176 lines
3.9 KiB
Plaintext
176 lines
3.9 KiB
Plaintext
# 2016 November 11
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# Test the virtual table interface. In particular the xBestIndex
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# method.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set testprefix bestindex4
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ifcapable !vtab {
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finish_test
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return
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}
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#-------------------------------------------------------------------------
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# Virtual table callback for a virtual table named $tbl.
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#
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# The table created is:
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#
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# "CREATE TABLE t1 (id, host, class)"
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#
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# The virtual table supports == operators on a subset of its columns. The
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# exact subset depends on the value of bitmask paramater $param.
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#
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# 0x01 - == on "id" supported
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# 0x02 - == on "host" supported
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# 0x04 - == on "class" supported
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#
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# $param also supports the following bits:
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#
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# 0x08 - ignore the "usable" flag (malfunction)
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#
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#
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#
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proc vtab_cmd {param method args} {
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switch -- $method {
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xConnect {
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return "CREATE TABLE t1(id TEXT, host TEXT, class TEXT)"
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}
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xBestIndex {
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foreach {clist orderby mask} $args {}
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set ret [list]
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set use use
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for {set i 0} {$i < [llength $clist]} {incr i} {
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array unset C
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array set C [lindex $clist $i]
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if { ($C(usable) || ($param & 0x08))
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&& $C(op)=="eq" && ($param & 1<<$C(column))
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} {
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lappend ret $use $i
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break
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}
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}
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set score 1000000
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if {$ret!=""} {
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set score [expr $score / [llength $ret]]
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}
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lappend ret cost $score rows $score
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return $ret
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}
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xFilter {
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}
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}
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return ""
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}
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register_tcl_module db
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for {set param1 0} {$param1<16} {incr param1} {
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for {set param2 0} {$param2<16} {incr param2} {
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reset_db
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register_tcl_module db
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do_execsql_test 1.$param1.$param2.1 "
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CREATE VIRTUAL TABLE t1 USING tcl('vtab_cmd $param1');
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CREATE VIRTUAL TABLE t2 USING tcl('vtab_cmd $param2');
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"
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foreach {tn sql} {
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2 "select t1.id as ID from t1, t2 where t1.id=t2.host and t2.class='xx'"
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3 {
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select t1.id as ID from t1, t2 where t2.class ='xx' and t2.id = t1.host
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}
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4 {
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select t1.id as ID from t1, t2 where t1.host = t2.id and t2. class ='xx'
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}
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} {
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if {($param1 & 0x08)==0 && ($param2 & 0x08)==0} {
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do_execsql_test 1.$param1.$param2.$tn.a $sql {}
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} else {
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do_test 1.$param1.$param2.$tn.b {
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catchsql $sql
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set {} {}
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} {}
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}
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}
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}
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}
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#-------------------------------------------------------------------------
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# Test that a parameter passed to a table-valued function cannot be
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# used to drive an index. i.e. that in the following:
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#
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# SELECT * FROM tbl, vtab(tbl.x);
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#
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# The implicit constraint "tbl.x = vtab.hidden" is not optimized using
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# an index on tbl.x.
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#
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reset_db
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register_tcl_module db
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proc vtab_command {method args} {
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switch -- $method {
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xConnect {
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return "CREATE TABLE t1(a, b, c, d HIDDEN)"
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}
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xBestIndex {
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set clist [lindex $args 0]
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if {[llength $clist]!=1} { error "unexpected constraint list" }
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catch { array unset C }
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array set C [lindex $clist 0]
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if {$C(usable)} {
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return [list omit 0 idxnum 555 rows 10 cost 100]
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}
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return [list cost 100000000]
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}
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}
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return {}
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}
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do_execsql_test 2.0 {
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CREATE VIRTUAL TABLE x1 USING tcl(vtab_command);
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CREATE TABLE t1 (x INT PRIMARY KEY);
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} {}
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do_eqp_test 2.1 {
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SELECT * FROM t1, x1 WHERE x1.d=t1.x;
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} {
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QUERY PLAN
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|--SCAN x1 VIRTUAL TABLE INDEX 0:
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`--SEARCH t1 USING COVERING INDEX sqlite_autoindex_t1_1 (x=?)
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}
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do_eqp_test 2.2 {
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SELECT * FROM t1, x1(t1.x)
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} {
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QUERY PLAN
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|--SCAN t1
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`--SCAN x1 VIRTUAL TABLE INDEX 555:
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}
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finish_test
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