niceSOFT/sqlite: Official Git mirror of the SQLite source tree

test/offset1.test
202 строки5 KB
drh
Fix a problem with the query optimizer for LIMIT/OFFSET queries when
04 авг 2022, 20:15
04 авг 2022, 20:15bffd5c1
# 2015-10-06
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# 
# This file implements test cases for the [b65cb2c8d91f6685841d7d1e13b6]
# bug:  Correct handling of LIMIT and OFFSET on a UNION ALL query where
# the right-hand SELECT contains an ORDER BY in a subquery.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

ifcapable !compound {
  finish_test
  return
}

do_execsql_test offset1-1.1 {
  CREATE TABLE t1(a,b);
  INSERT INTO t1 VALUES(1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e');
  CREATE TABLE t2(x,y);
  INSERT INTO t2 VALUES(8,'y'),(9,'z'),(6,'w'),(7,'x');
  SELECT count(*) FROM t1, t2;
} {20}

do_execsql_test offset1-1.2.0 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 0;
} {1 a 2 b 3 c}
do_execsql_test offset1-1.2.1 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 1;
} {2 b 3 c 4 d}
do_execsql_test offset1-1.2.2 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 2;
} {3 c 4 d 5 e}
do_execsql_test offset1-1.2.3 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 3;
} {4 d 5 e 6 w}
do_execsql_test offset1-1.2.4 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 4;
} {5 e 6 w 7 x}
do_execsql_test offset1-1.2.5 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 5;
} {6 w 7 x 8 y}
do_execsql_test offset1-1.2.6 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 6;
} {7 x 8 y 9 z}
do_execsql_test offset1-1.2.7 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 7;
} {8 y 9 z}
do_execsql_test offset1-1.2.8 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 8;
} {9 z}
do_execsql_test offset1-1.2.9 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 9;
} {}

do_execsql_test offset1-1.3.0 {
  SELECT * FROM t1 LIMIT 0;
} {}

do_execsql_test offset1-1.4.0 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 0 OFFSET 1;
} {}
do_execsql_test offset1-1.4.1 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 1 OFFSET 1;
} {2 b}
do_execsql_test offset1-1.4.2 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 2 OFFSET 1;
} {2 b 3 c}
do_execsql_test offset1-1.4.3 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 3 OFFSET 1;
} {2 b 3 c 4 d}
do_execsql_test offset1-1.4.4 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 4 OFFSET 1;
} {2 b 3 c 4 d 5 e}
do_execsql_test offset1-1.4.5 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 5 OFFSET 1;
} {2 b 3 c 4 d 5 e 6 w}
do_execsql_test offset1-1.4.6 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 6 OFFSET 1;
} {2 b 3 c 4 d 5 e 6 w 7 x}
do_execsql_test offset1-1.4.7 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 7 OFFSET 1;
} {2 b 3 c 4 d 5 e 6 w 7 x 8 y}
do_execsql_test offset1-1.4.8 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 8 OFFSET 1;
} {2 b 3 c 4 d 5 e 6 w 7 x 8 y 9 z}
do_execsql_test offset1-1.4.9 {
  SELECT a, b FROM t1
  UNION ALL
  SELECT * FROM (SELECT x, y FROM t2 ORDER BY y)
  LIMIT 9 OFFSET 1;
} {2 b 3 c 4 d 5 e 6 w 7 x 8 y 9 z}

# 2022-08-04
# https://sqlite.org/forum/forumpost/6b5e9188f0657616
#
do_execsql_test offset1-2.0 {
  CREATE TABLE employees (
    id integer primary key,
    name text,
    city text,
    department text,
    salary integer
  );
  INSERT INTO employees VALUES
    (11,'Diane','London','hr',70),
    (12,'Bob','London','hr',78),
    (21,'Emma','London','it',84),
    (22,'Grace','Berlin','it',90),
    (23,'Henry','London','it',104),
    (24,'Irene','Berlin','it',104),
    (25,'Frank','Berlin','it',120),
    (31,'Cindy','Berlin','sales',96),
    (32,'Dave','London','sales',96),
    (33,'Alice','Berlin','sales',100);
  CREATE VIEW v AS
    SELECT * FROM (
      SELECT * FROM employees 
       WHERE salary < 100
       ORDER BY salary desc)
     UNION ALL 
     SELECT * FROM (
       SELECT * FROM employees
       WHERE salary >= 100
       ORDER BY salary asc);
} {}
do_execsql_test offset1-2.1 {
  SELECT * FROM v LIMIT 5 OFFSET 2;
} {
  22  Grace  Berlin  it      90
  21  Emma   London  it      84
  12  Bob    London  hr      78
  11  Diane  London  hr      70
  33  Alice  Berlin  sales   100
}

finish_test