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https://issues.apache.org/jira/browse/PHOENIX-5451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16923298#comment-16923298
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Hudson commented on PHOENIX-5451:
---------------------------------
SUCCESS: Integrated in Jenkins build Phoenix-4.x-HBase-1.5 #126 (See
[https://builds.apache.org/job/Phoenix-4.x-HBase-1.5/126/])
PHOENIX-5451 Column pruning for Subselect (chenglei: rev
5c269e6264e8b0f3f1411513abb109c1266395d9)
* (edit) phoenix-core/src/test/java/org/apache/phoenix/util/TestUtil.java
* (edit) phoenix-core/src/main/java/org/apache/phoenix/compile/FromCompiler.java
* (edit) phoenix-core/src/main/java/org/apache/phoenix/util/SchemaUtil.java
* (edit)
phoenix-core/src/test/java/org/apache/phoenix/compile/JoinQueryCompilerTest.java
* (edit) phoenix-core/src/main/java/org/apache/phoenix/compile/JoinCompiler.java
* (edit)
phoenix-core/src/main/java/org/apache/phoenix/parse/ParseNodeRewriter.java
* (edit)
phoenix-core/src/test/java/org/apache/phoenix/compile/QueryCompilerTest.java
* (add) phoenix-core/src/main/java/org/apache/phoenix/util/ParseNodeUtil.java
* (edit)
phoenix-core/src/main/java/org/apache/phoenix/compile/SubselectRewriter.java
* (edit)
phoenix-core/src/main/java/org/apache/phoenix/optimize/QueryOptimizer.java
> Column pruning for Subselect
> ----------------------------
>
> Key: PHOENIX-5451
> URL: https://issues.apache.org/jira/browse/PHOENIX-5451
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 4.14.2
> Reporter: chenglei
> Assignee: chenglei
> Priority: Major
> Fix For: 4.15.0, 5.1.0
>
> Attachments: PHOENIX-5451_v1-4.x-HBase-1.4.patch,
> PHOENIX-5451_v2-4.x-HBase-1.4.patch
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Phoenix has already could prune column for single flat table query, but for
> subselect in subquery or join, column pruning is not implemented.
> Consider following join sql :
> {code:java}
> select a.aid,b.bid from
> (select aid,age from table1 where age >=11 and age<=33 order by age limit 3)
> a inner join
> (select bid,code from table2 order by code limit 1) b on a.aid=b.bid
> {code}
> for LHS, {{table1.age}} is not referenced by outer join, and for RHS,
> {{table2.code}} is also not referenced by outer join, {{table1.age}} and
> {{table2.code}} could both be pruned when executing query for LHS and RHS,
> but now Phoenix does not prune them.
> Another example is subquery sql:
> {code:java}
> SELECT t.eid id, t.bstr b FROM
> (SELECT entity_id eid, a_string astr, b_string bstr FROM table WHERE a_byte
> + 1 < 9 limit 2) t ORDER BY b,id
> {code}
> for inner subselect sql, {{a_string}} is never used by outer sql, so
> {{a_string}} could be pruned when executing query for inner subselect, but
> now Phoenix does not prune it.
> Some existing test cases could be optimized by this patch.
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