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# 2007 Sep 12
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# This file is to test that ticket #2643 has been fixed.
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#
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# $Id: tkt2643.test,v 1.1 2007/09/13 17:54:41 drh Exp $
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#
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# The problem in ticket #2643 has to do with the query optimizer
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# making bad assumptions about index cost when data from ANALYZE
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# is available.
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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do_test tkt2643-1.1 {
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execsql {
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CREATE TABLE t1(a INTEGER PRIMARY KEY, b UNIQUE, c);
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INSERT INTO t1 VALUES(1,2,3);
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INSERT INTO t1 VALUES(2,3,4);
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ANALYZE;
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}
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db close
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sqlite3 db test.db
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execsql {
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CREATE INDEX i1 ON t1(c);
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SELECT count(*) FROM t1 WHERE c IS NOT NULL
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}
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} {2}
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finish_test
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