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1 office 1 # 2007 July 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 # This file implements regression tests for SQLite library. The
12 # focus of this file is testing SELECT statements that contain
13 # aggregate min() and max() functions and which are handled as
14 # as a special case. This file makes sure that the min/max
15 # optimization works right in the presence of descending
16 # indices. Ticket #2514.
17 #
18 # $Id: minmax2.test,v 1.2 2008/01/05 17:39:30 danielk1977 Exp $
19  
20 set testdir [file dirname $argv0]
21 source $testdir/tester.tcl
22  
23 do_test minmax2-1.0 {
24 execsql {
25 PRAGMA legacy_file_format=0;
26 BEGIN;
27 CREATE TABLE t1(x, y);
28 INSERT INTO t1 VALUES(1,1);
29 INSERT INTO t1 VALUES(2,2);
30 INSERT INTO t1 VALUES(3,2);
31 INSERT INTO t1 VALUES(4,3);
32 INSERT INTO t1 VALUES(5,3);
33 INSERT INTO t1 VALUES(6,3);
34 INSERT INTO t1 VALUES(7,3);
35 INSERT INTO t1 VALUES(8,4);
36 INSERT INTO t1 VALUES(9,4);
37 INSERT INTO t1 VALUES(10,4);
38 INSERT INTO t1 VALUES(11,4);
39 INSERT INTO t1 VALUES(12,4);
40 INSERT INTO t1 VALUES(13,4);
41 INSERT INTO t1 VALUES(14,4);
42 INSERT INTO t1 VALUES(15,4);
43 INSERT INTO t1 VALUES(16,5);
44 INSERT INTO t1 VALUES(17,5);
45 INSERT INTO t1 VALUES(18,5);
46 INSERT INTO t1 VALUES(19,5);
47 INSERT INTO t1 VALUES(20,5);
48 COMMIT;
49 SELECT DISTINCT y FROM t1 ORDER BY y;
50 }
51 } {1 2 3 4 5}
52  
53 do_test minmax2-1.1 {
54 set sqlite_search_count 0
55 execsql {SELECT min(x) FROM t1}
56 } {1}
57 do_test minmax2-1.2 {
58 set sqlite_search_count
59 } {19}
60 do_test minmax2-1.3 {
61 set sqlite_search_count 0
62 execsql {SELECT max(x) FROM t1}
63 } {20}
64 do_test minmax2-1.4 {
65 set sqlite_search_count
66 } {19}
67 do_test minmax2-1.5 {
68 execsql {CREATE INDEX t1i1 ON t1(x DESC)}
69 set sqlite_search_count 0
70 execsql {SELECT min(x) FROM t1}
71 } {1}
72 do_test minmax2-1.6 {
73 set sqlite_search_count
74 } {1}
75 do_test minmax2-1.7 {
76 set sqlite_search_count 0
77 execsql {SELECT max(x) FROM t1}
78 } {20}
79 do_test minmax2-1.8 {
80 set sqlite_search_count
81 } {0}
82 do_test minmax2-1.9 {
83 set sqlite_search_count 0
84 execsql {SELECT max(y) FROM t1}
85 } {5}
86 do_test minmax2-1.10 {
87 set sqlite_search_count
88 } {19}
89  
90 do_test minmax2-2.0 {
91 execsql {
92 CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
93 INSERT INTO t2 SELECT * FROM t1;
94 }
95 set sqlite_search_count 0
96 execsql {SELECT min(a) FROM t2}
97 } {1}
98 do_test minmax2-2.1 {
99 set sqlite_search_count
100 } {0}
101 do_test minmax2-2.2 {
102 set sqlite_search_count 0
103 execsql {SELECT max(a) FROM t2}
104 } {20}
105 do_test minmax2-2.3 {
106 set sqlite_search_count
107 } {0}
108  
109 do_test minmax2-3.0 {
110 ifcapable subquery {
111 execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
112 } else {
113 db function max_a_t2 {execsql {SELECT max(a) FROM t2}}
114 execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)}
115 }
116 set sqlite_search_count 0
117 execsql {SELECT max(a) FROM t2}
118 } {21}
119 do_test minmax2-3.1 {
120 set sqlite_search_count
121 } {0}
122 do_test minmax2-3.2 {
123 ifcapable subquery {
124 execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
125 } else {
126 db function max_a_t2 {execsql {SELECT max(a) FROM t2}}
127 execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)}
128 }
129 set sqlite_search_count 0
130 ifcapable subquery {
131 execsql { SELECT b FROM t2 WHERE a=(SELECT max(a) FROM t2) }
132 } else {
133 execsql { SELECT b FROM t2 WHERE a=max_a_t2() }
134 }
135 } {999}
136 do_test minmax2-3.3 {
137 set sqlite_search_count
138 } {0}
139  
140 ifcapable {compound && subquery} {
141 do_test minmax2-4.1 {
142 execsql {
143 SELECT coalesce(min(x+0),-1), coalesce(max(x+0),-1) FROM
144 (SELECT * FROM t1 UNION SELECT NULL as 'x', NULL as 'y')
145 }
146 } {1 20}
147 do_test minmax2-4.2 {
148 execsql {
149 SELECT y, coalesce(sum(x),0) FROM
150 (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1)
151 GROUP BY y ORDER BY y;
152 }
153 } {1 1 2 5 3 22 4 92 5 90 6 0}
154 do_test minmax2-4.3 {
155 execsql {
156 SELECT y, count(x), count(*) FROM
157 (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1)
158 GROUP BY y ORDER BY y;
159 }
160 } {1 1 1 2 2 3 3 4 5 4 8 9 5 5 6 6 0 1}
161 } ;# ifcapable compound
162  
163 # Make sure the min(x) and max(x) optimizations work on empty tables
164 # including empty tables with indices. Ticket #296.
165 #
166 do_test minmax2-5.1 {
167 execsql {
168 CREATE TABLE t3(x INTEGER UNIQUE NOT NULL);
169 SELECT coalesce(min(x),999) FROM t3;
170 }
171 } {999}
172 do_test minmax2-5.2 {
173 execsql {
174 SELECT coalesce(min(rowid),999) FROM t3;
175 }
176 } {999}
177 do_test minmax2-5.3 {
178 execsql {
179 SELECT coalesce(max(x),999) FROM t3;
180 }
181 } {999}
182 do_test minmax2-5.4 {
183 execsql {
184 SELECT coalesce(max(rowid),999) FROM t3;
185 }
186 } {999}
187 do_test minmax2-5.5 {
188 execsql {
189 SELECT coalesce(max(rowid),999) FROM t3 WHERE rowid<25;
190 }
191 } {999}
192  
193 # Make sure the min(x) and max(x) optimizations work when there
194 # is a LIMIT clause. Ticket #396.
195 #
196 do_test minmax2-6.1 {
197 execsql {
198 SELECT min(a) FROM t2 LIMIT 1
199 }
200 } {1}
201 do_test minmax2-6.2 {
202 execsql {
203 SELECT max(a) FROM t2 LIMIT 3
204 }
205 } {22}
206 do_test minmax2-6.3 {
207 execsql {
208 SELECT min(a) FROM t2 LIMIT 0,100
209 }
210 } {1}
211 do_test minmax2-6.4 {
212 execsql {
213 SELECT max(a) FROM t2 LIMIT 1,100
214 }
215 } {}
216 do_test minmax2-6.5 {
217 execsql {
218 SELECT min(x) FROM t3 LIMIT 1
219 }
220 } {{}}
221 do_test minmax2-6.6 {
222 execsql {
223 SELECT max(x) FROM t3 LIMIT 0
224 }
225 } {}
226 do_test minmax2-6.7 {
227 execsql {
228 SELECT max(a) FROM t2 LIMIT 0
229 }
230 } {}
231  
232 # Make sure the max(x) and min(x) optimizations work for nested
233 # queries. Ticket #587.
234 #
235 do_test minmax2-7.1 {
236 execsql {
237 SELECT max(x) FROM t1;
238 }
239 } 20
240 ifcapable subquery {
241 do_test minmax2-7.2 {
242 execsql {
243 SELECT * FROM (SELECT max(x) FROM t1);
244 }
245 } 20
246 }
247 do_test minmax2-7.3 {
248 execsql {
249 SELECT min(x) FROM t1;
250 }
251 } 1
252 ifcapable subquery {
253 do_test minmax2-7.4 {
254 execsql {
255 SELECT * FROM (SELECT min(x) FROM t1);
256 }
257 } 1
258 }
259  
260 # Make sure min(x) and max(x) work correctly when the datatype is
261 # TEXT instead of NUMERIC. Ticket #623.
262 #
263 do_test minmax2-8.1 {
264 execsql {
265 CREATE TABLE t4(a TEXT);
266 INSERT INTO t4 VALUES('1234');
267 INSERT INTO t4 VALUES('234');
268 INSERT INTO t4 VALUES('34');
269 SELECT min(a), max(a) FROM t4;
270 }
271 } {1234 34}
272 do_test minmax2-8.2 {
273 execsql {
274 CREATE TABLE t5(a INTEGER);
275 INSERT INTO t5 VALUES('1234');
276 INSERT INTO t5 VALUES('234');
277 INSERT INTO t5 VALUES('34');
278 SELECT min(a), max(a) FROM t5;
279 }
280 } {34 1234}
281  
282 # Ticket #658: Test the min()/max() optimization when the FROM clause
283 # is a subquery.
284 #
285 ifcapable {compound && subquery} {
286 do_test minmax2-9.1 {
287 execsql {
288 SELECT max(rowid) FROM (
289 SELECT max(rowid) FROM t4 UNION SELECT max(rowid) FROM t5
290 )
291 }
292 } {1}
293 do_test minmax2-9.2 {
294 execsql {
295 SELECT max(rowid) FROM (
296 SELECT max(rowid) FROM t4 EXCEPT SELECT max(rowid) FROM t5
297 )
298 }
299 } {{}}
300 } ;# ifcapable compound&&subquery
301  
302 # If there is a NULL in an aggregate max() or min(), ignore it. An
303 # aggregate min() or max() will only return NULL if all values are NULL.
304 #
305 do_test minmax2-10.1 {
306 execsql {
307 CREATE TABLE t6(x);
308 INSERT INTO t6 VALUES(1);
309 INSERT INTO t6 VALUES(2);
310 INSERT INTO t6 VALUES(NULL);
311 SELECT coalesce(min(x),-1) FROM t6;
312 }
313 } {1}
314 do_test minmax2-10.2 {
315 execsql {
316 SELECT max(x) FROM t6;
317 }
318 } {2}
319 do_test minmax2-10.3 {
320 execsql {
321 CREATE INDEX i6 ON t6(x DESC);
322 SELECT coalesce(min(x),-1) FROM t6;
323 }
324 } {1}
325 do_test minmax2-10.4 {
326 execsql {
327 SELECT max(x) FROM t6;
328 }
329 } {2}
330 do_test minmax2-10.5 {
331 execsql {
332 DELETE FROM t6 WHERE x NOT NULL;
333 SELECT count(*) FROM t6;
334 }
335 } 1
336 do_test minmax2-10.6 {
337 execsql {
338 SELECT count(x) FROM t6;
339 }
340 } 0
341 ifcapable subquery {
342 do_test minmax2-10.7 {
343 execsql {
344 SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
345 }
346 } {{} {}}
347 }
348 do_test minmax2-10.8 {
349 execsql {
350 SELECT min(x), max(x) FROM t6;
351 }
352 } {{} {}}
353 do_test minmax2-10.9 {
354 execsql {
355 INSERT INTO t6 SELECT * FROM t6;
356 INSERT INTO t6 SELECT * FROM t6;
357 INSERT INTO t6 SELECT * FROM t6;
358 INSERT INTO t6 SELECT * FROM t6;
359 INSERT INTO t6 SELECT * FROM t6;
360 INSERT INTO t6 SELECT * FROM t6;
361 INSERT INTO t6 SELECT * FROM t6;
362 INSERT INTO t6 SELECT * FROM t6;
363 INSERT INTO t6 SELECT * FROM t6;
364 INSERT INTO t6 SELECT * FROM t6;
365 SELECT count(*) FROM t6;
366 }
367 } 1024
368 do_test minmax2-10.10 {
369 execsql {
370 SELECT count(x) FROM t6;
371 }
372 } 0
373 ifcapable subquery {
374 do_test minmax2-10.11 {
375 execsql {
376 SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
377 }
378 } {{} {}}
379 }
380 do_test minmax2-10.12 {
381 execsql {
382 SELECT min(x), max(x) FROM t6;
383 }
384 } {{} {}}
385  
386  
387 finish_test