142 lines
3.8 KiB
Plaintext
142 lines
3.8 KiB
Plaintext
# 2016 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.
|
|
#
|
|
#***********************************************************************
|
|
|
|
set testdir [file dirname $argv0]
|
|
source $testdir/tester.tcl
|
|
set testprefix bestindex2
|
|
|
|
ifcapable !vtab {
|
|
finish_test
|
|
return
|
|
}
|
|
|
|
#-------------------------------------------------------------------------
|
|
# Virtual table callback for table named $tbl, with the columns specified
|
|
# by list argument $cols. e.g. if the function is invoked as:
|
|
#
|
|
# vtab_cmd t1 {a b c} ...
|
|
#
|
|
# The table created is:
|
|
#
|
|
# "CREATE TABLE t1 (a, b, c)"
|
|
#
|
|
# The tables xBestIndex method behaves as if all possible combinations of
|
|
# "=" constraints (but no others) may be optimized. The cost of a full table
|
|
# scan is:
|
|
#
|
|
# "WHERE 1" "cost 1000000 rows 1000000"
|
|
#
|
|
# If one or more "=" constraints are in use, the cost and estimated number
|
|
# of rows returned are both is (11 - nCons)*1000, where nCons is the number
|
|
# of constraints used. e.g.
|
|
#
|
|
# "WHERE a=? AND b=?" -> "cost 900 rows 900"
|
|
# "WHERE c=? AND b<?" -> "cost 1000 rows 1000"
|
|
#
|
|
proc vtab_cmd {tbl cols method args} {
|
|
switch -- $method {
|
|
xConnect {
|
|
return "CREATE TABLE $tbl ([join $cols ,])"
|
|
}
|
|
xBestIndex {
|
|
foreach {clist orderby mask} $args {}
|
|
|
|
set cons [list]
|
|
set used [list]
|
|
|
|
for {set i 0} {$i < [llength $clist]} {incr i} {
|
|
array unset C
|
|
array set C [lindex $clist $i]
|
|
if {$C(op)=="eq" && $C(usable) && [lsearch $cons $C(column)]<0} {
|
|
lappend used use $i
|
|
lappend cons $C(column)
|
|
}
|
|
}
|
|
|
|
set nCons [llength $cons]
|
|
if {$nCons==0} {
|
|
return "cost 1000000 rows 1000000"
|
|
} else {
|
|
set cost [expr (11-$nCons) * 1000]
|
|
set ret [concat $used "cost $cost rows $cost"]
|
|
|
|
set txt [list]
|
|
foreach c $cons { lappend txt "[lindex $cols $c]=?" }
|
|
lappend ret idxstr "indexed([join $txt { AND }])"
|
|
|
|
return $ret
|
|
}
|
|
}
|
|
}
|
|
return ""
|
|
}
|
|
|
|
register_tcl_module db
|
|
|
|
do_execsql_test 1.0 {
|
|
CREATE VIRTUAL TABLE t1 USING tcl("vtab_cmd t1 {a b}");
|
|
CREATE VIRTUAL TABLE t2 USING tcl("vtab_cmd t2 {c d}");
|
|
CREATE VIRTUAL TABLE t3 USING tcl("vtab_cmd t3 {e f}");
|
|
}
|
|
|
|
do_eqp_test 1.1 {
|
|
SELECT * FROM t1 WHERE a='abc'
|
|
} {
|
|
0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 0:indexed(a=?)}
|
|
}
|
|
do_eqp_test 1.2 {
|
|
SELECT * FROM t1 WHERE a='abc' AND b='def'
|
|
} {
|
|
0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 0:indexed(a=? AND b=?)}
|
|
}
|
|
do_eqp_test 1.3 {
|
|
SELECT * FROM t1 WHERE a='abc' AND a='def'
|
|
} {
|
|
0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 0:indexed(a=?)}
|
|
}
|
|
do_eqp_test 1.4 {
|
|
SELECT * FROM t1,t2 WHERE c=a
|
|
} {
|
|
0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 0:}
|
|
0 1 1 {SCAN TABLE t2 VIRTUAL TABLE INDEX 0:indexed(c=?)}
|
|
}
|
|
|
|
do_eqp_test 1.5 {
|
|
SELECT * FROM t1, t2 CROSS JOIN t3 WHERE t2.c = +t1.b AND t3.e=t2.d
|
|
} {
|
|
0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 0:}
|
|
0 1 1 {SCAN TABLE t2 VIRTUAL TABLE INDEX 0:indexed(c=?)}
|
|
0 2 2 {SCAN TABLE t3 VIRTUAL TABLE INDEX 0:indexed(e=?)}
|
|
}
|
|
|
|
do_eqp_test 1.6 {
|
|
SELECT * FROM t1, t2, t3 WHERE t2.c = +t1.b AND t3.e = t2.d
|
|
} {
|
|
0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 0:}
|
|
0 1 1 {SCAN TABLE t2 VIRTUAL TABLE INDEX 0:indexed(c=?)}
|
|
0 2 2 {SCAN TABLE t3 VIRTUAL TABLE INDEX 0:indexed(e=?)}
|
|
}
|
|
|
|
do_execsql_test 1.7.1 {
|
|
CREATE TABLE x1(a, b);
|
|
}
|
|
do_eqp_test 1.7.2 {
|
|
SELECT * FROM x1 CROSS JOIN t1, t2, t3
|
|
WHERE t1.a = t2.c AND t1.b = t3.e
|
|
} {
|
|
0 0 0 {SCAN TABLE x1}
|
|
0 1 1 {SCAN TABLE t1 VIRTUAL TABLE INDEX 0:}
|
|
0 2 2 {SCAN TABLE t2 VIRTUAL TABLE INDEX 0:indexed(c=?)}
|
|
0 3 3 {SCAN TABLE t3 VIRTUAL TABLE INDEX 0:indexed(e=?)}
|
|
}
|
|
|
|
finish_test
|