AryaWu/sqlite

1# 2011 January 042#3# The author disclaims copyright to this source code.  In place of4# 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 containing14# 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.tcl22 23# If SQLITE_OMIT_ALTERTABLE is defined, omit this file.24ifcapable !altertable {25  finish_test26  return27}28 29do_test analyze4-1.0 {30  db eval {31    CREATE TABLE t1(a,b);32    CREATE INDEX t1a ON t1(a);33    CREATE INDEX t1b ON t1(b);34    INSERT INTO t1 VALUES(1,NULL);35    INSERT INTO t1 SELECT a+1, b FROM t1;36    INSERT INTO t1 SELECT a+2, b FROM t1;37    INSERT INTO t1 SELECT a+4, b FROM t1;38    INSERT INTO t1 SELECT a+8, b FROM t1;39    INSERT INTO t1 SELECT a+16, b FROM t1;40    INSERT INTO t1 SELECT a+32, b FROM t1;41    INSERT INTO t1 SELECT a+64, b FROM t1;42    ANALYZE;43  }44 45  # Should choose the t1a index since it is more specific than t1b.46  db eval {EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=5 AND b IS NULL}47} {/*SEARCH t1 USING INDEX t1a (a=?)*/}48 49# Verify that the t1b index shows that it does not narrow down the50# search any at all.51#52do_test analyze4-1.1 {53  db eval {54    SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx;55  }56} {t1a {128 1} t1b {128 128}}57 58# Change half of the b values from NULL to a constant.  Verify59# that the number of rows selected in stat1 is half the total 60# number of rows.61#62do_test analyze4-1.2 {63  db eval {64    UPDATE t1 SET b='x' WHERE a%2;65    ANALYZE;66    SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx;67  }68} {t1a {128 1} t1b {128 64}}69 70# Change the t1.b values all back to NULL.  Add columns t1.c and t1.d.71# Create a multi-column indices using t1.b and verify that ANALYZE 72# processes them correctly.73#74do_test analyze4-1.3 {75  db eval {76    UPDATE t1 SET b=NULL;77    ALTER TABLE t1 ADD COLUMN c;78    ALTER TABLE t1 ADD COLUMN d;79    UPDATE t1 SET c=a/4, d=a/2;80    CREATE INDEX t1bcd ON t1(b,c,d);81    CREATE INDEX t1cdb ON t1(c,d,b);82    CREATE INDEX t1cbd ON t1(c,b,d);83    ANALYZE;84    SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t1' ORDER BY idx;85  }86} {t1a {128 1} t1b {128 128} t1bcd {128 128 4 2} t1cbd {128 4 4 2} t1cdb {128 4 2 2}}87 88# Verify that collating sequences are taken into account when computing89# ANALYZE statistics.90#91do_test analyze4-2.0 {92  db eval {93    CREATE TABLE t2(94      x INTEGER PRIMARY KEY,95      a TEXT COLLATE nocase,96      b TEXT COLLATE rtrim,97      c TEXT COLLATE binary98    );99    CREATE INDEX t2a ON t2(a);100    CREATE INDEX t2b ON t2(b);101    CREATE INDEX t2c ON t2(c);102    CREATE INDEX t2c2 ON t2(c COLLATE nocase);103    CREATE INDEX t2c3 ON t2(c COLLATE rtrim);104    INSERT INTO t2 VALUES(1, 'abc', 'abc', 'abc');105    INSERT INTO t2 VALUES(2, 'abC', 'abC', 'abC');106    INSERT INTO t2 VALUES(3, 'abc ', 'abc ', 'abc ');107    INSERT INTO t2 VALUES(4, 'abC ', 'abC ', 'abC ');108    INSERT INTO t2 VALUES(5, 'aBc', 'aBc', 'aBc');109    INSERT INTO t2 VALUES(6, 'aBC', 'aBC', 'aBC');110    INSERT INTO t2 VALUES(7, 'aBc ', 'aBc ', 'aBc ');111    INSERT INTO t2 VALUES(8, 'aBC ', 'aBC ', 'aBC ');112    ANALYZE;113    SELECT idx, stat FROM sqlite_stat1 WHERE tbl='t2' ORDER BY idx;114  }115} {t2a {8 4} t2b {8 2} t2c {8 1} t2c2 {8 4} t2c3 {8 2}}116 117finish_test118