third_party/sqlite/sqlite-src-3100200/test/autoindex3.test - Issue 2846743003: [sql] Remove SQLite 3.10.2 reference directory.

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Issue 2846743003: [sql] Remove SQLite 3.10.2 reference directory. (Closed)

Patch Set: Created 3 years, 7 months ago

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1 # 2014-06-17

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. The

13 # focus of this script is testing automatic index creation logic,

14 # and specifically that an automatic index will not be created that

15 # shadows a declared index.

16 #

17

18 set testdir [file dirname $argv0]

19 source $testdir/tester.tcl

20 set testprefix autoindex3

21

22 # The t1b and t2d indexes are not very selective. It used to be that

23 # the autoindex mechanism would create automatic indexes on t1(b) or

24 # t2(d), make assumptions that they were reasonably selective, and use

25 # them instead of t1b or t2d. But that would be cheating, because the

26 # automatic index cannot be any more selective than the real index.

27 #

28 # This test verifies that the cheat is no longer allowed.

29 #

30 do_execsql_test autoindex3-100 {

31 CREATE TABLE t1(a,b,x);

32 CREATE TABLE t2(c,d,y);

33 CREATE INDEX t1b ON t1(b);

34 CREATE INDEX t2d ON t2(d);

35 ANALYZE sqlite_master;

36 INSERT INTO sqlite_stat1 VALUES('t1','t1b','10000 500');

37 INSERT INTO sqlite_stat1 VALUES('t2','t2d','10000 500');

38 ANALYZE sqlite_master;

39 EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d=b;

40 } {~/AUTO/}

41

42 # Automatic indexes can still be used if existing indexes do not

43 # participate in == constraints.

44 #

45 do_execsql_test autoindex3-110 {

46 EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d>b AND x=y;

47 } {/AUTO/}

48 do_execsql_test autoindex3-120 {

49 EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d<b AND x=y;

50 } {/AUTO/}

51 do_execsql_test autoindex3-130 {

52 EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d IS NULL AND x=y;

53 } {/AUTO/}

54 do_execsql_test autoindex3-140 {

55 EXPLAIN QUERY PLAN SELECT * FROM t1, t2 WHERE d IN (5,b) AND x=y;

56 } {/AUTO/}

57

58 reset_db

59 do_execsql_test 210 {

60 CREATE TABLE v(b, d, e);

61 CREATE TABLE u(a, b, c);

62 ANALYZE sqlite_master;

63 INSERT INTO "sqlite_stat1" VALUES('u','uab','40000 400 1');

64 INSERT INTO "sqlite_stat1" VALUES('v','vbde','40000 400 1 1');

65 INSERT INTO "sqlite_stat1" VALUES('v','ve','40000 21');

66

67 CREATE INDEX uab on u(a, b);

68 CREATE INDEX ve on v(e);

69 CREATE INDEX vbde on v(b,d,e);

70

71 DROP TABLE IF EXISTS sqlite_stat4;

72 ANALYZE sqlite_master;

73 }

74

75 # At one point, SQLite was using the inferior plan:

76 #

77 # 0\|0\|1\|SEARCH TABLE v USING INDEX ve (e>?)

78 # 0\|1\|0\|SEARCH TABLE u USING COVERING INDEX uab (ANY(a) AND b=?)

79 #

80 # on the basis that the real index "uab" must be better than the automatic

81 # index. This is not right - a skip-scan is not necessarily better than an

82 # automatic index scan.

83 #

84 do_eqp_test 220 {

85 select count(*) from u, v where u.b = v.b and v.e > 34;

86 } {

87 0 0 1 {SEARCH TABLE v USING INDEX ve (e>?)}

88 0 1 0 {SEARCH TABLE u USING AUTOMATIC COVERING INDEX (b=?)}

89 }

90

91

92 finish_test

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