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145 lines (127 loc) · 3.73 KB
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# 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 {
set hdl [lindex $args 0]
set clist [$hdl constraints]
set orderby [$hdl orderby]
set mask [$hdl mask]
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'
} {SCAN t1 VIRTUAL TABLE INDEX 0:indexed(a=?)}
do_eqp_test 1.2 {
SELECT * FROM t1 WHERE a='abc' AND b='def'
} {SCAN t1 VIRTUAL TABLE INDEX 0:indexed(a=? AND b=?)}
do_eqp_test 1.3 {
SELECT * FROM t1 WHERE a='abc' AND a='def'
} {SCAN t1 VIRTUAL TABLE INDEX 0:indexed(a=?)}
do_eqp_test 1.4 {
SELECT * FROM t1,t2 WHERE c=a
} {
QUERY PLAN
|--SCAN t1 VIRTUAL TABLE INDEX 0:
`--SCAN 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
} {
QUERY PLAN
|--SCAN t1 VIRTUAL TABLE INDEX 0:
|--SCAN t2 VIRTUAL TABLE INDEX 0:indexed(c=?)
`--SCAN 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
} {
QUERY PLAN
|--SCAN t1 VIRTUAL TABLE INDEX 0:
|--SCAN t2 VIRTUAL TABLE INDEX 0:indexed(c=?)
`--SCAN 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
} {
QUERY PLAN
|--SCAN x1
|--SCAN t1 VIRTUAL TABLE INDEX 0:
|--SCAN t2 VIRTUAL TABLE INDEX 0:indexed(c=?)
`--SCAN t3 VIRTUAL TABLE INDEX 0:indexed(e=?)
}
finish_test