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# 2024-08-03
#
# 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 bestindexD
ifcapable !vtab {
finish_test
return
}
register_tcl_module db
proc vtab_command {method args} {
switch -- $method {
xConnect {
return "CREATE TABLE t1(a PRIMARY KEY, b, c) WITHOUT ROWID"
}
xBestIndex {
set hdl [lindex $args 0]
set ::colUsed [$hdl mask]
set cost 1000000
set used ""
set cons 0
foreach c [$hdl constraints] {
set cost [expr $cost/10]
append used " use $cons"
incr cons
}
return "cost $cost rows $cost $used"
}
}
return {}
}
do_execsql_test 1.0 {
CREATE VIRTUAL TABLE x1 USING tcl(vtab_command);
CREATE TABLE t2(a, b);
} {}
# This proc assumes that there is only one use of a virtual table - x1 -
# in SQL statement $sql. It tests that the colUsed value passed to the
# xBestIndex method matches the actual columns used, which is ascertained
# by searching the compiled VM code for VColumn instructions.
#
proc do_colsused_test {tn sql} {
set ::colUsed ""
execsql $sql
set got $::colUsed
set expect 0
db eval "EXPLAIN $sql" x {
if {$x(opcode)=="VColumn"} {
set expect [expr $expect | (1<<$x(p2))]
}
}
uplevel [list do_test $tn.($expect/$got) [list expr ($expect & $got)] $expect]
}
do_colsused_test 1.1 { SELECT a FROM x1 }
do_colsused_test 1.2 { SELECT a,c FROM x1 }
do_colsused_test 1.3 { SELECT b FROM x1 }
do_colsused_test 1.4 { SELECT b FROM x1 WHERE c=? }
do_colsused_test 1.5 {
select 1 from t2 full join x1;
}
do_colsused_test 1.6 {
select 1 from x1 WHERE (b=? AND c=?) OR (b=? AND c=?)
}
finish_test
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