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https://issues.apache.org/jira/browse/DRILL-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14635723#comment-14635723
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ASF GitHub Bot commented on DRILL-1651:
---------------------------------------
GitHub user jinfengni opened a pull request:
https://github.com/apache/drill/pull/96
DRILL-1651: Push filter past project with ITEM operator into HBase scan.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinfengni/incubator-drill DRILL-1651
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/96.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #96
----
commit 66a30f12bfa033200e5ac9ca5c05c1c5a31c720b
Author: Jinfeng Ni <j...@apache.org>
Date: 2015-07-17T21:53:13Z
DRILL-1651: Push filter past project with ITEM operator into HBase scan.
----
> Allow Filter to push past Project with ITEM operator
> ----------------------------------------------------
>
> Key: DRILL-1651
> URL: https://issues.apache.org/jira/browse/DRILL-1651
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization, Storage - HBase
> Affects Versions: 0.7.0
> Reporter: Chun Chang
> Assignee: Jinfeng Ni
> Fix For: 1.2.0
>
>
> #Tue Nov 04 16:58:08 UTC 2014
> git.commit.id.abbrev=129cb9c
> I noticed that the following query did not cause a pushdown:
> {code}
> select cast(row_key as integer) student_id, (cast(twocf['age'] as
> integer)/cast(threecf['gpa'] as float)) from student where row_key < '800'
> and row_key > '750';
> {code}
> plan:
> {code}
> 00-01 Project(student_id=[CAST($0):INTEGER NOT NULL],
> EXPR$1=[/(CAST($1):INTEGER, CAST($2):FLOAT)])
> 00-02 SelectionVectorRemover
> 00-03 Filter(condition=[AND(<($0, '800'), >($0, '750'))])
> 00-04 Project(row_key=[$1], ITEM=[ITEM($2, 'age')],
> ITEM2=[ITEM($0, 'gpa')])
> 00-05 Scan(groupscan=[HBaseGroupScan
> [HBaseScanSpec=HBaseScanSpec [tableName=student, startRow=null, stopRow=null,
> filter=null], columns=[SchemaPath [`row_key`], SchemaPath [`twocf`.`age`],
> SchemaPath [`threecf`.`gpa`]]]])
> {code}
> But the following query did:
> {code}
> select cast(row_key as integer) student_id, cast(onecf['name'] as
> varchar(30)) name, cast(twocf['age'] as integer) age, cast(threecf['gpa'] as
> decimal(4,2)) gpa, cast(fourcf['studentnum'] as bigint) student_num,
> cast(fivecf['create_date'] as timestamp) create_date from student where
> row_key > '750' and row_key < '800';
> {code}
> plan:
> {code}
> 00-01 Project(student_id=[CAST($0):INTEGER NOT NULL],
> name=[CAST(ITEM($3, 'name')):VARCHAR(30) CHARACTER SET "ISO-8859-1" COLLATE
> "ISO-8859-1$en_US$primary"], age=[CAST(ITEM($5, 'age')):INTEGER],
> gpa=[CAST(ITEM($4, 'gpa')):DECIMAL(4, 2)], student_num=[CAST(ITEM($2,
> 'studentnum')):BIGINT], create_date=[CAST(ITEM($1,
> 'create_date')):TIMESTAMP(0)])
> 00-02 Scan(groupscan=[HBaseGroupScan [HBaseScanSpec=HBaseScanSpec
> [tableName=student, startRow=750\x00, stopRow=800, filter=FilterList AND
> (2/2): [RowFilter (GREATER, 750), RowFilter (LESS, 800)]],
> columns=[SchemaPath [`*`]]]])
> {code}
> Select * caused triggered pushdown:
> {code}
> 0: jdbc:drill:schema=hbase> explain plan for select * from student where
> row_key < '800' and row_key > '750';
> +------------+------------+
> | text | json |
> +------------+------------+
> | 00-00 Screen
> 00-01 Project(row_key=[$0], fivecf=[$1], fourcf=[$2], onecf=[$3],
> threecf=[$4], twocf=[$5])
> 00-02 Scan(groupscan=[HBaseGroupScan [HBaseScanSpec=HBaseScanSpec
> [tableName=student, startRow=750\x00, stopRow=800, filter=FilterList AND
> (2/2): [RowFilter (LESS, 800), RowFilter (GREATER, 750)]],
> columns=[SchemaPath [`*`]]]])
> {code}
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