# 2005 July 22

#

# 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 for the ANALYZE command.

#

# $Id: analyze.test,v 1.9 2008/08/11 18:44:58 drh Exp $

set testdir [file dirname $argv0]

source $testdir/tester.tcl

# There is nothing to test if ANALYZE is disable for this build.

#

ifcapable {!analyze} {

  finish_test

  return

}

# Basic sanity checks.

#

do_test analyze-1.1 {

  catchsql {

    ANALYZE no_such_table

  }

} {1 {no such table: no_such_table}}

do_test analyze-1.2 {

  execsql {

    SELECT count(*) FROM sqlite_master WHERE name='sqlite_stat1'

  }

} {0}

do_test analyze-1.3 {

  catchsql {

    ANALYZE no_such_db.no_such_table

  }

} {1 {unknown database no_such_db}}

do_test analyze-1.4 {

  execsql {

    SELECT count(*) FROM sqlite_master WHERE name='sqlite_stat1'

  }

} {0}

do_test analyze-1.5.1 {

  catchsql {

    ANALYZE

  }

} {0 {}}

do_test analyze-1.5.2 {

  catchsql {

    PRAGMA empty_result_callbacks=1;

    ANALYZE

  }

} {0 {}}

do_test analyze-1.6 {

  execsql {

    SELECT count(*) FROM sqlite_master WHERE name='sqlite_stat1'

  }

} {1}

do_test analyze-1.6.2 {

  catchsql {

    CREATE INDEX stat1idx ON sqlite_stat1(idx);

  }

} {1 {table sqlite_stat1 may not be indexed}}

do_test analyze-1.6.3 {

  catchsql {

    CREATE INDEX main.stat1idx ON SQLite_stat1(idx);

  }

} {1 {table sqlite_stat1 may not be indexed}}

do_test analyze-1.7 {

  execsql {

    SELECT * FROM sqlite_stat1

  }

} {}

do_test analyze-1.8 {

  catchsql {

    ANALYZE main

  }

} {0 {}}

do_test analyze-1.9 {

  execsql {

    SELECT * FROM sqlite_stat1

  }

} {}

do_test analyze-1.10 {

  catchsql {

    CREATE TABLE t1(a,b);

    ANALYZE main.t1;

  }

} {0 {}}

do_test analyze-1.11 {

  execsql {

    SELECT * FROM sqlite_stat1

  }

} {}

do_test analyze-1.12 {

  catchsql {

    ANALYZE t1;

  }

} {0 {}}

do_test analyze-1.13 {

  execsql {

    SELECT * FROM sqlite_stat1

  }

} {}

# Create some indices that can be analyzed.  But do not yet add

# data.  Without data in the tables, no analysis is done.

#

do_test analyze-2.1 {

  execsql {

    CREATE INDEX t1i1 ON t1(a);

    ANALYZE main.t1;

    SELECT * FROM sqlite_stat1 ORDER BY idx;

  }

} {}

do_test analyze-2.2 {

  execsql {

    CREATE INDEX t1i2 ON t1(b);

    ANALYZE t1;

    SELECT * FROM sqlite_stat1 ORDER BY idx;

  }

} {}

do_test analyze-2.3 {

  execsql {

    CREATE INDEX t1i3 ON t1(a,b);

    ANALYZE main;

    SELECT * FROM sqlite_stat1 ORDER BY idx;

  }

} {}

# Start adding data to the table.  Verify that the analysis

# is done correctly.

#

do_test analyze-3.1 {

  execsql {

    INSERT INTO t1 VALUES(1,2);

    INSERT INTO t1 VALUES(1,3);

    ANALYZE main.t1;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t1i1 {2 2} t1i2 {2 1} t1i3 {2 2 1}}

do_test analyze-3.2 {

  execsql {

    INSERT INTO t1 VALUES(1,4);

    INSERT INTO t1 VALUES(1,5);

    ANALYZE t1;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t1i1 {4 4} t1i2 {4 1} t1i3 {4 4 1}}

do_test analyze-3.3 {

  execsql {

    INSERT INTO t1 VALUES(2,5);

    ANALYZE main;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t1i1 {5 3} t1i2 {5 2} t1i3 {5 3 1}}

do_test analyze-3.4 {

  execsql {

    CREATE TABLE t2 AS SELECT * FROM t1;

    CREATE INDEX t2i1 ON t2(a);

    CREATE INDEX t2i2 ON t2(b);

    CREATE INDEX t2i3 ON t2(a,b);

    ANALYZE;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t1i1 {5 3} t1i2 {5 2} t1i3 {5 3 1} t2i1 {5 3} t2i2 {5 2} t2i3 {5 3 1}}

do_test analyze-3.5 {

  execsql {

    DROP INDEX t2i3;

    ANALYZE t1;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t1i1 {5 3} t1i2 {5 2} t1i3 {5 3 1} t2i1 {5 3} t2i2 {5 2}}

do_test analyze-3.6 {

  execsql {

    ANALYZE t2;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t1i1 {5 3} t1i2 {5 2} t1i3 {5 3 1} t2i1 {5 3} t2i2 {5 2}}

do_test analyze-3.7 {

  execsql {

    DROP INDEX t2i2;

    ANALYZE t2;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t1i1 {5 3} t1i2 {5 2} t1i3 {5 3 1} t2i1 {5 3}}

do_test analyze-3.8 {

  execsql {

    CREATE TABLE t3 AS SELECT a, b, rowid AS c, 'hi' AS d FROM t1;

    CREATE INDEX t3i1 ON t3(a);

    CREATE INDEX t3i2 ON t3(a,b,c,d);

    CREATE INDEX t3i3 ON t3(d,b,c,a);

    DROP TABLE t1;

    DROP TABLE t2;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {}

do_test analyze-3.9 {

  execsql {

    ANALYZE;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t3i1 {5 3} t3i2 {5 3 1 1 1} t3i3 {5 5 2 1 1}}

do_test analyze-3.10 {

  execsql {

    CREATE TABLE [silly " name](a, b, c);

    CREATE INDEX 'foolish '' name' ON [silly " name](a, b);

    CREATE INDEX 'another foolish '' name' ON [silly " name](c);

    INSERT INTO [silly " name] VALUES(1, 2, 3);

    INSERT INTO [silly " name] VALUES(4, 5, 6);

    ANALYZE;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {{another foolish ' name} {2 1} {foolish ' name} {2 1 1} t3i1 {5 3} t3i2 {5 3 1 1 1} t3i3 {5 5 2 1 1}}

do_test analyze-3.11 {

  execsql {

    DROP INDEX "foolish ' name";

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {{another foolish ' name} {2 1} t3i1 {5 3} t3i2 {5 3 1 1 1} t3i3 {5 5 2 1 1}}

do_test analyze-3.11 {

  execsql {

    DROP TABLE "silly "" name";

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t3i1 {5 3} t3i2 {5 3 1 1 1} t3i3 {5 5 2 1 1}}

# Try corrupting the sqlite_stat1 table and make sure the

# database is still able to function.

#

do_test analyze-4.0 {

  sqlite3 db2 test.db

  db2 eval {

    CREATE TABLE t4(x,y,z);

    CREATE INDEX t4i1 ON t4(x);

    CREATE INDEX t4i2 ON t4(y);

    INSERT INTO t4 SELECT a,b,c FROM t3;

  }

  db2 close

  db close

  sqlite3 db test.db

  execsql {

    ANALYZE;

    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;

  }

} {t3i1 {5 3} t3i2 {5 3 1 1 1} t3i3 {5 5 2 1 1} t4i1 {5 3} t4i2 {5 2}}

do_test analyze-4.1 {

  execsql {

    PRAGMA writable_schema=on;

    INSERT INTO sqlite_stat1 VALUES(null,null,null);

    PRAGMA writable_schema=off;

  }

  db close

  sqlite3 db test.db

  execsql {

    SELECT * FROM t4 WHERE x=1234;

  }

} {}

do_test analyze-4.2 {

  execsql {

    PRAGMA writable_schema=on;

    DELETE FROM sqlite_stat1;

    INSERT INTO sqlite_stat1 VALUES('t4','t4i1','nonsense');

    INSERT INTO sqlite_stat1 VALUES('t4','t4i2','120897349817238741092873198273409187234918720394817209384710928374109827172901827349871928741910');

    PRAGMA writable_schema=off;

  }

  db close

  sqlite3 db test.db

  execsql {

    SELECT * FROM t4 WHERE x=1234;

  }

} {}

do_test analyze-4.3 {

  execsql {

    INSERT INTO sqlite_stat1 VALUES('t4','xyzzy','0 1 2 3');

  }

  db close

  sqlite3 db test.db

  execsql {

    SELECT * FROM t4 WHERE x=1234;

  }

} {}

# This test corrupts the database file so it must be the last test

# in the series.

#

do_test analyze-99.1 {

  execsql {

    PRAGMA writable_schema=on;

    UPDATE sqlite_master SET sql='nonsense' WHERE name='sqlite_stat1';

  }

  db close

  sqlite3 db test.db

  catchsql {

    ANALYZE

  }

} {1 {malformed database schema (sqlite_stat1) - near "nonsense": syntax error}}

finish_test