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Diffstat (limited to '')
| -rw-r--r-- | test/bestindex4.test | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/test/bestindex4.test b/test/bestindex4.test new file mode 100644 index 0000000..483656d --- /dev/null +++ b/test/bestindex4.test @@ -0,0 +1,182 @@ +# 2016 November 11 +# +# 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. +# +#*********************************************************************** +# Test the virtual table interface. In particular the xBestIndex +# method. +# + +set testdir [file dirname $argv0] +source $testdir/tester.tcl +set testprefix bestindex4 + +ifcapable !vtab { + finish_test + return +} + +#------------------------------------------------------------------------- +# Virtual table callback for a virtual table named $tbl. +# +# The table created is: +# +# "CREATE TABLE t1 (id, host, class)" +# +# The virtual table supports == operators on a subset of its columns. The +# exact subset depends on the value of bitmask paramater $param. +# +# 0x01 - == on "id" supported +# 0x02 - == on "host" supported +# 0x04 - == on "class" supported +# +# $param also supports the following bits: +# +# 0x08 - ignore the "usable" flag (malfunction) +# +# +# +proc vtab_cmd {param method args} { + switch -- $method { + xConnect { + return "CREATE TABLE t1(id TEXT, host TEXT, class TEXT)" + } + + xBestIndex { + set hdl [lindex $args 0] + set clist [$hdl constraints] + set orderby [$hdl orderby] + set mask [$hdl mask] + + set ret [list] + + set use use + + + for {set i 0} {$i < [llength $clist]} {incr i} { + array unset C + array set C [lindex $clist $i] + if { ($C(usable) || ($param & 0x08)) + && $C(op)=="eq" && ($param & 1<<$C(column)) + } { + lappend ret $use $i + break + } + } + + set score 1000000 + if {$ret!=""} { + set score [expr $score / [llength $ret]] + } + lappend ret cost $score rows $score + + return $ret + } + + xFilter { + } + } + return "" +} + +register_tcl_module db + +for {set param1 0} {$param1<16} {incr param1} { + for {set param2 0} {$param2<16} {incr param2} { + reset_db + register_tcl_module db + do_execsql_test 1.$param1.$param2.1 " + CREATE VIRTUAL TABLE t1 USING tcl('vtab_cmd $param1'); + CREATE VIRTUAL TABLE t2 USING tcl('vtab_cmd $param2'); + " + + foreach {tn sql} { + 2 "select t1.id as ID from t1, t2 where t1.id=t2.host and t2.class='xx'" + 3 { + select t1.id as ID from t1, t2 where t2.class ='xx' and t2.id = t1.host + } + 4 { + select t1.id as ID from t1, t2 where t1.host = t2.id and t2. class ='xx' + } + } { + + if {($param1 & 0x08)==0 && ($param2 & 0x08)==0} { + + do_execsql_test 1.$param1.$param2.$tn.a $sql {} + + } else { + do_test 1.$param1.$param2.$tn.b { + catchsql $sql + set {} {} + } {} + } + } + + } +} + +#------------------------------------------------------------------------- +# Test that a parameter passed to a table-valued function cannot be +# used to drive an index. i.e. that in the following: +# +# SELECT * FROM tbl, vtab(tbl.x); +# +# The implicit constraint "tbl.x = vtab.hidden" is not optimized using +# an index on tbl.x. +# +reset_db +register_tcl_module db +proc vtab_command {method args} { + switch -- $method { + xConnect { + return "CREATE TABLE t1(a, b, c, d HIDDEN)" + } + + xBestIndex { + set hdl [lindex $args 0] + set clist [$hdl constraints] + set orderby [$hdl orderby] + set mask [$hdl mask] + + if {[llength $clist]!=1} { error "unexpected constraint list" } + catch { array unset C } + array set C [lindex $clist 0] + if {$C(usable)} { + return [list omit 0 idxnum 555 rows 10 cost 100] + } + return [list cost 100000000] + } + + } + + return {} +} + +do_execsql_test 2.0 { + CREATE VIRTUAL TABLE x1 USING tcl(vtab_command); + CREATE TABLE t1 (x INT PRIMARY KEY); +} {} + +do_eqp_test 2.1 { + SELECT * FROM t1, x1 WHERE x1.d=t1.x; +} { + QUERY PLAN + |--SCAN x1 VIRTUAL TABLE INDEX 0: + `--SEARCH t1 USING COVERING INDEX sqlite_autoindex_t1_1 (x=?) +} + +do_eqp_test 2.2 { + SELECT * FROM t1, x1(t1.x) +} { + QUERY PLAN + |--SCAN t1 + `--SCAN x1 VIRTUAL TABLE INDEX 555: +} + + +finish_test |