| # 2011 January 04 |
| # |
| # 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 ANALYZE to verify that multiple rows containing |
| # a NULL value count as distinct rows for the purposes of analyze |
| # statistics. |
| # |
| # Also include test cases for collating sequences on indices. |
| # |
| |
| set testdir [file dirname $argv0] |
| source $testdir/tester.tcl |
| |
| do_test analyze4-1.0 { |
| db eval { |
| CREATE TABLE t1(a,b); |
| CREATE INDEX t1a ON t1(a); |
| CREATE INDEX t1b ON t1(b); |
| INSERT INTO t1 VALUES(1,NULL); |
| INSERT INTO t1 SELECT a+1, b FROM t1; |
| INSERT INTO t1 SELECT a+2, b FROM t1; |
| INSERT INTO t1 SELECT a+4, b FROM t1; |
| INSERT INTO t1 SELECT a+8, b FROM t1; |
| INSERT INTO t1 SELECT a+16, b FROM t1; |
| INSERT INTO t1 SELECT a+32, b FROM t1; |
| INSERT INTO t1 SELECT a+64, b FROM t1; |
| ANALYZE; |
| } |
| |
| # Should choose the t1a index since it is more specific than t1b. |
| db eval {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=5 AND b IS NULL} |
| } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}} |
| |
| # Verify that the t1b index shows that it does not narrow down the |
| # search any at all. |
| # |
| do_test analyze4-1.1 { |
| db eval { |
| SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx; |
| } |
| } {t1a {128 1} t1b {128 128}} |
| |
| # Change half of the b values from NULL to a constant. Verify |
| # that the number of rows selected in stat1 is half the total |
| # number of rows. |
| # |
| do_test analyze4-1.2 { |
| db eval { |
| UPDATE t1 SET b='x' WHERE a%2; |
| ANALYZE; |
| SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx; |
| } |
| } {t1a {128 1} t1b {128 64}} |
| |
| # Change the t1.b values all back to NULL. Add columns t1.c and t1.d. |
| # Create a multi-column indices using t1.b and verify that ANALYZE |
| # processes them correctly. |
| # |
| do_test analyze4-1.3 { |
| db eval { |
| UPDATE t1 SET b=NULL; |
| ALTER TABLE t1 ADD COLUMN c; |
| ALTER TABLE t1 ADD COLUMN d; |
| UPDATE t1 SET c=a/4, d=a/2; |
| CREATE INDEX t1bcd ON t1(b,c,d); |
| CREATE INDEX t1cdb ON t1(c,d,b); |
| CREATE INDEX t1cbd ON t1(c,b,d); |
| ANALYZE; |
| SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx; |
| } |
| } {t1a {128 1} t1b {128 128} t1bcd {128 128 4 2} t1cbd {128 4 4 2} t1cdb {128 4 2 2}} |
| |
| # Verify that collating sequences are taken into account when computing |
| # ANALYZE statistics. |
| # |
| do_test analyze4-2.0 { |
| db eval { |
| CREATE TABLE t2( |
| x INTEGER PRIMARY KEY, |
| a TEXT COLLATE nocase, |
| b TEXT COLLATE rtrim, |
| c TEXT COLLATE binary |
| ); |
| CREATE INDEX t2a ON t2(a); |
| CREATE INDEX t2b ON t2(b); |
| CREATE INDEX t2c ON t2(c); |
| CREATE INDEX t2c2 ON t2(c COLLATE nocase); |
| CREATE INDEX t2c3 ON t2(c COLLATE rtrim); |
| INSERT INTO t2 VALUES(1, 'abc', 'abc', 'abc'); |
| INSERT INTO t2 VALUES(2, 'abC', 'abC', 'abC'); |
| INSERT INTO t2 VALUES(3, 'abc ', 'abc ', 'abc '); |
| INSERT INTO t2 VALUES(4, 'abC ', 'abC ', 'abC '); |
| INSERT INTO t2 VALUES(5, 'aBc', 'aBc', 'aBc'); |
| INSERT INTO t2 VALUES(6, 'aBC', 'aBC', 'aBC'); |
| INSERT INTO t2 VALUES(7, 'aBc ', 'aBc ', 'aBc '); |
| INSERT INTO t2 VALUES(8, 'aBC ', 'aBC ', 'aBC '); |
| ANALYZE; |
| SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t2' ORDER BY idx; |
| } |
| } {t2a {8 4} t2b {8 2} t2c {8 1} t2c2 {8 4} t2c3 {8 2}} |
| |
| finish_test |