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# 2020-01-29
#
# 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 bestindexA
ifcapable !vtab {
finish_test
return
}
proc vtab_command {method args} {
switch -- $method {
xConnect {
return "CREATE TABLE x(a, b, c)"
}
xBestIndex {
set hdl [lindex $args 0]
set clist [$hdl constraints]
foreach c $clist {
array set C $c
lappend ::vtab_constraints [list $C(op) $C(column)]
}
return [list]
}
xFilter {
return ""
}
xFindFunction {
foreach {nArg name} $args {}
if {$nArg==2 && $name=="even"} {
return 152
}
return 0
}
}
return {}
}
register_tcl_module db
do_execsql_test 1.0 {
CREATE VIRTUAL TABLE t1 USING tcl(vtab_command);
}
proc do_xbestindex_test {tn sql res} {
set script [subst {
execsql "$sql"
set ::vtab_constraints
}]
uplevel [list do_test $tn $script [list {*}$res]]
set ::vtab_constraints [list]
}
do_xbestindex_test 1.1 {
SELECT * FROM t1 WHERE a=?
} {
{eq 0}
}
do_xbestindex_test 1.2 {
SELECT * FROM t1 WHERE a=? LIMIT 10
} {
{eq 0}
{limit 0}
}
do_xbestindex_test 1.3 {
SELECT * FROM t1 WHERE a=? AND (b+1)=? LIMIT 10
} {
{eq 0}
}
proc error_function {args} { error "not a function!" }
db function even error_function
do_xbestindex_test 1.4 {
SELECT * FROM t1 WHERE even(a, ?)
} {
{152 0}
}
do_xbestindex_test 1.5 {
SELECT * FROM t1 WHERE b=10 AND even(a, ?)
} {
{eq 1}
{152 0}
}
do_xbestindex_test 1.6 {
SELECT * FROM t1 WHERE b=10 LIMIT 10
} {
{eq 1}
{limit 0}
}
do_xbestindex_test 1.7 {
SELECT * FROM t1 WHERE even(b,?) LIMIT 10
} {
{152 1}
{limit 0}
}
do_xbestindex_test 1.8 {
SELECT * FROM t1 WHERE b!=? LIMIT 10
} {
{ne 1}
{limit 0}
}
do_xbestindex_test 1.9 {
SELECT * FROM t1 WHERE ?=a LIMIT 10
} {
{eq 0}
{limit 0}
}
finish_test
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