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# 2011 March 3
#
# 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 tests for SQLite library. The focus of the tests
# in this file a corner-case query planner optimization involving the
# join order of two tables of different sizes.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !stat4 {
finish_test
return
}
set testprefix analyze6
proc eqp {sql {db db}} {
uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db
}
do_test analyze6-1.0 {
db eval {
CREATE TABLE cat(x INT, yz TEXT);
CREATE UNIQUE INDEX catx ON cat(x);
/* Give cat 16 unique integers */
INSERT INTO cat(x) VALUES(1);
INSERT INTO cat(x) VALUES(2);
INSERT INTO cat(x) SELECT x+2 FROM cat;
INSERT INTO cat(x) SELECT x+4 FROM cat;
INSERT INTO cat(x) SELECT x+8 FROM cat;
CREATE TABLE ev(y INT);
CREATE INDEX evy ON ev(y);
/* ev will hold 32 copies of 16 integers found in cat */
INSERT INTO ev SELECT x FROM cat;
INSERT INTO ev SELECT x FROM cat;
INSERT INTO ev SELECT y FROM ev;
INSERT INTO ev SELECT y FROM ev;
INSERT INTO ev SELECT y FROM ev;
INSERT INTO ev SELECT y FROM ev;
ANALYZE;
SELECT count(*) FROM cat;
SELECT count(*) FROM ev;
}
} {16 512}
# The lowest cost plan is to scan CAT and for each integer there, do a single
# lookup of the first corresponding entry in EV then read off the equal values
# in EV. (Prior to the 2011-03-04 enhancement to where.c, this query would
# have used EV for the outer loop instead of CAT - which was about 3x slower.)
#
do_test analyze6-1.1 {
eqp {SELECT count(*) FROM ev, cat WHERE x=y}
} {/*SCAN cat USING COVERING INDEX catx*SEARCH ev USING COVERING INDEX evy (y=?)*/}
# The same plan is chosen regardless of the order of the tables in the
# FROM clause.
#
do_eqp_test analyze6-1.2 {
SELECT count(*) FROM cat, ev WHERE x=y
} {
QUERY PLAN
|--SCAN cat USING COVERING INDEX catx
`--SEARCH ev USING COVERING INDEX evy (y=?)
}
# Ticket [83ea97620bd3101645138b7b0e71c12c5498fe3d] 2011-03-30
# If ANALYZE is run on an empty table, make sure indices are used
# on the table.
#
do_test analyze6-2.1 {
execsql {
CREATE TABLE t201(x INTEGER PRIMARY KEY, y UNIQUE, z);
CREATE INDEX t201z ON t201(z);
ANALYZE;
}
eqp {SELECT * FROM t201 WHERE z=5}
} {/*SEARCH t201 USING INDEX t201z (z=?)*/}
do_test analyze6-2.2 {
eqp {SELECT * FROM t201 WHERE y=5}
} {/*SEARCH t201 USING INDEX sqlite_autoindex_t201_1 (y=?)*/}
do_test analyze6-2.3 {
eqp {SELECT * FROM t201 WHERE x=5}
} {/*SEARCH t201 USING INTEGER PRIMARY KEY (rowid=?)*/}
do_test analyze6-2.4 {
execsql {
INSERT INTO t201 VALUES(1,2,3),(2,3,4),(3,4,5);
ANALYZE t201;
}
eqp {SELECT * FROM t201 WHERE z=5}
} {/*SEARCH t201 USING INDEX t201z (z=?)*/}
do_test analyze6-2.5 {
eqp {SELECT * FROM t201 WHERE y=5}
} {/*SEARCH t201 USING INDEX sqlite_autoindex_t201_1 (y=?)*/}
do_test analyze6-2.6 {
eqp {SELECT * FROM t201 WHERE x=5}
} {/*SEARCH t201 USING INTEGER PRIMARY KEY (rowid=?)*/}
do_test analyze6-2.7 {
execsql {
INSERT INTO t201 VALUES(4,5,7);
INSERT INTO t201 SELECT x+100, y+100, z+100 FROM t201;
INSERT INTO t201 SELECT x+200, y+200, z+200 FROM t201;
INSERT INTO t201 SELECT x+400, y+400, z+400 FROM t201;
ANALYZE t201;
}
eqp {SELECT * FROM t201 WHERE z=5}
} {/*SEARCH t201 USING INDEX t201z (z=?)*/}
do_test analyze6-2.8 {
eqp {SELECT * FROM t201 WHERE y=5}
} {/*SEARCH t201 USING INDEX sqlite_autoindex_t201_1 (y=?)*/}
do_test analyze6-2.9 {
eqp {SELECT * FROM t201 WHERE x=5}
} {/*SEARCH t201 USING INTEGER PRIMARY KEY (rowid=?)*/}
finish_test
|
