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# 2025-09-02
#
# 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 bestindexE
ifcapable !vtab {
finish_test
return
}
register_tcl_module db
proc pretty_constraint {lCol cons} {
array set C $cons
set ret ""
if {$C(usable)} {
set OP(eq) =
set ret "[lindex $lCol $C(column)]$OP($C(op))?"
}
return $ret
}
proc vtab_command {zName lCol method args} {
switch -- $method {
xConnect {
return "CREATE TABLE $zName ([join $lCol ,]) "
}
xBestIndex {
set hdl [lindex $args 0]
set conslist [$hdl constraints]
set ret [list]
foreach cons $conslist {
set pretty [pretty_constraint $lCol $cons]
if {$pretty != ""} { lappend ret $pretty }
}
lappend ::xBestIndex "$zName: [join $ret { AND }]"
return "cost 1000 rows 1000 idxnum 555"
}
}
return {}
}
proc do_bestindex_test {tn sql lCons} {
set ::xBestIndex [list]
do_execsql_test $tn.1 $sql
uplevel [list do_test $tn.2 [list set ::xBestIndex] [list {*}$lCons]]
}
proc create_vtab {tname clist} {
set cmd [list vtab_command $tname $clist]
execsql "
CREATE VIRTUAL TABLE $tname USING tcl('$cmd')
"
}
do_test 1.0 {
create_vtab x1 {a b c}
} {}
do_bestindex_test 1.1 {
SELECT * FROM x1 WHERE a=?
} {{x1: a=?}}
do_bestindex_test 1.2 {
SELECT * FROM x1 WHERE a=? AND b=?
} {{x1: a=? AND b=?}}
#--------------------------------------------------------------------------
reset_db
register_tcl_module db
do_test 2.0 {
create_vtab Delivery {id customer}
create_vtab ReturnDelivery {id customer}
create_vtab Customer {oid name}
} {}
do_bestindex_test 2.1 {
SELECT Delivery.ID, Customer.Name
FROM Delivery LEFT JOIN
Customer ON Delivery.Customer = Customer.OID
} {
{Delivery: }
{Customer: oid=?}
}
do_bestindex_test 2.2 {
SELECT * FROM
(
SELECT Delivery.ID, Customer.Name
FROM Delivery LEFT JOIN
Customer ON Delivery.Customer = Customer.OID
UNION
SELECT ReturnDelivery.ID, Customer.Name
FROM ReturnDelivery LEFT JOIN
Customer ON ReturnDelivery.Customer = Customer.OID
)
WHERE ID = 1
} {
{Delivery: id=?}
{Customer: oid=?}
{ReturnDelivery: id=?}
{Customer: oid=?}
}
#--------------------------------------------------------------------------
reset_db
register_tcl_module db eponymous_cmd
proc eponymous_cmd {method args} {
switch -- $method {
xConnect {
db eval { SELECT * FROM sqlite_schema }
return "CREATE TABLE t1 (a, b)"
}
xBestIndex {
return "idxnum 555"
}
xFilter {
return [list sql {SELECT 123, 'A', 'B'}]
}
xUpdate {
return 123
}
}
return {}
}
do_execsql_test 3.1.0 {
PRAGMA table_info = tcl
} {
0 a {} 0 {} 0 1 b {} 0 {} 0
}
do_execsql_test 3.1.1 {
SELECT rowid, * FROM tcl
} {123 A B}
do_execsql_test 3.1.2 {
INSERT INTO tcl VALUES('i', 'ii') RETURNING *;
} {i ii}
do_test 3.1.3 {
db last_insert_rowid
} {123}
do_execsql_test 3.1.4 {
CREATE TABLE x1(x);
}
db close
sqlite3 db test.db
register_tcl_module db eponymous_cmd
sqlite3 db2 test.db
# Load the schema into connection [db]
do_execsql_test 3.2.1 { SELECT * FROM x1 }
# Modify the schema on disk
do_execsql_test -db db2 3.2.2 { CREATE TABLE x2(x) }
# Insert with RETURNING trigger on eponymous table.
do_execsql_test 3.2.3 {
INSERT INTO tcl VALUES('i', 'ii') RETURNING *;
} {i ii}
finish_test
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