WebSVN – wasCSharpSQLite – Blame – Rev 1

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office

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# 2011 January 04

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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 implements regression tests for SQLite library. This file

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# implements tests for ANALYZE to verify that multiple rows containing

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# a NULL value count as distinct rows for the purposes of analyze

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# statistics.

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#

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# Also include test cases for collating sequences on indices.

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#

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set testdir [file dirname $argv0]

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source $testdir/tester.tcl

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do_test analyze4-1.0 {

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db eval {

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CREATE TABLE t1(a,b);

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CREATE INDEX t1a ON t1(a);

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CREATE INDEX t1b ON t1(b);

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INSERT INTO t1 VALUES(1,NULL);

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INSERT INTO t1 SELECT a+1, b FROM t1;

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INSERT INTO t1 SELECT a+2, b FROM t1;

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INSERT INTO t1 SELECT a+4, b FROM t1;

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INSERT INTO t1 SELECT a+8, b FROM t1;

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INSERT INTO t1 SELECT a+16, b FROM t1;

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INSERT INTO t1 SELECT a+32, b FROM t1;

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INSERT INTO t1 SELECT a+64, b FROM t1;

ANALYZE;

}

# Should choose the t1a index since it is more specific than t1b.

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db eval {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=5 AND b IS NULL}

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} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}

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# Verify that the t1b index shows that it does not narrow down the

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# search any at all.

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#

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do_test analyze4-1.1 {

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db eval {

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SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx;

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}

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} {t1a {128 1} t1b {128 128}}

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# Change half of the b values from NULL to a constant. Verify

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# that the number of rows selected in stat1 is half the total

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# number of rows.

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#

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do_test analyze4-1.2 {

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db eval {

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UPDATE t1 SET b='x' WHERE a%2;

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ANALYZE;

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SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx;

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}

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} {t1a {128 1} t1b {128 64}}

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# Change the t1.b values all back to NULL. Add columns t1.c and t1.d.

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# Create a multi-column indices using t1.b and verify that ANALYZE

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# processes them correctly.

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#

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do_test analyze4-1.3 {

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db eval {

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UPDATE t1 SET b=NULL;

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ALTER TABLE t1 ADD COLUMN c;

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ALTER TABLE t1 ADD COLUMN d;

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UPDATE t1 SET c=a/4, d=a/2;

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CREATE INDEX t1bcd ON t1(b,c,d);

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CREATE INDEX t1cdb ON t1(c,d,b);

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CREATE INDEX t1cbd ON t1(c,b,d);

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ANALYZE;

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SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx;

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}

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} {t1a {128 1} t1b {128 128} t1bcd {128 128 4 2} t1cbd {128 4 4 2} t1cdb {128 4 2 2}}

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# Verify that collating sequences are taken into account when computing

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# ANALYZE statistics.

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#

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do_test analyze4-2.0 {

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db eval {

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CREATE TABLE t2(

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x INTEGER PRIMARY KEY,

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a TEXT COLLATE nocase,

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b TEXT COLLATE rtrim,

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c TEXT COLLATE binary

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);

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CREATE INDEX t2a ON t2(a);

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CREATE INDEX t2b ON t2(b);

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CREATE INDEX t2c ON t2(c);

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CREATE INDEX t2c2 ON t2(c COLLATE nocase);

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CREATE INDEX t2c3 ON t2(c COLLATE rtrim);

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INSERT INTO t2 VALUES(1, 'abc', 'abc', 'abc');

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INSERT INTO t2 VALUES(2, 'abC', 'abC', 'abC');

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INSERT INTO t2 VALUES(3, 'abc ', 'abc ', 'abc ');

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INSERT INTO t2 VALUES(4, 'abC ', 'abC ', 'abC ');

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INSERT INTO t2 VALUES(5, 'aBc', 'aBc', 'aBc');

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INSERT INTO t2 VALUES(6, 'aBC', 'aBC', 'aBC');

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INSERT INTO t2 VALUES(7, 'aBc ', 'aBc ', 'aBc ');

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INSERT INTO t2 VALUES(8, 'aBC ', 'aBC ', 'aBC ');

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ANALYZE;

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SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t2' ORDER BY idx;

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}

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} {t2a {8 4} t2b {8 2} t2c {8 1} t2c2 {8 4} t2c3 {8 2}}

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finish_test

wasCSharpSQLite – Blame information for rev 1