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Date: Fri, 23 Jan 2015 05:41:34 +0000 (UTC)
From: "Aditya Kishore (JIRA)" <jira@apache.org>
To: issues@drill.apache.org
Message-ID: <JIRA.12753578.1415322405000.153924.1421991694516@Atlassian.JIRA>
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 <JIRA.12753578.1415322405454@arcas>
Subject: [jira] [Updated] (DRILL-1651) Allow Filter to push past Project
 with ITEM operator
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     [ https://issues.apache.org/jira/browse/DRILL-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aditya Kishore updated DRILL-1651:
----------------------------------
    Component/s: Query Planning & Optimization

> 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: Jacques Nadeau
>             Fix For: 0.9.0
>
>
> #Tue Nov 04 16:58:08 UTC 2014
> git.commit.id.abbrev=129cb9c
> I noticed that the following query did not cause a pushdown:
> 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';
> plan:
> 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`]]]])
> But the following query did:
> 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';
> plan:
> 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 [`*`]]]])
> Select * caused triggered pushdown:
> 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 [`*`]]]])


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