1 VALUES(2);

     INSERT INTO t1 VALUES(9);

     INSERT INTO t1 VALUES(9);

     INSERT INTO t1 VALUES(9);

     INSERT INTO t1 VALUES(3);

     INSERT INTO t1 VALUES(2);

     ALTER TABLE t1 ADD COLUMN b REAL DEFAULT 4.0;

     SELECT avg(b), typeof(avg(b)) FROM t1;

   }

 } {4.0 real}

 do_test tkt2251-1.2 {

   execsql {

     SELECT sum(b), typeof(sum(b)) FROM t1;

   }

 } {32.0 real}

 do_test tkt2251-1.3 {

   execsql {

     SELECT a, sum(b), typeof(sum(b)) FROM t1 GROUP BY a ORDER BY a;

   }

 } {1 8.0 real 2 8.0 real 3 4.0 real 9 12.0 real}

 # Make sure that the REAL value comes out when values are accessed

 # by index.

 #

 do_test tkt2251-2.1 {

   execsql {

     SELECT b, typeof(b) FROM t1 WHERE a=3;

   }

 } {4.0 real}

 do_test tkt2251-2.2 {

   execsql {

     CREATE INDEX t1i1 ON t1(a,b);

     SELECT b, typeof(b) FROM t1 WHERE a=3;

   }

 } {4.0 real}

 do_test tkt2251-2.3 {

   execsql {

     REINDEX;

     SELECT b, typeof(b) FROM t1 WHERE a=3;

   }

 } {4.0 real}

 # Make sure the correct REAL value is used when copying from one

 # table to another.

 #

 do_test tkt2251-3.1 {

   execsql {

     CREATE TABLE t2(x,y);

     INSERT INTO t2 SELECT * FROM t1;

     SELECT y, typeof(y) FROM t2 WHERE x=3;

   }

 } {4.0 real}

 do_test tkt2251-3.2 {

   execsql {

     CREATE TABLE t3 AS SELECT * FROM t1;

     SELECT b, typeof(b) FROM t3 WHERE a=3;

   }

 } {4.0 real}

 finish_test