sqlite/test/eqp.test

# 2010 November 6
#
# 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.
#
#***********************************************************************
#

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

ifcapable !compound {
  finish_test
  return
}

set testprefix eqp

#-------------------------------------------------------------------------
#
# eqp-1.*:        Assorted tests.
# eqp-2.*:        Tests for single select statements.
# eqp-3.*:        Select statements that execute sub-selects.
# eqp-4.*:        Compound select statements.
# ...
# eqp-7.*:        "SELECT count(*) FROM tbl" statements (VDBE code OP_Count).
#

proc det {args} { uplevel do_eqp_test $args }

do_execsql_test 1.1 {
  CREATE TABLE t1(a, b);
  CREATE INDEX i1 ON t1(a);
  CREATE INDEX i2 ON t1(b);
  CREATE TABLE t2(a, b);
  CREATE TABLE t3(a, b);
}

do_eqp_test 1.2 {
  SELECT * FROM t2, t1 WHERE t1.a=1 OR t1.b=2;
} {
  0 0 1 {SEARCH TABLE t1 USING INDEX i1 (a=?)} 
  0 0 1 {SEARCH TABLE t1 USING INDEX i2 (b=?)} 
  0 1 0 {SCAN TABLE t2}
}
do_eqp_test 1.3 {
  SELECT * FROM t2 CROSS JOIN t1 WHERE t1.a=1 OR t1.b=2;
} {
  0 0 0 {SCAN TABLE t2}
  0 1 1 {SEARCH TABLE t1 USING INDEX i1 (a=?)} 
  0 1 1 {SEARCH TABLE t1 USING INDEX i2 (b=?)} 
}
do_eqp_test 1.3 {
  SELECT a FROM t1 ORDER BY a
} {
  0 0 0 {SCAN TABLE t1 USING COVERING INDEX i1}
}
do_eqp_test 1.4 {
  SELECT a FROM t1 ORDER BY +a
} {
  0 0 0 {SCAN TABLE t1 USING COVERING INDEX i1}
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
do_eqp_test 1.5 {
  SELECT a FROM t1 WHERE a=4
} {
  0 0 0 {SEARCH TABLE t1 USING COVERING INDEX i1 (a=?)}
}
do_eqp_test 1.6 {
  SELECT DISTINCT count(*) FROM t3 GROUP BY a;
} {
  0 0 0 {SCAN TABLE t3}
  0 0 0 {USE TEMP B-TREE FOR GROUP BY}
  0 0 0 {USE TEMP B-TREE FOR DISTINCT}
}

do_eqp_test 1.7 {
  SELECT * FROM t3 JOIN (SELECT 1)
} {
  0 0 1 {SCAN SUBQUERY 1}
  0 1 0 {SCAN TABLE t3}
}
do_eqp_test 1.8 {
  SELECT * FROM t3 JOIN (SELECT 1 UNION SELECT 2)
} {
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 USING TEMP B-TREE (UNION)}
  0 0 1 {SCAN SUBQUERY 1}
  0 1 0 {SCAN TABLE t3}
}
do_eqp_test 1.9 {
  SELECT * FROM t3 JOIN (SELECT 1 EXCEPT SELECT a FROM t3 LIMIT 17)
} {
  3 0 0 {SCAN TABLE t3}
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 USING TEMP B-TREE (EXCEPT)}
  0 0 1 {SCAN SUBQUERY 1}
  0 1 0 {SCAN TABLE t3}
}
do_eqp_test 1.10 {
  SELECT * FROM t3 JOIN (SELECT 1 INTERSECT SELECT a FROM t3 LIMIT 17)
} {
  3 0 0 {SCAN TABLE t3}
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 USING TEMP B-TREE (INTERSECT)}
  0 0 1 {SCAN SUBQUERY 1}
  0 1 0 {SCAN TABLE t3}
}

do_eqp_test 1.11 {
  SELECT * FROM t3 JOIN (SELECT 1 UNION ALL SELECT a FROM t3 LIMIT 17)
} {
  3 0 0 {SCAN TABLE t3}
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 (UNION ALL)}
  0 0 1 {SCAN SUBQUERY 1}
  0 1 0 {SCAN TABLE t3}
}

#-------------------------------------------------------------------------
# Test cases eqp-2.* - tests for single select statements.
#
drop_all_tables
do_execsql_test 2.1 {
  CREATE TABLE t1(x, y);

  CREATE TABLE t2(x, y);
  CREATE INDEX t2i1 ON t2(x);
}

det 2.2.1 "SELECT DISTINCT min(x), max(x) FROM t1 GROUP BY x ORDER BY 1" {
  0 0 0 {SCAN TABLE t1}
  0 0 0 {USE TEMP B-TREE FOR GROUP BY}
  0 0 0 {USE TEMP B-TREE FOR DISTINCT}
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
det 2.2.2 "SELECT DISTINCT min(x), max(x) FROM t2 GROUP BY x ORDER BY 1" {
  0 0 0 {SCAN TABLE t2 USING COVERING INDEX t2i1}
  0 0 0 {USE TEMP B-TREE FOR DISTINCT}
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
det 2.2.3 "SELECT DISTINCT * FROM t1" {
  0 0 0 {SCAN TABLE t1}
  0 0 0 {USE TEMP B-TREE FOR DISTINCT}
}
det 2.2.4 "SELECT DISTINCT * FROM t1, t2" {
  0 0 0 {SCAN TABLE t1}
  0 1 1 {SCAN TABLE t2}
  0 0 0 {USE TEMP B-TREE FOR DISTINCT}
}
det 2.2.5 "SELECT DISTINCT * FROM t1, t2 ORDER BY t1.x" {
  0 0 0 {SCAN TABLE t1}
  0 1 1 {SCAN TABLE t2}
  0 0 0 {USE TEMP B-TREE FOR DISTINCT}
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
det 2.2.6 "SELECT DISTINCT t2.x FROM t1, t2 ORDER BY t2.x" {
  0 0 1 {SCAN TABLE t2 USING COVERING INDEX t2i1}
  0 1 0 {SCAN TABLE t1}
}

det 2.3.1 "SELECT max(x) FROM t2" {
  0 0 0 {SEARCH TABLE t2 USING COVERING INDEX t2i1}
}
det 2.3.2 "SELECT min(x) FROM t2" {
  0 0 0 {SEARCH TABLE t2 USING COVERING INDEX t2i1}
}
det 2.3.3 "SELECT min(x), max(x) FROM t2" {
  0 0 0 {SCAN TABLE t2 USING COVERING INDEX t2i1}
}

det 2.4.1 "SELECT * FROM t1 WHERE rowid=?" {
  0 0 0 {SEARCH TABLE t1 USING INTEGER PRIMARY KEY (rowid=?)}
}



#-------------------------------------------------------------------------
# Test cases eqp-3.* - tests for select statements that use sub-selects.
#
do_eqp_test 3.1.1 {
  SELECT (SELECT x FROM t1 AS sub) FROM t1;
} {
  0 0 0 {SCAN TABLE t1}
  0 0 0 {EXECUTE SCALAR SUBQUERY 1}
  1 0 0 {SCAN TABLE t1 AS sub}
}
do_eqp_test 3.1.2 {
  SELECT * FROM t1 WHERE (SELECT x FROM t1 AS sub);
} {
  0 0 0 {SCAN TABLE t1}
  0 0 0 {EXECUTE SCALAR SUBQUERY 1}
  1 0 0 {SCAN TABLE t1 AS sub}
}
do_eqp_test 3.1.3 {
  SELECT * FROM t1 WHERE (SELECT x FROM t1 AS sub ORDER BY y);
} {
  0 0 0 {SCAN TABLE t1}
  0 0 0 {EXECUTE SCALAR SUBQUERY 1}
  1 0 0 {SCAN TABLE t1 AS sub}
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
do_eqp_test 3.1.4 {
  SELECT * FROM t1 WHERE (SELECT x FROM t2 ORDER BY x);
} {
  0 0 0 {SCAN TABLE t1}
  0 0 0 {EXECUTE SCALAR SUBQUERY 1}
  1 0 0 {SCAN TABLE t2 USING COVERING INDEX t2i1}
}

det 3.2.1 {
  SELECT * FROM (SELECT * FROM t1 ORDER BY x LIMIT 10) ORDER BY y LIMIT 5
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY} 
  0 0 0 {SCAN SUBQUERY 1} 
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}
det 3.2.2 {
  SELECT * FROM 
    (SELECT * FROM t1 ORDER BY x LIMIT 10) AS x1,
    (SELECT * FROM t2 ORDER BY x LIMIT 10) AS x2
  ORDER BY x2.y LIMIT 5
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY} 
  2 0 0 {SCAN TABLE t2 USING INDEX t2i1} 
  0 0 0 {SCAN SUBQUERY 1 AS x1} 
  0 1 1 {SCAN SUBQUERY 2 AS x2} 
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}

det 3.3.1 {
  SELECT * FROM t1 WHERE y IN (SELECT y FROM t2)
} {
  0 0 0 {SCAN TABLE t1} 
  0 0 0 {EXECUTE LIST SUBQUERY 1} 
  1 0 0 {SCAN TABLE t2}
}
det 3.3.2 {
  SELECT * FROM t1 WHERE y IN (SELECT y FROM t2 WHERE t1.x!=t2.x)
} {
  0 0 0 {SCAN TABLE t1} 
  0 0 0 {EXECUTE CORRELATED LIST SUBQUERY 1} 
  1 0 0 {SCAN TABLE t2}
}
det 3.3.3 {
  SELECT * FROM t1 WHERE EXISTS (SELECT y FROM t2 WHERE t1.x!=t2.x)
} {
  0 0 0 {SCAN TABLE t1} 
  0 0 0 {EXECUTE CORRELATED SCALAR SUBQUERY 1} 
  1 0 0 {SCAN TABLE t2}
}

#-------------------------------------------------------------------------
# Test cases eqp-4.* - tests for composite select statements.
#
do_eqp_test 4.1.1 {
  SELECT * FROM t1 UNION ALL SELECT * FROM t2
} {
  1 0 0 {SCAN TABLE t1} 
  2 0 0 {SCAN TABLE t2} 
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (UNION ALL)} 
}
do_eqp_test 4.1.2 {
  SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY 2
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (UNION ALL)} 
}
do_eqp_test 4.1.3 {
  SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY 2
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (UNION)} 
}
do_eqp_test 4.1.4 {
  SELECT * FROM t1 INTERSECT SELECT * FROM t2 ORDER BY 2
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (INTERSECT)} 
}
do_eqp_test 4.1.5 {
  SELECT * FROM t1 EXCEPT SELECT * FROM t2 ORDER BY 2
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)} 
}

do_eqp_test 4.2.2 {
  SELECT * FROM t1 UNION ALL SELECT * FROM t2 ORDER BY 1
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2 USING INDEX t2i1} 
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (UNION ALL)} 
}
do_eqp_test 4.2.3 {
  SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY 1
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (UNION)} 
}
do_eqp_test 4.2.4 {
  SELECT * FROM t1 INTERSECT SELECT * FROM t2 ORDER BY 1
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (INTERSECT)} 
}
do_eqp_test 4.2.5 {
  SELECT * FROM t1 EXCEPT SELECT * FROM t2 ORDER BY 1
} {
  1 0 0 {SCAN TABLE t1} 
  1 0 0 {USE TEMP B-TREE FOR ORDER BY}
  2 0 0 {SCAN TABLE t2} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)} 
}

do_eqp_test 4.3.1 {
  SELECT x FROM t1 UNION SELECT x FROM t2
} {
  1 0 0 {SCAN TABLE t1} 
  2 0 0 {SCAN TABLE t2 USING COVERING INDEX t2i1} 
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 USING TEMP B-TREE (UNION)} 
}

do_eqp_test 4.3.2 {
  SELECT x FROM t1 UNION SELECT x FROM t2 UNION SELECT x FROM t1
} {
  2 0 0 {SCAN TABLE t1} 
  3 0 0 {SCAN TABLE t2 USING COVERING INDEX t2i1} 
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 USING TEMP B-TREE (UNION)}
  4 0 0 {SCAN TABLE t1} 
  0 0 0 {COMPOUND SUBQUERIES 1 AND 4 USING TEMP B-TREE (UNION)}
}
do_eqp_test 4.3.3 {
  SELECT x FROM t1 UNION SELECT x FROM t2 UNION SELECT x FROM t1 ORDER BY 1
} {
  2 0 0 {SCAN TABLE t1} 
  2 0 0 {USE TEMP B-TREE FOR ORDER BY} 
  3 0 0 {SCAN TABLE t2 USING COVERING INDEX t2i1} 
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 (UNION)} 
  4 0 0 {SCAN TABLE t1} 
  4 0 0 {USE TEMP B-TREE FOR ORDER BY} 
  0 0 0 {COMPOUND SUBQUERIES 1 AND 4 (UNION)}
}

#-------------------------------------------------------------------------
# This next block of tests verifies that the examples on the 
# lang_explain.html page are correct.
#
drop_all_tables

# EVIDENCE-OF: R-47779-47605 sqlite> EXPLAIN QUERY PLAN SELECT a, b
# FROM t1 WHERE a=1;
# 0|0|0|SCAN TABLE t1
#
do_execsql_test 5.1.0 { CREATE TABLE t1(a, b) }
det 5.1.1 "SELECT a, b FROM t1 WHERE a=1" {
  0 0 0 {SCAN TABLE t1}
}

# EVIDENCE-OF: R-55852-17599 sqlite> CREATE INDEX i1 ON t1(a);
# sqlite> EXPLAIN QUERY PLAN SELECT a, b FROM t1 WHERE a=1;
# 0|0|0|SEARCH TABLE t1 USING INDEX i1
#
do_execsql_test 5.2.0 { CREATE INDEX i1 ON t1(a) }
det 5.2.1 "SELECT a, b FROM t1 WHERE a=1" {
  0 0 0 {SEARCH TABLE t1 USING INDEX i1 (a=?)}
}

# EVIDENCE-OF: R-21179-11011 sqlite> CREATE INDEX i2 ON t1(a, b);
# sqlite> EXPLAIN QUERY PLAN SELECT a, b FROM t1 WHERE a=1;
# 0|0|0|SEARCH TABLE t1 USING COVERING INDEX i2 (a=?)
#
do_execsql_test 5.3.0 { CREATE INDEX i2 ON t1(a, b) }
det 5.3.1 "SELECT a, b FROM t1 WHERE a=1" {
  0 0 0 {SEARCH TABLE t1 USING COVERING INDEX i2 (a=?)}
}

# EVIDENCE-OF: R-09991-48941 sqlite> EXPLAIN QUERY PLAN
# SELECT t1.*, t2.* FROM t1, t2 WHERE t1.a=1 AND t1.b>2;
# 0|0|0|SEARCH TABLE t1 USING COVERING INDEX i2 (a=? AND b>?)
# 0|1|1|SCAN TABLE t2
#
do_execsql_test 5.4.0 {CREATE TABLE t2(c, d)}
det 5.4.1 "SELECT t1.*, t2.* FROM t1, t2 WHERE t1.a=1 AND t1.b>2" {
  0 0 0 {SEARCH TABLE t1 USING COVERING INDEX i2 (a=? AND b>?)}
  0 1 1 {SCAN TABLE t2}
}

# EVIDENCE-OF: R-33626-61085 sqlite> EXPLAIN QUERY PLAN
# SELECT t1.*, t2.* FROM t2, t1 WHERE t1.a=1 AND t1.b>2;
# 0|0|1|SEARCH TABLE t1 USING COVERING INDEX i2 (a=? AND b>?)
# 0|1|0|SCAN TABLE t2
#
det 5.5 "SELECT t1.*, t2.* FROM t2, t1 WHERE t1.a=1 AND t1.b>2" {
  0 0 1 {SEARCH TABLE t1 USING COVERING INDEX i2 (a=? AND b>?)}
  0 1 0 {SCAN TABLE t2}
}

# EVIDENCE-OF: R-04002-25654 sqlite> CREATE INDEX i3 ON t1(b);
# sqlite> EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=1 OR b=2;
# 0|0|0|SEARCH TABLE t1 USING COVERING INDEX i2 (a=?)
# 0|0|0|SEARCH TABLE t1 USING INDEX i3 (b=?)
#
do_execsql_test 5.5.0 {CREATE INDEX i3 ON t1(b)}
det 5.6.1 "SELECT * FROM t1 WHERE a=1 OR b=2" {
  0 0 0 {SEARCH TABLE t1 USING COVERING INDEX i2 (a=?)}
  0 0 0 {SEARCH TABLE t1 USING INDEX i3 (b=?)}
}

# EVIDENCE-OF: R-24577-38891 sqlite> EXPLAIN QUERY PLAN
# SELECT c, d FROM t2 ORDER BY c;
# 0|0|0|SCAN TABLE t2
# 0|0|0|USE TEMP B-TREE FOR ORDER BY
#
det 5.7 "SELECT c, d FROM t2 ORDER BY c" {
  0 0 0 {SCAN TABLE t2}
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}

# EVIDENCE-OF: R-58157-12355 sqlite> CREATE INDEX i4 ON t2(c);
# sqlite> EXPLAIN QUERY PLAN SELECT c, d FROM t2 ORDER BY c;
# 0|0|0|SCAN TABLE t2 USING INDEX i4
#
do_execsql_test 5.8.0 {CREATE INDEX i4 ON t2(c)}
det 5.8.1 "SELECT c, d FROM t2 ORDER BY c" {
  0 0 0 {SCAN TABLE t2 USING INDEX i4}
}

# EVIDENCE-OF: R-13931-10421 sqlite> EXPLAIN QUERY PLAN SELECT
# (SELECT b FROM t1 WHERE a=0), (SELECT a FROM t1 WHERE b=t2.c) FROM t2;
# 0|0|0|SCAN TABLE t2
# 0|0|0|EXECUTE SCALAR SUBQUERY 1
# 1|0|0|SEARCH TABLE t1 USING COVERING INDEX i2 (a=?)
# 0|0|0|EXECUTE CORRELATED SCALAR SUBQUERY 2
# 2|0|0|SEARCH TABLE t1 USING INDEX i3 (b=?)
#
det 5.9 {
  SELECT (SELECT b FROM t1 WHERE a=0), (SELECT a FROM t1 WHERE b=t2.c) FROM t2
} {
  0 0 0 {SCAN TABLE t2 USING COVERING INDEX i4}
  0 0 0 {EXECUTE SCALAR SUBQUERY 1}
  1 0 0 {SEARCH TABLE t1 USING COVERING INDEX i2 (a=?)}
  0 0 0 {EXECUTE CORRELATED SCALAR SUBQUERY 2}
  2 0 0 {SEARCH TABLE t1 USING INDEX i3 (b=?)}
}

# EVIDENCE-OF: R-50892-45943 sqlite> EXPLAIN QUERY PLAN
# SELECT count(*) FROM (SELECT max(b) AS x FROM t1 GROUP BY a) GROUP BY x;
# 1|0|0|SCAN TABLE t1 USING COVERING INDEX i2
# 0|0|0|SCAN SUBQUERY 1
# 0|0|0|USE TEMP B-TREE FOR GROUP BY
#
det 5.10 {
  SELECT count(*) FROM (SELECT max(b) AS x FROM t1 GROUP BY a) GROUP BY x
} {
  1 0 0 {SCAN TABLE t1 USING COVERING INDEX i2}
  0 0 0 {SCAN SUBQUERY 1}
  0 0 0 {USE TEMP B-TREE FOR GROUP BY}
}

# EVIDENCE-OF: R-46219-33846 sqlite> EXPLAIN QUERY PLAN
# SELECT * FROM (SELECT * FROM t2 WHERE c=1), t1;
# 0|0|0|SEARCH TABLE t2 USING INDEX i4 (c=?)
# 0|1|1|SCAN TABLE t1
#
det 5.11 "SELECT * FROM (SELECT * FROM t2 WHERE c=1), t1" {
  0 0 0 {SEARCH TABLE t2 USING INDEX i4 (c=?)}
  0 1 1 {SCAN TABLE t1 USING COVERING INDEX i2}
}

# EVIDENCE-OF: R-37879-39987 sqlite> EXPLAIN QUERY PLAN
# SELECT a FROM t1 UNION SELECT c FROM t2;
# 1|0|0|SCAN TABLE t1
# 2|0|0|SCAN TABLE t2
# 0|0|0|COMPOUND SUBQUERIES 1 AND 2 USING TEMP B-TREE (UNION)
#
det 5.12 "SELECT a FROM t1 UNION SELECT c FROM t2" {
  1 0 0 {SCAN TABLE t1 USING COVERING INDEX i2}
  2 0 0 {SCAN TABLE t2 USING COVERING INDEX i4}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 USING TEMP B-TREE (UNION)}
}

# EVIDENCE-OF: R-44864-63011 sqlite> EXPLAIN QUERY PLAN
# SELECT a FROM t1 EXCEPT SELECT d FROM t2 ORDER BY 1;
# 1|0|0|SCAN TABLE t1 USING COVERING INDEX i2
# 2|0|0|SCAN TABLE t2 2|0|0|USE TEMP B-TREE FOR ORDER BY
# 0|0|0|COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)
#
det 5.13 "SELECT a FROM t1 EXCEPT SELECT d FROM t2 ORDER BY 1" {
  1 0 0 {SCAN TABLE t1 USING COVERING INDEX i2}
  2 0 0 {SCAN TABLE t2}
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)}
}


#-------------------------------------------------------------------------
# The following tests - eqp-6.* - test that the example C code on 
# documentation page eqp.html works. The C code is duplicated in test1.c
# and wrapped in Tcl command [print_explain_query_plan] 
#
set boilerplate {
  proc explain_query_plan {db sql} {
    set stmt [sqlite3_prepare_v2 db $sql -1 DUMMY]
    print_explain_query_plan $stmt
    sqlite3_finalize $stmt
  }
  sqlite3 db test.db
  explain_query_plan db {%SQL%}
  db close
  exit
}

# Do a "Print Explain Query Plan" test.
proc do_peqp_test {tn sql res} {
  set fd [open script.tcl w]
  puts $fd [string map [list %SQL% $sql] $::boilerplate]
  close $fd

  uplevel do_test $tn [list {
    set fd [open "|[info nameofexec] script.tcl"]
    set data [read $fd]
    close $fd
    set data
  }] [list $res]
}

do_peqp_test 6.1 {
  SELECT a FROM t1 EXCEPT SELECT d FROM t2 ORDER BY 1
} [string trimleft {
1 0 0 SCAN TABLE t1 USING COVERING INDEX i2
2 0 0 SCAN TABLE t2
2 0 0 USE TEMP B-TREE FOR ORDER BY
0 0 0 COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)
}]

#-------------------------------------------------------------------------
# The following tests - eqp-7.* - test that queries that use the OP_Count
# optimization return something sensible with EQP.
#
drop_all_tables

do_execsql_test 7.0 {
  CREATE TABLE t1(a, b);
  CREATE TABLE t2(a, b);
  CREATE INDEX i1 ON t2(a);
}

det 7.1 "SELECT count(*) FROM t1" {
  0 0 0 {SCAN TABLE t1}
}

det 7.2 "SELECT count(*) FROM t2" {
  0 0 0 {SCAN TABLE t2 USING COVERING INDEX i1}
}

do_execsql_test 7.3 {
  INSERT INTO t1 VALUES(1, 2);
  INSERT INTO t1 VALUES(3, 4);

  INSERT INTO t2 VALUES(1, 2);
  INSERT INTO t2 VALUES(3, 4);
  INSERT INTO t2 VALUES(5, 6);
 
  ANALYZE;
}

db close
sqlite3 db test.db

det 7.4 "SELECT count(*) FROM t1" {
  0 0 0 {SCAN TABLE t1}
}

det 7.5 "SELECT count(*) FROM t2" {
  0 0 0 {SCAN TABLE t2 USING COVERING INDEX i1}
}


finish_test