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