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In the automatic index generator logic, be more precise about when a

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partial automatic index is allowed in order to capture more cases where it
is legal to use a partial automatic index.

FossilOrigin-Name: 664b461bb5063d98047fc2e51a3827235cd9f55ca2e23cb66e719eac53fb5437
This commit is contained in:
drh
2021-11-30 14:07:58 +00:00
parent 78679a4950
commit c1085ea412
4 changed files with 108 additions and 16 deletions
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93
test/autoindex4.test
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@@ -79,5 +79,98 @@ do_execsql_test autoindex4-3.1 {
ORDER BY Items.ItemName;
} {Item1 Item2}
# 2021-11-30 - Enhancement to help the automatic index mechanism to
# create a partial index more often.
#
unset -nocomplain id data1 data2 jointype onclause whereclause answer
foreach {id data1 data2 jointype onclause whereclause answer} {
1
VALUES(1,2),(3,4)
VALUES(1,2),(3,4)
{LEFT JOIN}
a=x
{y=4 OR y IS NULL}
{3 4 3 4}
2
VALUES(1,2),(3,4)
VALUES(1,2),(3,4)
{LEFT JOIN}
{a=x AND y=4}
{coalesce(y,4)==4}
{1 2 {} {} 3 4 3 4}
3
VALUES(1,2),(3,4)
VALUES(1,2),(3,4)
{JOIN}
{a=x}
{y=4 OR y IS NULL}
{3 4 3 4}
4
VALUES(1,2),(3,4)
VALUES(1,2),(3,4)
{JOIN}
{a=x AND y=4}
{coalesce(y,4)==4}
{3 4 3 4}
5
VALUES(1,2),(3,4),(NULL,4)
VALUES(1,2),(3,4)
{LEFT JOIN}
a=x
{y=4 OR y IS NULL}
{3 4 3 4 {} 4 {} {}}
6
VALUES(1,2),(3,4)
VALUES(1,2),(3,4),(NULL,4)
{LEFT JOIN}
{a=x AND y=4}
{coalesce(y,4)==4}
{1 2 {} {} 3 4 3 4}
7
VALUES(1,2),(3,4),(NULL,4)
VALUES(1,2),(3,4),(NULL,4)
{JOIN}
{a=x}
{y=4 OR y IS NULL}
{3 4 3 4}
8
VALUES(1,2),(3,4)
VALUES(1,2),(3,4)
{JOIN}
{a=x AND y=4}
{coalesce(y,4)==4}
{3 4 3 4}
} {
do_test autoindex4-4.$id.0 {
db eval {
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(a INT, b INT);
DROP TABLE IF EXISTS t2;
CREATE TABLE t2(x INT, y INT);
}
db eval "INSERT INTO t1(a,b) $data1;"
db eval "INSERT INTO t2(x,y) $data2;"
} {}
set sql "SELECT * FROM t1 $jointype t2 ON $onclause WHERE $whereclause"
# puts "sql = $sql"
do_test autoindex4-4.$id.1 {
db eval {PRAGMA automatic_index=ON;}
db eval $sql
} $answer
do_test autoindex4-4.$id.2 {
db eval {PRAGMA automatic_index=OFF;}
db eval $sql
} $answer
}
finish_test