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