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test/distinct2.test
415 строк12 KB
dan
Fix a long-standing problem with DISTINCT LEFT JOIN queries.
05 мар 2026, 17:39
05 мар 2026, 17:3946686ac
# 2016-04-15
#
# 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 regression tests for SQLite library.  The
# focus of this script is DISTINCT queries using the skip-ahead 
# optimization.
#

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

set testprefix distinct2

do_execsql_test 100 {
  CREATE TABLE t1(x INTEGER PRIMARY KEY);
  INSERT INTO t1 VALUES(0),(1),(2);
  CREATE TABLE t2 AS
     SELECT DISTINCT a.x AS aa, b.x AS bb
      FROM t1 a, t1 b;
  SELECT *, '|' FROM t2 ORDER BY aa, bb;
} {0 0 | 0 1 | 0 2 | 1 0 | 1 1 | 1 2 | 2 0 | 2 1 | 2 2 |}
do_execsql_test 110 {
  DROP TABLE t2;
  CREATE TABLE t2 AS
     SELECT DISTINCT a.x AS aa, b.x AS bb
       FROM t1 a, t1 b
      WHERE a.x IN t1 AND b.x IN t1;
  SELECT *, '|' FROM t2 ORDER BY aa, bb;
} {0 0 | 0 1 | 0 2 | 1 0 | 1 1 | 1 2 | 2 0 | 2 1 | 2 2 |}
do_execsql_test 120 {
  CREATE TABLE t102 (i0 TEXT UNIQUE NOT NULL);
  INSERT INTO t102 VALUES ('0'),('1'),('2');
  DROP TABLE t2;
  CREATE TABLE t2 AS
    SELECT DISTINCT * 
    FROM t102 AS t0 
    JOIN t102 AS t4 ON (t2.i0 IN t102)
    NATURAL JOIN t102 AS t3
    JOIN t102 AS t1 ON (t0.i0 IN t102)
    JOIN t102 AS t2 ON (t2.i0=+t0.i0 OR (t0.i0<>500 AND t2.i0=t1.i0));
  SELECT *, '|' FROM t2 ORDER BY 1, 2, 3, 4, 5;
} {0 0 0 0 | 0 0 1 0 | 0 0 1 1 | 0 0 2 0 | 0 0 2 2 | 0 1 0 0 | 0 1 1 0 | 0 1 1 1 | 0 1 2 0 | 0 1 2 2 | 0 2 0 0 | 0 2 1 0 | 0 2 1 1 | 0 2 2 0 | 0 2 2 2 | 1 0 0 0 | 1 0 0 1 | 1 0 1 1 | 1 0 2 1 | 1 0 2 2 | 1 1 0 0 | 1 1 0 1 | 1 1 1 1 | 1 1 2 1 | 1 1 2 2 | 1 2 0 0 | 1 2 0 1 | 1 2 1 1 | 1 2 2 1 | 1 2 2 2 | 2 0 0 0 | 2 0 0 2 | 2 0 1 1 | 2 0 1 2 | 2 0 2 2 | 2 1 0 0 | 2 1 0 2 | 2 1 1 1 | 2 1 1 2 | 2 1 2 2 | 2 2 0 0 | 2 2 0 2 | 2 2 1 1 | 2 2 1 2 | 2 2 2 2 |}

do_execsql_test 400 {
  CREATE TABLE t4(a,b,c,d,e,f,g,h,i,j);
  INSERT INTO t4 VALUES(0,1,2,3,4,5,6,7,8,9);
  INSERT INTO t4 SELECT * FROM t4;
  INSERT INTO t4 SELECT * FROM t4;
  CREATE INDEX t4x ON t4(c,d,e);
  SELECT DISTINCT a,b,c FROM t4 WHERE a=0 AND b=1;
} {0 1 2}
do_execsql_test 410 {
  SELECT DISTINCT a,b,c,d FROM t4 WHERE a=0 AND b=1;
} {0 1 2 3}
do_execsql_test 411 {
  SELECT DISTINCT d,a,b,c FROM t4 WHERE a=0 AND b=1;
} {3 0 1 2}
do_execsql_test 420 {
  SELECT DISTINCT a,b,c,d,e FROM t4 WHERE a=0 AND b=1;
} {0 1 2 3 4}
do_execsql_test 430 {
  SELECT DISTINCT a,b,c,d,e,f FROM t4 WHERE a=0 AND b=1;
} {0 1 2 3 4 5}

do_execsql_test 500 {
  CREATE TABLE t5(a INT, b INT);
  CREATE UNIQUE INDEX t5x ON t5(a+b);
  INSERT INTO t5(a,b) VALUES(0,0),(1,0),(1,1),(0,3);
  CREATE TEMP TABLE out AS SELECT DISTINCT a+b FROM t5;
  SELECT * FROM out ORDER BY 1;
} {0 1 2 3}

do_execsql_test 600 {
  CREATE TABLE t6a(x INTEGER PRIMARY KEY);
  INSERT INTO t6a VALUES(1);
  CREATE TABLE t6b(y INTEGER PRIMARY KEY);
  INSERT INTO t6b VALUES(2),(3);
  SELECT DISTINCT x, x FROM t6a, t6b;
} {1 1}

do_execsql_test 700 {
  CREATE TABLE t7(a, b, c);
  WITH s(i) AS (
    SELECT 1 UNION ALL SELECT i+1 FROM s WHERE (i+1)<200
  )
  INSERT INTO t7 SELECT i/100, i/50, i FROM s;
}
do_execsql_test 710 {
  SELECT DISTINCT a, b FROM t7;
} {
  0 0    0 1
  1 2    1 3
}
do_execsql_test 720 {
  SELECT DISTINCT a, b+1 FROM t7;
} {
  0 1    0 2
  1 3    1 4
}
do_execsql_test 730 {
  CREATE INDEX i7 ON t7(a, b+1);
  ANALYZE;
  SELECT DISTINCT a, b+1 FROM t7;
} {
  0 1    0 2
  1 3    1 4
}

do_execsql_test 800 {
  CREATE TABLE t8(a, b, c);
  WITH s(i) AS (
    SELECT 1 UNION ALL SELECT i+1 FROM s WHERE (i+1)<100
  )
  INSERT INTO t8 SELECT i/40, i/20, i/40 FROM s;
}

do_execsql_test 820 {
  SELECT DISTINCT a, b, c FROM t8;
} {
  0 0 0    0 1 0
  1 2 1    1 3 1
  2 4 2
}

do_execsql_test 820 {
  SELECT DISTINCT a, b, c FROM t8 WHERE b=3;
} {1 3 1}

do_execsql_test 830 {
  CREATE INDEX i8 ON t8(a, c);
  ANALYZE;
  SELECT DISTINCT a, b, c FROM t8 WHERE b=3;
} {1 3 1}

do_execsql_test 900 {
  CREATE TABLE t9(v);
  INSERT INTO t9 VALUES 
    ('abcd'), ('Abcd'), ('aBcd'), ('ABcd'), ('abCd'), ('AbCd'), ('aBCd'), 
    ('ABCd'), ('abcD'), ('AbcD'), ('aBcD'), ('ABcD'), ('abCD'), ('AbCD'), 
    ('aBCD'), ('ABCD'),
    ('wxyz'), ('Wxyz'), ('wXyz'), ('WXyz'), ('wxYz'), ('WxYz'), ('wXYz'), 
    ('WXYz'), ('wxyZ'), ('WxyZ'), ('wXyZ'), ('WXyZ'), ('wxYZ'), ('WxYZ'), 
    ('wXYZ'), ('WXYZ');
}

do_execsql_test 910 {
  SELECT DISTINCT v COLLATE NOCASE, v FROM t9 ORDER BY +v;
} {
  ABCD ABCD ABCd ABCd ABcD ABcD ABcd ABcd AbCD
  AbCD AbCd AbCd AbcD AbcD Abcd Abcd
  WXYZ WXYZ WXYz WXYz WXyZ WXyZ WXyz WXyz WxYZ
  WxYZ WxYz WxYz WxyZ WxyZ Wxyz Wxyz
  aBCD aBCD aBCd aBCd aBcD aBcD aBcd aBcd abCD
  abCD abCd abCd abcD abcD abcd abcd
  wXYZ wXYZ wXYz wXYz wXyZ wXyZ wXyz wXyz wxYZ
  wxYZ wxYz wxYz wxyZ wxyZ wxyz wxyz
}

do_execsql_test 920 {
  CREATE INDEX i9 ON t9(v COLLATE NOCASE, v);
  ANALYZE;

  SELECT DISTINCT v COLLATE NOCASE, v FROM t9 ORDER BY +v;
} {
  ABCD ABCD ABCd ABCd ABcD ABcD ABcd ABcd AbCD
  AbCD AbCd AbCd AbcD AbcD Abcd Abcd
  WXYZ WXYZ WXYz WXYz WXyZ WXyZ WXyz WXyz WxYZ
  WxYZ WxYz WxYz WxyZ WxyZ Wxyz Wxyz
  aBCD aBCD aBCd aBCd aBcD aBcD aBcd aBcd abCD
  abCD abCd abCd abcD abcD abcd abcd
  wXYZ wXYZ wXYz wXYz wXyZ wXyZ wXyz wXyz wxYZ
  wxYZ wxYz wxYz wxyZ wxyZ wxyz wxyz
}

# Ticket https://sqlite.org/src/info/ef9318757b152e3a on 2017-11-21
# Incorrect result due to a skip-ahead-distinct optimization on a
# join where no rows of the inner loop appear in the result set.
#
db close
sqlite3 db :memory:
do_execsql_test 1000 {
  CREATE TABLE t1(a INTEGER PRIMARY KEY, b INTEGER);
  CREATE INDEX t1b ON t1(b);
  CREATE TABLE t2(x INTEGER PRIMARY KEY, y INTEGER);
  CREATE INDEX t2y ON t2(y);
  WITH RECURSIVE c(x) AS (VALUES(0) UNION ALL SELECT x+1 FROM c WHERE x<49)
    INSERT INTO t1(b) SELECT x/10 - 1 FROM c;
  WITH RECURSIVE c(x) AS (VALUES(-1) UNION ALL SELECT x+1 FROM c WHERE x<19)
    INSERT INTO t2(x,y) SELECT x, 1 FROM c;
  SELECT DISTINCT y FROM t1, t2 WHERE b=x AND b<>-1;
  ANALYZE;
  SELECT DISTINCT y FROM t1, t2 WHERE b=x AND b<>-1;
} {1 1}
db close
sqlite3 db :memory:
do_execsql_test 1010 {
  CREATE TABLE t1(a INTEGER PRIMARY KEY, b INTEGER);
  CREATE INDEX t1b ON t1(b);
  CREATE TABLE t2(x INTEGER PRIMARY KEY, y INTEGER);
  CREATE INDEX t2y ON t2(y);
  WITH RECURSIVE c(x) AS (VALUES(0) UNION ALL SELECT x+1 FROM c WHERE x<49)
    INSERT INTO t1(b) SELECT -(x/10 - 1) FROM c;
  WITH RECURSIVE c(x) AS (VALUES(-1) UNION ALL SELECT x+1 FROM c WHERE x<19)
    INSERT INTO t2(x,y) SELECT -x, 1 FROM c;
  SELECT DISTINCT y FROM t1, t2 WHERE b=x AND b<>1 ORDER BY y DESC;
  ANALYZE;
  SELECT DISTINCT y FROM t1, t2 WHERE b=x AND b<>1 ORDER BY y DESC;
} {1 1}
db close
sqlite3 db :memory:
do_execsql_test 1020 {
  CREATE TABLE t1(a, b);
  CREATE INDEX t1a ON t1(a, b);
  -- Lots of rows of (1, 'no'), followed by a single (1, 'yes').
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100)
    INSERT INTO t1(a, b) SELECT 1, 'no' FROM c;
  INSERT INTO t1(a, b) VALUES(1, 'yes');
  CREATE TABLE t2(x PRIMARY KEY);
  INSERT INTO t2 VALUES('yes');
  SELECT DISTINCT a FROM t1, t2 WHERE x=b;
  ANALYZE;
  SELECT DISTINCT a FROM t1, t2 WHERE x=b;
} {1 1}

#-------------------------------------------------------------------------
reset_db

do_execsql_test 2000 {
  CREATE TABLE t0 (c0, c1, c2, PRIMARY KEY (c0, c1));
  CREATE TABLE t1 (c2);
  INSERT INTO t0(c2) VALUES (0),(1),(3),(4),(5),(6),(7),(8),(9),(10),(11);
  INSERT INTO t0(c1) VALUES ('a');
  INSERT INTO t1(c2) VALUES (0);
}
do_execsql_test 2010 {
  SELECT DISTINCT t0.c0, t1._rowid_, t0.c1 FROM t1 CROSS JOIN t0 ORDER BY t0.c0;
} {{} 1 {} {} 1 a}
do_execsql_test 1.2 {
  ANALYZE;
}
do_execsql_test 2020 {
  SELECT DISTINCT t0.c0, t1._rowid_, t0.c1 FROM t1 CROSS JOIN t0 ORDER BY t0.c0;
} {{} 1 {} {} 1 a}


do_execsql_test 2030 {
  CREATE TABLE t2(a, b, c);
  CREATE INDEX t2ab ON t2(a, b);
  
  WITH c(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM c WHERE i<64)
    INSERT INTO t2 SELECT 'one', i%2, 'one' FROM c;

  WITH c(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM c WHERE i<64)
    INSERT INTO t2 SELECT 'two', i%2, 'two' FROM c;

  CREATE TABLE t3(x INTEGER PRIMARY KEY);
  INSERT INTO t3 VALUES(1);

  ANALYZE;
}
do_execsql_test 2040 {
  SELECT DISTINCT a, b, x FROM t3 CROSS JOIN t2 ORDER BY a, +b; 
} {
  one 0 1
  one 1 1
  two 0 1
  two 1 1
}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 3000 {
  CREATE TABLE t0 (c0, c1 NOT NULL DEFAULT 1, c2, PRIMARY KEY (c0, c1));
  INSERT INTO t0(c2) VALUES (NULL), (NULL), (NULL), (NULL), (NULL), (NULL), (NULL), (NULL), (NULL), (NULL), (NULL);
  INSERT INTO t0(c2) VALUES('a');
}

do_execsql_test 3010 {
  SELECT DISTINCT * FROM t0 WHERE NULL IS t0.c0;
} {
  {} 1 {}
  {} 1 a
}

do_execsql_test 3020 {
  ANALYZE;
}

do_execsql_test 3030 {
  SELECT DISTINCT * FROM t0 WHERE NULL IS c0;
} {
  {} 1 {}
  {} 1 a
}

#-------------------------------------------------------------------------
#
reset_db

do_execsql_test 4010 {
  CREATE TABLE t1(a, b COLLATE RTRIM);
  INSERT INTO t1 VALUES(1, ''), (2, ' '), (3, '  ');
}
do_execsql_test 4020 {
  SELECT b FROM t1 UNION SELECT 1;
} {1 {}}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 5010 {
  CREATE TABLE cnt(a);
  WITH RECURSIVE cnt2(x) AS (
    VALUES(1) UNION ALL SELECT x+1 FROM cnt2 WHERE x<50
  )
  INSERT INTO cnt SELECT x FROM cnt2;   
}

do_execsql_test 5020 {
  SELECT DISTINCT abs(random())%5 AS r FROM cnt ORDER BY r; 
} {0 1 2 3 4}

do_execsql_test 5030 {
  SELECT abs(random())%5 AS r FROM cnt GROUP BY 1 ORDER BY 1; 
} {0 1 2 3 4}

do_execsql_test 5040 {
  SELECT a FROM cnt WHERE a>45 GROUP BY 1;
} {46 47 48 49 50}


# 2024-06-03 dbsqlfuzz 8a44f675401a8b1f68a43bf813c4f4f72ad8f0ea
# Use of uninitialized bytecode register due to the call-function-once
# optimization at check-in 663f5dd32d9db832
#
db null NULL
do_execsql_test 5050 {
  CREATE TABLE t0(a TEXT); INSERT INTO t0 VALUES('abcd');
  CREATE TABLE t1(b TEXT);
  CREATE TABLE t2(c TEXT);
  CREATE TABLE t3(d TEXT); INSERT INTO t3 VALUES('wxyz');
  CREATE VIEW  v4(e) AS SELECT (SELECT t2.c FROM t0, t1 GROUP BY 1) FROM t2;
  SELECT v4.e FROM t3 LEFT JOIN v4 ON true GROUP BY 1;
} NULL
do_execsql_test 5060 {
  DROP VIEW v4;
  CREATE VIEW  v4(e) AS SELECT (SELECT t2.c COLLATE nocase FROM t0, t1 GROUP BY 1) FROM t2;
  SELECT v4.e FROM t3 LEFT JOIN v4 ON true GROUP BY 1;
} NULL

do_execsql_test 5070 {
  DROP VIEW v4;
  CREATE VIEW  v4(e) AS SELECT (SELECT unlikely(t2.c COLLATE nocase) FROM t0, t1 GROUP BY 1) FROM t2;
  SELECT v4.e FROM t3 LEFT JOIN v4 ON true GROUP BY 1;
} NULL

# 2024-06-28 dbsqlfuzz 46343912848a603e32c6072cae792eb056bac897
# Do not call sqlite3ExprToRegister() on an expression that is already
# a register.
#
do_execsql_test 5080 {
  CREATE TABLE dual(dummy TEXT);
  INSERT INTO dual VALUES('X');
  SELECT 11 = (
                SELECT b
                  FROM (
                         SELECT a AS b
                           FROM dual
                           LEFT JOIN (SELECT 22 AS a FROM dual)
                       )
                 GROUP BY b, b
              );
} 0

#-------------------------------------------------------------------------
# 2026-03-05 - do not "skip-ahead" of a null-row on the RHS of a 
# LEFT JOIN.
#
reset_db

do_execsql_test 6000 {
  CREATE TABLE t1(c1 UNIQUE NOT NULL);
  INSERT INTO t1 VALUES(1);
  CREATE TABLE t0(c0 UNIQUE);
  INSERT INTO t0 VALUES(0);
  WITH RECURSIVE c(n) AS (VALUES(1) UNION ALL SELECT n+1 FROM c WHERE n<1000)
    INSERT INTO t0(c0) SELECT NULL FROM c;
} {}

do_execsql_test 6010 {
  SELECT DISTINCT * FROM t1 LEFT OUTER JOIN t0 ON c0>c1;
} {1 {}}

do_execsql_test 6020 {
  SELECT DISTINCT * FROM t1 FULL OUTER JOIN t0 ON c0>c1;
} {1 {} {} 0 {} {}}

do_execsql_test 6040 {
  ANALYZE;
  SELECT DISTINCT * FROM t1 LEFT OUTER JOIN t0 ON c0>c1;
} {1 {}}

do_execsql_test 6050 {
  SELECT DISTINCT * FROM t1 FULL OUTER JOIN t0 ON c0>c1;
} {1 {} {} 0 {} {}}

finish_test