1# 2011 January 04 2# 3# The author disclaims copyright to this source code. In place of 4# a legal notice, here is a blessing: 5# 6# May you do good and not evil. 7# May you find forgiveness for yourself and forgive others. 8# May you share freely, never taking more than you give. 9# 10#*********************************************************************** 11# 12# This file implements regression tests for SQLite library. This file 13# implements tests for ANALYZE to verify that multiple rows containing 14# a NULL value count as distinct rows for the purposes of analyze 15# statistics. 16# 17# Also include test cases for collating sequences on indices. 18# 19 20set testdir [file dirname $argv0] 21source $testdir/tester.tcl 22 23do_test analyze4-1.0 { 24 db eval { 25 CREATE TABLE t1(a,b); 26 CREATE INDEX t1a ON t1(a); 27 CREATE INDEX t1b ON t1(b); 28 INSERT INTO t1 VALUES(1,NULL); 29 INSERT INTO t1 SELECT a+1, b FROM t1; 30 INSERT INTO t1 SELECT a+2, b FROM t1; 31 INSERT INTO t1 SELECT a+4, b FROM t1; 32 INSERT INTO t1 SELECT a+8, b FROM t1; 33 INSERT INTO t1 SELECT a+16, b FROM t1; 34 INSERT INTO t1 SELECT a+32, b FROM t1; 35 INSERT INTO t1 SELECT a+64, b FROM t1; 36 ANALYZE; 37 } 38 39 # Should choose the t1a index since it is more specific than t1b. 40 db eval {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=5 AND b IS NULL} 41} {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}} 42 43# Verify that the t1b index shows that it does not narrow down the 44# search any at all. 45# 46do_test analyze4-1.1 { 47 db eval { 48 SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx; 49 } 50} {t1a {128 1} t1b {128 128}} 51 52# Change half of the b values from NULL to a constant. Verify 53# that the number of rows selected in stat1 is half the total 54# number of rows. 55# 56do_test analyze4-1.2 { 57 db eval { 58 UPDATE t1 SET b='x' WHERE a%2; 59 ANALYZE; 60 SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx; 61 } 62} {t1a {128 1} t1b {128 64}} 63 64# Change the t1.b values all back to NULL. Add columns t1.c and t1.d. 65# Create a multi-column indices using t1.b and verify that ANALYZE 66# processes them correctly. 67# 68do_test analyze4-1.3 { 69 db eval { 70 UPDATE t1 SET b=NULL; 71 ALTER TABLE t1 ADD COLUMN c; 72 ALTER TABLE t1 ADD COLUMN d; 73 UPDATE t1 SET c=a/4, d=a/2; 74 CREATE INDEX t1bcd ON t1(b,c,d); 75 CREATE INDEX t1cdb ON t1(c,d,b); 76 CREATE INDEX t1cbd ON t1(c,b,d); 77 ANALYZE; 78 SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx; 79 } 80} {t1a {128 1} t1b {128 128} t1bcd {128 128 4 2} t1cbd {128 4 4 2} t1cdb {128 4 2 2}} 81 82# Verify that collating sequences are taken into account when computing 83# ANALYZE statistics. 84# 85do_test analyze4-2.0 { 86 db eval { 87 CREATE TABLE t2( 88 x INTEGER PRIMARY KEY, 89 a TEXT COLLATE nocase, 90 b TEXT COLLATE rtrim, 91 c TEXT COLLATE binary 92 ); 93 CREATE INDEX t2a ON t2(a); 94 CREATE INDEX t2b ON t2(b); 95 CREATE INDEX t2c ON t2(c); 96 CREATE INDEX t2c2 ON t2(c COLLATE nocase); 97 CREATE INDEX t2c3 ON t2(c COLLATE rtrim); 98 INSERT INTO t2 VALUES(1, 'abc', 'abc', 'abc'); 99 INSERT INTO t2 VALUES(2, 'abC', 'abC', 'abC'); 100 INSERT INTO t2 VALUES(3, 'abc ', 'abc ', 'abc '); 101 INSERT INTO t2 VALUES(4, 'abC ', 'abC ', 'abC '); 102 INSERT INTO t2 VALUES(5, 'aBc', 'aBc', 'aBc'); 103 INSERT INTO t2 VALUES(6, 'aBC', 'aBC', 'aBC'); 104 INSERT INTO t2 VALUES(7, 'aBc ', 'aBc ', 'aBc '); 105 INSERT INTO t2 VALUES(8, 'aBC ', 'aBC ', 'aBC '); 106 ANALYZE; 107 SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t2' ORDER BY idx; 108 } 109} {t2a {8 4} t2b {8 2} t2c {8 1} t2c2 {8 4} t2c3 {8 2}} 110 111finish_test 112