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https://issues.apache.org/jira/browse/ASTERIXDB-1637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15478392#comment-15478392
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Yingyi Bu commented on ASTERIXDB-1637:
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After taking a look in the introduce join access method rule, I think the plan
is correct, because in the select operator, it has a retainMissing flag. That's
set to be true for the select operator:
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->$$29,
%0->$$30, AFloat: {0.6}], AInt64: {0}]]) -- |LOCAL|
It would be helpful to print that flag in the plan, e.g.:
select *[retainMissing=true]* (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->$$29, %0->$$30, AFloat: {0.6}], AInt64: {0}]]) -- |LOCAL|
> 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 two issues here:
> 1. The left_outer_unnest_maps in the plan should be unnest_map.
> 2. The join in the plan should be a left outer join instead of an inner join.
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