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https://issues.apache.org/jira/browse/DRILL-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chun Chang updated DRILL-1651:
------------------------------
Component/s: (was: Query Planning & Optimization)
Storage - HBase
> hbase pushdown not working for some query
> -----------------------------------------
>
> Key: DRILL-1651
> URL: https://issues.apache.org/jira/browse/DRILL-1651
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - HBase
> Affects Versions: 0.7.0
> Reporter: Chun Chang
>
> #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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