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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact 667e75642102c97a00bf9b23d3cb267db321d006:


# 2006 January 31
#
# 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 file is testing the join reordering optimization
# in cases that include a LEFT JOIN.
#
# $Id: where3.test,v 1.4 2008/04/17 19:14:02 drh Exp $

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

# The following is from ticket #1652.
#
# A comma join then a left outer join:  A,B left join C.
# Arrange indices so that the B table is chosen to go first.
# Also put an index on C, but make sure that A is chosen before C.
#
do_test where3-1.1 {
  execsql {
    CREATE TABLE t1(a, b);
    CREATE TABLE t2(p, q);
    CREATE TABLE t3(x, y);
    
    INSERT INTO t1 VALUES(111,'one');
    INSERT INTO t1 VALUES(222,'two');
    INSERT INTO t1 VALUES(333,'three');
    
    INSERT INTO t2 VALUES(1,111);
    INSERT INTO t2 VALUES(2,222);
    INSERT INTO t2 VALUES(4,444);
    CREATE INDEX t2i1 ON t2(p);
    
    INSERT INTO t3 VALUES(999,'nine');
    CREATE INDEX t3i1 ON t3(x);
    
    SELECT * FROM t1, t2 LEFT JOIN t3 ON q=x WHERE p=2 AND a=q;
  }
} {222 two 2 222 {} {}}

ifcapable explain {
  do_test where3-1.1.1 {
     explain_no_trace {SELECT * FROM t1, t2 LEFT JOIN t3 ON q=x
                        WHERE p=2 AND a=q}
  } [explain_no_trace {SELECT * FROM t1, t2 LEFT JOIN t3 ON x=q
                        WHERE p=2 AND a=q}]
}

# Ticket #1830
#
# This is similar to the above but with the LEFT JOIN on the
# other side.
#
do_test where3-1.2 {
  execsql {
    CREATE TABLE parent1(parent1key, child1key, Child2key, child3key);
    CREATE TABLE child1 ( child1key NVARCHAR, value NVARCHAR );
    CREATE UNIQUE INDEX PKIDXChild1 ON child1 ( child1key );
    CREATE TABLE child2 ( child2key NVARCHAR, value NVARCHAR );

    INSERT INTO parent1(parent1key,child1key,child2key)
       VALUES ( 1, 'C1.1', 'C2.1' );
    INSERT INTO child1 ( child1key, value ) VALUES ( 'C1.1', 'Value for C1.1' );
    INSERT INTO child2 ( child2key, value ) VALUES ( 'C2.1', 'Value for C2.1' );

    INSERT INTO parent1 ( parent1key, child1key, child2key )
       VALUES ( 2, 'C1.2', 'C2.2' );
    INSERT INTO child2 ( child2key, value ) VALUES ( 'C2.2', 'Value for C2.2' );

    INSERT INTO parent1 ( parent1key, child1key, child2key )
       VALUES ( 3, 'C1.3', 'C2.3' );
    INSERT INTO child1 ( child1key, value ) VALUES ( 'C1.3', 'Value for C1.3' );
    INSERT INTO child2 ( child2key, value ) VALUES ( 'C2.3', 'Value for C2.3' );

    SELECT parent1.parent1key, child1.value, child2.value
    FROM parent1
    LEFT OUTER JOIN child1 ON child1.child1key = parent1.child1key
    INNER JOIN child2 ON child2.child2key = parent1.child2key;
  }
} {1 {Value for C1.1} {Value for C2.1} 2 {} {Value for C2.2} 3 {Value for C1.3} {Value for C2.3}}

ifcapable explain {
  do_test where3-1.2.1 {
     explain_no_trace {
       SELECT parent1.parent1key, child1.value, child2.value
       FROM parent1
       LEFT OUTER JOIN child1 ON child1.child1key = parent1.child1key
       INNER JOIN child2 ON child2.child2key = parent1.child2key;
     }
  } [explain_no_trace {
       SELECT parent1.parent1key, child1.value, child2.value
       FROM parent1
       LEFT OUTER JOIN child1 ON parent1.child1key = child1.child1key 
       INNER JOIN child2 ON child2.child2key = parent1.child2key;
     }]
}

# This procedure executes the SQL.  Then it appends 
# the ::sqlite_query_plan variable.
#
proc queryplan {sql} {
  set ::sqlite_sort_count 0
  set data [execsql $sql]
  return [concat $data $::sqlite_query_plan]
}


# If you have a from clause of the form:   A B C left join D
# then make sure the query optimizer is able to reorder the 
# A B C part anyway it wants. 
#
# Following the fix to ticket #1652, there was a time when
# the C table would not reorder.  So the following reorderings
# were possible:
#
#            A B C left join D
#            B A C left join D
#
# But these reorders were not allowed
#
#            C A B left join D
#            A C B left join D
#            C B A left join D
#            B C A left join D
#
# The following tests are here to verify that the latter four
# reorderings are allowed again.
#
do_test where3-2.1 {
  execsql {
    CREATE TABLE tA(apk integer primary key, ax);
    CREATE TABLE tB(bpk integer primary key, bx);
    CREATE TABLE tC(cpk integer primary key, cx);
    CREATE TABLE tD(dpk integer primary key, dx);
  }
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE cpk=bx AND bpk=ax
  }
} {tA {} tB * tC * tD *}
do_test where3-2.1.1 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON cx=dpk
     WHERE cpk=bx AND bpk=ax
  }
} {tA {} tB * tC * tD *}
do_test where3-2.1.2 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON cx=dpk
     WHERE bx=cpk AND bpk=ax
  }
} {tA {} tB * tC * tD *}
do_test where3-2.1.3 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON cx=dpk
     WHERE bx=cpk AND ax=bpk
  }
} {tA {} tB * tC * tD *}
do_test where3-2.1.4 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE bx=cpk AND ax=bpk
  }
} {tA {} tB * tC * tD *}
do_test where3-2.1.5 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE cpk=bx AND ax=bpk
  }
} {tA {} tB * tC * tD *}
do_test where3-2.2 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE cpk=bx AND apk=bx
  }
} {tB {} tA * tC * tD *}
do_test where3-2.3 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE cpk=bx AND apk=bx
  }
} {tB {} tA * tC * tD *}
do_test where3-2.4 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE apk=cx AND bpk=ax
  }
} {tC {} tA * tB * tD *}
do_test where3-2.5 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE cpk=ax AND bpk=cx
  }
} {tA {} tC * tB * tD *}
do_test where3-2.6 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE bpk=cx AND apk=bx
  }
} {tC {} tB * tA * tD *}
do_test where3-2.7 {
  queryplan {
    SELECT * FROM tA, tB, tC LEFT JOIN tD ON dpk=cx
     WHERE cpk=bx AND apk=cx
  }
} {tB {} tC * tA * tD *}

# Ticket [13f033c865f878953]
# If the outer loop must be a full table scan, do not let ANALYZE trick
# the planner into use a table for the outer loop that might be indexable
# if held until an inner loop.
# 
do_execsql_test where3-3.0 {
  CREATE TABLE t301(a INTEGER PRIMARY KEY,b,c);
  CREATE INDEX t301c ON t301(c);
  INSERT INTO t301 VALUES(1,2,3);
  CREATE TABLE t302(x, y);
  INSERT INTO t302 VALUES(4,5);
  ANALYZE;
  explain query plan SELECT * FROM t302, t301 WHERE t302.x=5 AND t301.a=t302.y;
} {
  0 0 0 {SCAN TABLE t302 (~1 rows)} 
  0 1 1 {SEARCH TABLE t301 USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)}
}
do_execsql_test where3-3.1 {
  explain query plan
  SELECT * FROM t301, t302 WHERE t302.x=5 AND t301.a=t302.y;
} {
  0 0 1 {SCAN TABLE t302 (~1 rows)} 
  0 1 0 {SEARCH TABLE t301 USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)}
}

# Verify that when there are multiple tables in a join which must be
# full table scans that the query planner attempts put the table with
# the fewest number of output rows as the outer loop.
#
do_execsql_test where3-4.0 {
  CREATE TABLE t400(a INTEGER PRIMARY KEY, b, c);
  CREATE TABLE t401(p INTEGER PRIMARY KEY, q, r);
  CREATE TABLE t402(x INTEGER PRIMARY KEY, y, z);
  EXPLAIN QUERY PLAN
  SELECT * FROM t400, t401, t402 WHERE t402.z GLOB 'abc*';
} {
  0 0 2 {SCAN TABLE t402 (~500000 rows)} 
  0 1 0 {SCAN TABLE t400 (~1000000 rows)} 
  0 2 1 {SCAN TABLE t401 (~1000000 rows)}
}
do_execsql_test where3-4.1 {
  EXPLAIN QUERY PLAN
  SELECT * FROM t400, t401, t402 WHERE t401.r GLOB 'abc*';
} {
  0 0 1 {SCAN TABLE t401 (~500000 rows)} 
  0 1 0 {SCAN TABLE t400 (~1000000 rows)} 
  0 2 2 {SCAN TABLE t402 (~1000000 rows)}
}
do_execsql_test where3-4.2 {
  EXPLAIN QUERY PLAN
  SELECT * FROM t400, t401, t402 WHERE t400.c GLOB 'abc*';
} {
  0 0 0 {SCAN TABLE t400 (~500000 rows)} 
  0 1 1 {SCAN TABLE t401 (~1000000 rows)} 
  0 2 2 {SCAN TABLE t402 (~1000000 rows)}
}

# Verify that a performance regression encountered by firefox
# has been fixed.
#
do_execsql_test where3-5.0 {
  CREATE TABLE aaa (id INTEGER PRIMARY KEY, type INTEGER,
                    fk INTEGER DEFAULT NULL, parent INTEGER,
                    position INTEGER, title LONGVARCHAR,
                    keyword_id INTEGER, folder_type TEXT,
                    dateAdded INTEGER, lastModified INTEGER);
  CREATE INDEX aaa_111 ON aaa (fk, type);
  CREATE INDEX aaa_222 ON aaa (parent, position);
  CREATE INDEX aaa_333 ON aaa (fk, lastModified);
  CREATE TABLE bbb (id INTEGER PRIMARY KEY, type INTEGER,
                    fk INTEGER DEFAULT NULL, parent INTEGER,
                    position INTEGER, title LONGVARCHAR,
                    keyword_id INTEGER, folder_type TEXT,
                    dateAdded INTEGER, lastModified INTEGER);
  CREATE INDEX bbb_111 ON bbb (fk, type);
  CREATE INDEX bbb_222 ON bbb (parent, position);
  CREATE INDEX bbb_333 ON bbb (fk, lastModified);

  EXPLAIN QUERY PLAN
   SELECT bbb.title AS tag_title 
     FROM aaa JOIN bbb ON bbb.id = aaa.parent  
    WHERE aaa.fk = 'constant'
      AND LENGTH(bbb.title) > 0
      AND bbb.parent = 4
    ORDER BY bbb.title COLLATE NOCASE ASC;
} {
  0 0 0 {SEARCH TABLE aaa USING INDEX aaa_333 (fk=?) (~10 rows)} 
  0 1 1 {SEARCH TABLE bbb USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)} 
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
do_execsql_test where3-5.1 {
  EXPLAIN QUERY PLAN
   SELECT bbb.title AS tag_title 
     FROM aaa JOIN aaa AS bbb ON bbb.id = aaa.parent  
    WHERE aaa.fk = 'constant'
      AND LENGTH(bbb.title) > 0
      AND bbb.parent = 4
    ORDER BY bbb.title COLLATE NOCASE ASC;
} {
  0 0 0 {SEARCH TABLE aaa USING INDEX aaa_333 (fk=?) (~10 rows)} 
  0 1 1 {SEARCH TABLE aaa AS bbb USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)} 
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
do_execsql_test where3-5.2 {
  EXPLAIN QUERY PLAN
   SELECT bbb.title AS tag_title 
     FROM bbb JOIN aaa ON bbb.id = aaa.parent  
    WHERE aaa.fk = 'constant'
      AND LENGTH(bbb.title) > 0
      AND bbb.parent = 4
    ORDER BY bbb.title COLLATE NOCASE ASC;
} {
  0 0 1 {SEARCH TABLE aaa USING INDEX aaa_333 (fk=?) (~10 rows)} 
  0 1 0 {SEARCH TABLE bbb USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)} 
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
do_execsql_test where3-5.3 {
  EXPLAIN QUERY PLAN
   SELECT bbb.title AS tag_title 
     FROM aaa AS bbb JOIN aaa ON bbb.id = aaa.parent  
    WHERE aaa.fk = 'constant'
      AND LENGTH(bbb.title) > 0
      AND bbb.parent = 4
    ORDER BY bbb.title COLLATE NOCASE ASC;
} {
  0 0 1 {SEARCH TABLE aaa USING INDEX aaa_333 (fk=?) (~10 rows)} 
  0 1 0 {SEARCH TABLE aaa AS bbb USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)} 
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}

# Name resolution with NATURAL JOIN and USING
#
do_test where3-6.setup {
  db eval {
    CREATE TABLE t6w(a, w);
    INSERT INTO t6w VALUES(1, 'w-one');
    INSERT INTO t6w VALUES(2, 'w-two');
    INSERT INTO t6w VALUES(9, 'w-nine');
    CREATE TABLE t6x(a, x);
    INSERT INTO t6x VALUES(1, 'x-one');
    INSERT INTO t6x VALUES(3, 'x-three');
    INSERT INTO t6x VALUES(9, 'x-nine');
    CREATE TABLE t6y(a, y);
    INSERT INTO t6y VALUES(1, 'y-one');
    INSERT INTO t6y VALUES(4, 'y-four');
    INSERT INTO t6y VALUES(9, 'y-nine');
    CREATE TABLE t6z(a, z);
    INSERT INTO t6z VALUES(1, 'z-one');
    INSERT INTO t6z VALUES(5, 'z-five');
    INSERT INTO t6z VALUES(9, 'z-nine');
  }
} {}
set cnt 0
foreach predicate {
   {}
   {ORDER BY a}
   {ORDER BY t6w.a}
   {WHERE a>0}
   {WHERE t6y.a>0}
   {WHERE a>0 ORDER BY a}
} {
  incr cnt
  do_test where3-6.$cnt.1 {
    set sql "SELECT * FROM t6w NATURAL JOIN t6x NATURAL JOIN t6y"
    append sql " NATURAL JOIN t6z "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
  do_test where3-6.$cnt.2 {
    set sql "SELECT * FROM t6w JOIN t6x USING(a) JOIN t6y USING(a)"
    append sql " JOIN t6z USING(a) "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
  do_test where3-6.$cnt.3 {
    set sql "SELECT * FROM t6w NATURAL JOIN t6x JOIN t6y USING(a)"
    append sql " JOIN t6z USING(a) "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
  do_test where3-6.$cnt.4 {
    set sql "SELECT * FROM t6w JOIN t6x USING(a) NATURAL JOIN t6y"
    append sql " JOIN t6z USING(a) "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
  do_test where3-6.$cnt.5 {
    set sql "SELECT * FROM t6w JOIN t6x USING(a) JOIN t6y USING(a)"
    append sql " NATURAL JOIN t6z "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
  do_test where3-6.$cnt.6 {
    set sql "SELECT * FROM t6w JOIN t6x USING(a) NATURAL JOIN t6y"
    append sql " NATURAL JOIN t6z "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
  do_test where3-6.$cnt.7 {
    set sql "SELECT * FROM t6w NATURAL JOIN t6x JOIN t6y USING(a)"
    append sql " NATURAL JOIN t6z "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
  do_test where3-6.$cnt.8 {
    set sql "SELECT * FROM t6w NATURAL JOIN t6x NATURAL JOIN t6y"
    append sql " JOIN t6z USING(a) "
    append sql $::predicate
    db eval $sql
  } {1 w-one x-one y-one z-one 9 w-nine x-nine y-nine z-nine}
}


finish_test