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Posted to issues@spark.apache.org by "Yuming Wang (Jira)" <ji...@apache.org> on 2020/05/13 14:20:00 UTC
[jira] [Created] (SPARK-31705) Rewrite join condition to
conjunctive normal form
Yuming Wang created SPARK-31705:
-----------------------------------
Summary: Rewrite join condition to conjunctive normal form
Key: SPARK-31705
URL: https://issues.apache.org/jira/browse/SPARK-31705
Project: Spark
Issue Type: New Feature
Components: SQL
Affects Versions: 3.1.0
Reporter: Yuming Wang
Assignee: Yuming Wang
Rewrite join condition to [conjunctive normal form|https://en.wikipedia.org/wiki/Conjunctive_normal_form] to push more conditions to filter.
PostgreSQL:
{code:sql}
CREATE TABLE lineitem (l_orderkey BIGINT, l_partkey BIGINT, l_suppkey BIGINT,
l_linenumber INT, l_quantity DECIMAL(10,0), l_extendedprice DECIMAL(10,0),
l_discount DECIMAL(10,0), l_tax DECIMAL(10,0), l_returnflag varchar(255),
l_linestatus varchar(255), l_shipdate DATE, l_commitdate DATE, l_receiptdate DATE,
l_shipinstruct varchar(255), l_shipmode varchar(255), l_comment varchar(255));
CREATE TABLE orders (
o_orderkey BIGINT, o_custkey BIGINT, o_orderstatus varchar(255),
o_totalprice DECIMAL(10,0), o_orderdate DATE, o_orderpriority varchar(255),
o_clerk varchar(255), o_shippriority INT, o_comment varchar(255));
explain select count(*) from lineitem, orders
where l_orderkey = o_orderkey
and ((l_suppkey > 10 and o_custkey > 20)
or (l_suppkey > 30 and o_custkey > 40))
and l_partkey > 0;
explain select count(*) from lineitem join orders
on l_orderkey = o_orderkey
and ((l_suppkey > 10 and o_custkey > 20)
or (l_suppkey > 30 and o_custkey > 40))
and l_partkey > 0;
{code}
{noformat}
postgres=# explain select count(*) from lineitem, orders
postgres-# where l_orderkey = o_orderkey
postgres-# and ((l_suppkey > 10 and o_custkey > 20)
postgres(# or (l_suppkey > 30 and o_custkey > 40))
postgres-# and l_partkey > 0;
QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------------------
Aggregate (cost=21.18..21.19 rows=1 width=8)
-> Hash Join (cost=10.60..21.17 rows=2 width=0)
Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
Join Filter: (((lineitem.l_suppkey > 10) AND (orders.o_custkey > 20)) OR ((lineitem.l_suppkey > 30) AND (orders.o_custkey > 40)))
-> Seq Scan on orders (cost=0.00..10.45 rows=17 width=16)
Filter: ((o_custkey > 20) OR (o_custkey > 40))
-> Hash (cost=10.53..10.53 rows=6 width=16)
-> Seq Scan on lineitem (cost=0.00..10.53 rows=6 width=16)
Filter: ((l_partkey > 0) AND ((l_suppkey > 10) OR (l_suppkey > 30)))
(9 rows)
postgres=#
postgres=# explain select count(*) from lineitem join orders
postgres-# on l_orderkey = o_orderkey
postgres-# and ((l_suppkey > 10 and o_custkey > 20)
postgres(# or (l_suppkey > 30 and o_custkey > 40))
postgres-# and l_partkey > 0;
QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------------------
Aggregate (cost=21.18..21.19 rows=1 width=8)
-> Hash Join (cost=10.60..21.17 rows=2 width=0)
Hash Cond: (orders.o_orderkey = lineitem.l_orderkey)
Join Filter: (((lineitem.l_suppkey > 10) AND (orders.o_custkey > 20)) OR ((lineitem.l_suppkey > 30) AND (orders.o_custkey > 40)))
-> Seq Scan on orders (cost=0.00..10.45 rows=17 width=16)
Filter: ((o_custkey > 20) OR (o_custkey > 40))
-> Hash (cost=10.53..10.53 rows=6 width=16)
-> Seq Scan on lineitem (cost=0.00..10.53 rows=6 width=16)
Filter: ((l_partkey > 0) AND ((l_suppkey > 10) OR (l_suppkey > 30)))
(9 rows)
{noformat}
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