database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-07-27 20:41:58 +03:00
Code Activity

Experimental enhancement in which expressions of the form "expr IN table"

Browse Source 
can be pushed down into subexpressions.

FossilOrigin-Name: 2cbd7838fd6ffdf210f34671cd2e3e749a076a3a6f155bbe5f910a67db31c5b1
This commit is contained in:
drh
2024-04-05 20:01:28 +00:00
parent b411c4d69e
commit 743ae4c68b
6 changed files with 157 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
test/pushdown.test
View File

@ -227,4 +227,89 @@ do_execsql_test 5.0 {
WHERE e>0;
} {- - 3 4 5}
# 2024-04-05
# Allow push-down of operators of the form "expr IN table".
#
reset_db
do_execsql_test 6.0 {
CREATE TABLE t01(w,x,y,z);
CREATE TABLE t02(w,x,y,z);
CREATE VIEW t0(w,x,y,z) AS
SELECT w,x,y,z FROM t01 UNION ALL SELECT w,x,y,z FROM t02;
CREATE INDEX t01x ON t01(w,x,y);
CREATE INDEX t02x ON t02(w,x,y);
CREATE VIEW v1(k) AS VALUES(77),(88),(99);
CREATE TABLE k1(k);
INSERT INTO k1 SELECT * FROM v1;
}
do_eqp_test 6.1 {
WITH k(n) AS (VALUES(77),(88),(99))
SELECT max(z) FROM t0 WHERE w=123 AND x IN k AND y BETWEEN 44 AND 55;
} {
QUERY PLAN
|--CO-ROUTINE t0
| `--COMPOUND QUERY
| |--LEFT-MOST SUBQUERY
| | |--SEARCH t01 USING INDEX t01x (w=? AND x=? AND y>? AND y<?)
| | `--LIST SUBQUERY xxxxxx
| | |--MATERIALIZE k
| | | `--SCAN 3 CONSTANT ROWS
| | `--SCAN k
| `--UNION ALL
| |--SEARCH t02 USING INDEX t02x (w=? AND x=? AND y>? AND y<?)
| `--LIST SUBQUERY xxxxxx
| `--SCAN k
|--SEARCH t0
`--LIST SUBQUERY xxxxxx
`--SCAN k
}
# ^^^^--- The key feature above is that the SEARCH for each subquery
# uses all three fields of the index w, x, and y. Prior to the push-down
# of "expr IN table", only the w term of the index would be used. Similar
# for the following tests:
#
do_eqp_test 6.2 {
SELECT max(z) FROM t0 WHERE w=123 AND x IN v1 AND y BETWEEN 44 AND 55;
} {
QUERY PLAN
|--CO-ROUTINE t0
| `--COMPOUND QUERY
| |--LEFT-MOST SUBQUERY
| | |--SEARCH t01 USING INDEX t01x (w=? AND x=? AND y>? AND y<?)
| | `--LIST SUBQUERY xxxxxx
| | |--CO-ROUTINE v1
| | | `--SCAN 3 CONSTANT ROWS
| | `--SCAN v1
| `--UNION ALL
| |--SEARCH t02 USING INDEX t02x (w=? AND x=? AND y>? AND y<?)
| `--LIST SUBQUERY xxxxxx
| |--CO-ROUTINE v1
| | `--SCAN 3 CONSTANT ROWS
| `--SCAN v1
|--SEARCH t0
`--LIST SUBQUERY xxxxxx
|--CO-ROUTINE v1
| `--SCAN 3 CONSTANT ROWS
`--SCAN v1
}
do_eqp_test 6.3 {
SELECT max(z) FROM t0 WHERE w=123 AND x IN k1 AND y BETWEEN 44 AND 55;
} {
QUERY PLAN
|--CO-ROUTINE t0
| `--COMPOUND QUERY
| |--LEFT-MOST SUBQUERY
| | |--SEARCH t01 USING INDEX t01x (w=? AND x=? AND y>? AND y<?)
| | `--LIST SUBQUERY xxxxxx
| | `--SCAN k1
| `--UNION ALL
| |--SEARCH t02 USING INDEX t02x (w=? AND x=? AND y>? AND y<?)
| `--LIST SUBQUERY xxxxxx
| `--SCAN k1
|--SEARCH t0
`--LIST SUBQUERY xxxxxx
`--SCAN k1
}
finish_test