Yingyi Bu created ASTERIXDB-1637:
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Summary: Incorrect plan generated by left outer index join
rewriting
Key: ASTERIXDB-1637
URL: https://issues.apache.org/jira/browse/ASTERIXDB-1637
Project: Apache AsterixDB
Issue Type: Bug
Components: Optimizer
Reporter: Yingyi Bu
Assignee: Taewoo Kim
For optimizer test
asterixdb/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/issue741.aql,
the optimized plan is not right.
{noformat}
for $t in dataset('TweetMessages')
where $t.send_time >= datetime('2011-06-18T14:10:17')
and
$t.send_time < datetime('2011-06-18T15:10:17')
return {
"tweet": $t.tweetid,
"similar-tweets": for $t2 in dataset('TweetMessages')
let $sim := similarity-jaccard-check($t.referred_topics,
$t2.referred_topics, 0.6f)
where $sim[0] and
$t2.tweetid != $t.tweetid
return $t2.tweetid
}
{noformat}
{noformat}
distribute result [%0->$$11]
-- DISTRIBUTE_RESULT |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
project ([$$11])
-- STREAM_PROJECT |PARTITIONED|
assign [$$11] <- [function-call: asterix:closed-record-constructor,
Args:[AString: {tweet}, %0->$$33, AString: {similar-tweets}, %0->$$23]]
-- ASSIGN |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
group by ([$$33 := %0->$$25]) decor ([]) {
aggregate [$$23] <- [function-call: asterix:listify,
Args:[%0->$$26]]
-- AGGREGATE |LOCAL|
select (function-call: algebricks:not,
Args:[function-call: algebricks:is-missing, Args:[%0->$$26]])
-- STREAM_SELECT |LOCAL|
nested tuple source
-- NESTED_TUPLE_SOURCE |LOCAL|
}
-- PRE_CLUSTERED_GROUP_BY[$$25] |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
order (ASC, %0->$$25)
-- STABLE_SORT [$$25(ASC)] |PARTITIONED|
exchange
-- HASH_PARTITION_EXCHANGE [$$25] |PARTITIONED|
project ([$$25, $$26])
-- STREAM_PROJECT |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
join (function-call: algebricks:eq, Args:[%0->$$36,
%0->$$25])
-- HYBRID_HASH_JOIN [$$36][$$25] |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
project ([$$36])
-- STREAM_PROJECT |PARTITIONED|
select (function-call: algebricks:and,
Args:[function-call: algebricks:ge, Args:[%0->$$24, ADateTime: {
2011-06-18T14:10:17.000Z }], function-call: algebricks:lt, Args:[%0->$$24,
ADateTime: { 2011-06-18T15:10:17.000Z }]])
-- STREAM_SELECT |PARTITIONED|
project ([$$36, $$24])
-- STREAM_PROJECT |PARTITIONED|
assign [$$24] <- [function-call:
asterix:field-access-by-index, Args:[%0->$$0, AInt32: {3}]]
-- ASSIGN |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
data-scan []<-[$$36, $$0] <-
test:TweetMessages
-- DATASOURCE_SCAN |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
empty-tuple-source
-- EMPTY_TUPLE_SOURCE |PARTITIONED|
exchange
-- HASH_PARTITION_EXCHANGE [$$25] |PARTITIONED|
project ([$$25, $$26])
-- STREAM_PROJECT |PARTITIONED|
select (function-call: algebricks:and,
Args:[function-call: algebricks:neq, Args:[%0->$$26, %0->$$25], function-call:
asterix:get-item, Args:[function-call: asterix:similarity-jaccard-check,
Args:[%0->$$29, function-call: asterix:field-access-by-index, Args:[%0->$$1,
AInt32: {4}], AFloat: {0.6}], AInt64: {0}]])
-- STREAM_SELECT |PARTITIONED|
project ([$$1, $$25, $$26, $$29])
-- STREAM_PROJECT |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
left-outer-unnest-map [$$26, $$1] <-
function-call: asterix:index-search, Args:[AString: {TweetMessages}, AInt32:
{0}, AString: {test}, AString: {TweetMessages}, ABoolean: {true}, ABoolean:
{false}, AInt32: {1}, %0->$$39, AInt32: {1}, %0->$$39, TRUE, TRUE, TRUE]
-- BTREE_SEARCH |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
order (ASC, %0->$$39)
-- STABLE_SORT [$$39(ASC)] |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE |PARTITIONED|
left-outer-unnest-map [$$39] <-
function-call: asterix:index-search, Args:[AString: {topicIIx}, AInt32: {4},
AString: {test}, AString: {TweetMessages}, ABoolean: {true}, ABoolean: {true},
AInt32: {1}, AFloat: {0.6}, AInt32: {22}, AInt32: {1}, %0->$$29]
--
LENGTH_PARTITIONED_INVERTED_INDEX_SEARCH |PARTITIONED|
exchange
-- BROADCAST_EXCHANGE |PARTITIONED|
project ([$$25, $$29])
-- STREAM_PROJECT |PARTITIONED|
select (function-call:
algebricks:and, Args:[function-call: algebricks:ge, Args:[%0->$$37, ADateTime:
{ 2011-06-18T14:10:17.000Z }], function-call: algebricks:lt, Args:[%0->$$37,
ADateTime: { 2011-06-18T15:10:17.000Z }]])
-- STREAM_SELECT |PARTITIONED|
project ([$$37, $$25, $$29])
-- STREAM_PROJECT
|PARTITIONED|
assign [$$29, $$37] <-
[function-call: asterix:field-access-by-index, Args:[%0->$$38, AInt32: {4}],
function-call: asterix:field-access-by-index, Args:[%0->$$38, AInt32: {3}]]
-- ASSIGN |PARTITIONED|
exchange
-- ONE_TO_ONE_EXCHANGE
|PARTITIONED|
data-scan []<-[$$25,
$$38] <- test:TweetMessages
-- DATASOURCE_SCAN
|PARTITIONED|
exchange
--
ONE_TO_ONE_EXCHANGE |PARTITIONED|
empty-tuple-source
--
EMPTY_TUPLE_SOURCE |PARTITIONED|
{noformat}
There are several issues here:
1. The filtering condition on $t.send_time gets pushed to a wrong input branch.
It should be on the outer branch, rather than the inner branch.
2. The left_outer_unnest_maps in the plan should be unnest_map.
3. The join in the plan should be a left outer join instead of an inner join.
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