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Overview
Comment:Add EXPLAIN QUERY PLAN test cases to check that the examples in the documentation work.
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SHA1: 85fdad850a4da33fd74f5394b921a63ea6b40bdb
User & Date: dan 2010-11-12 17:41:38
Context
2010-11-13
16:42
Change the EXPLAIN QUERY PLAN output to use "USING INDEX" instead of "BY INDEX", and to use "SEARCH" instead of "SCAN" for loops that are not full-table scans. Closed-Leaf check-in: 6611b76b user: dan tags: experimental
2010-11-12
17:41
Add EXPLAIN QUERY PLAN test cases to check that the examples in the documentation work. check-in: 85fdad85 user: dan tags: experimental
15:36
Reduce the number of branches that need to be tested in the explainIndexRange() function of where.c. check-in: 6fdae9a6 user: drh tags: experimental
Changes
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Changes to test/eqp.test.

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  2 0 0 {USE TEMP B-TREE FOR ORDER BY} 
  3 0 0 {SCAN TABLE t2 BY COVERING INDEX t2i1 (~1000000 rows)} 
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 (UNION)} 
  4 0 0 {SCAN TABLE t1 (~1000000 rows)} 
  4 0 0 {USE TEMP B-TREE FOR ORDER BY} 
  0 0 0 {COMPOUND SUBQUERIES 1 AND 4 (UNION)}
}









































































































































finish_test









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  2 0 0 {USE TEMP B-TREE FOR ORDER BY} 
  3 0 0 {SCAN TABLE t2 BY COVERING INDEX t2i1 (~1000000 rows)} 
  1 0 0 {COMPOUND SUBQUERIES 2 AND 3 (UNION)} 
  4 0 0 {SCAN TABLE t1 (~1000000 rows)} 
  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-64208-08323 sqlite> EXPLAIN QUERY PLAN SELECT a, b
# FROM t1 WHERE a=1; 0|0|0|SCAN TABLE t1 (~100000 rows)
#
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 (~100000 rows)}
}

# EVIDENCE-OF: R-03114-52867 sqlite> CREATE INDEX i1 ON t1(a);
# sqlite> EXPLAIN QUERY PLAN SELECT a, b FROM t1 WHERE a=1;
# 0|0|0|SCAN TABLE t1 BY INDEX i1 (a=?) (~10 rows)
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 {SCAN TABLE t1 BY INDEX i1 (a=?) (~10 rows)}
}

# EVIDENCE-OF: R-20407-61322 sqlite> CREATE INDEX i2 ON t1(a, b);
# sqlite> EXPLAIN QUERY PLAN SELECT a, b FROM t1 WHERE a=1;
# 0|0|0|SCAN TABLE t1 BY COVERING INDEX i2 (a=?) (~10 rows)
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 {SCAN TABLE t1 BY COVERING INDEX i2 (a=?) (~10 rows)}
}

# EVIDENCE-OF: R-01893-00096 sqlite> EXPLAIN QUERY PLAN SELECT t1.*,
# t2.* FROM t1, t2 WHERE t1.a=1 AND t1.b>2; 0|0|0|SCAN TABLE t1 BY
# COVERING INDEX i2 (a=? AND b>?) (~3 rows) 0|1|1|SCAN TABLE t2
# (~1000000 rows)
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 {SCAN TABLE t1 BY COVERING INDEX i2 (a=? AND b>?) (~3 rows)}
  0 1 1 {SCAN TABLE t2 (~1000000 rows)}
}

# EVIDENCE-OF: R-26531-36629 sqlite> EXPLAIN QUERY PLAN SELECT t1.*,
# t2.* FROM t2, t1 WHERE t1.a=1 AND t1.b>2; 0|0|1|SCAN TABLE t1 BY
# COVERING INDEX i2 (a=? AND b>?) (~3 rows) 0|1|0|SCAN TABLE t2
# (~1000000 rows)
det 5.5 "SELECT t1.*, t2.* FROM t2, t1 WHERE t1.a=1 AND t1.b>2" {
  0 0 1 {SCAN TABLE t1 BY COVERING INDEX i2 (a=? AND b>?) (~3 rows)}
  0 1 0 {SCAN TABLE t2 (~1000000 rows)}
}

# EVIDENCE-OF: R-17671-37431 sqlite> CREATE INDEX i3 ON t1(b);
# sqlite> EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE a=1 OR b=2;
# 0|0|0|SCAN TABLE t1 BY COVERING INDEX i2 (a=?) (~10 rows) 0|0|0|SCAN
# TABLE t1 BY INDEX i3 (b=?) (~10 rows)
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 {SCAN TABLE t1 BY COVERING INDEX i2 (a=?) (~10 rows)}
  0 0 0 {SCAN TABLE t1 BY INDEX i3 (b=?) (~10 rows)}
}

# EVIDENCE-OF: R-33025-54904 sqlite> EXPLAIN QUERY PLAN SELECT c, d
# FROM t2 ORDER BY c; 0|0|0|SCAN TABLE t2 (~1000000 rows) 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 (~1000000 rows)}
  0 0 0 {USE TEMP B-TREE FOR ORDER BY}
}

# EVIDENCE-OF: R-08354-12138 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 BY INDEX i4 (~1000000 rows)
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 BY INDEX i4 (~1000000 rows)}
}

# EVIDENCE-OF: R-01895-58356 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 (~1000000 rows) 0|0|0|EXECUTE SCALAR SUBQUERY 1
# 1|0|0|SCAN TABLE t1 BY COVERING INDEX i2 (a=?) (~10 rows)
# 0|0|0|EXECUTE CORRELATED SCALAR SUBQUERY 2 2|0|0|SCAN TABLE t1 BY
# INDEX i3 (b=?) (~10 rows)
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 (~1000000 rows)}
  0 0 0 {EXECUTE SCALAR SUBQUERY 1}
  1 0 0 {SCAN TABLE t1 BY COVERING INDEX i2 (a=?) (~10 rows)}
  0 0 0 {EXECUTE CORRELATED SCALAR SUBQUERY 2}
  2 0 0 {SCAN TABLE t1 BY INDEX i3 (b=?) (~10 rows)}
}

# EVIDENCE-OF: R-43933-45972 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 BY COVERING INDEX i2 (~1000000 rows) 0|0|0|SCAN
# SUBQUERY 1 (~1000000 rows) 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 BY COVERING INDEX i2 (~1000000 rows)}
  0 0 0 {SCAN SUBQUERY 1 (~1000000 rows)}
  0 0 0 {USE TEMP B-TREE FOR GROUP BY}
}

# EVIDENCE-OF: R-15989-23611 sqlite> EXPLAIN QUERY PLAN SELECT * FROM
# (SELECT * FROM t2 WHERE c=1), t1; 0|0|0|SCAN TABLE t2 BY INDEX i4
# (c=?) (~10 rows) 0|1|1|SCAN TABLE t1 (~1000000 rows)
det 5.11 "SELECT * FROM (SELECT * FROM t2 WHERE c=1), t1" {
  0 0 0 {SCAN TABLE t2 BY INDEX i4 (c=?) (~10 rows)}
  0 1 1 {SCAN TABLE t1 (~1000000 rows)}
}

# EVIDENCE-OF: R-40701-42164 sqlite> EXPLAIN QUERY PLAN SELECT a FROM
# t1 UNION SELECT c FROM t2; 1|0|0|SCAN TABLE t1 (~1000000 rows)
# 2|0|0|SCAN TABLE t2 (~1000000 rows) 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 (~1000000 rows)}
  2 0 0 {SCAN TABLE t2 (~1000000 rows)}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 USING TEMP B-TREE (UNION)}
}

# EVIDENCE-OF: R-34523-61710 sqlite> EXPLAIN QUERY PLAN SELECT a FROM
# t1 EXCEPT SELECT d FROM t2 ORDER BY 1; 1|0|0|SCAN TABLE t1 BY COVERING
# INDEX i2 (~1000000 rows) 2|0|0|SCAN TABLE t2 (~1000000 rows) 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 BY COVERING INDEX i2 (~1000000 rows)}
  2 0 0 {SCAN TABLE t2 (~1000000 rows)}
  2 0 0 {USE TEMP B-TREE FOR ORDER BY}
  0 0 0 {COMPOUND SUBQUERIES 1 AND 2 (EXCEPT)}
}





finish_test