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Posted to issues@drill.apache.org by "Jacques Nadeau (JIRA)" <ji...@apache.org> on 2015/01/05 00:57:49 UTC
[jira] [Updated] (DRILL-1690) Issue with using HBase plugin to
access row_key only
[ https://issues.apache.org/jira/browse/DRILL-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jacques Nadeau updated DRILL-1690:
----------------------------------
Fix Version/s: 0.8.0
Assignee: Aditya Kishore
Priority: Critical (was: Major)
> Issue with using HBase plugin to access row_key only
> ----------------------------------------------------
>
> Key: DRILL-1690
> URL: https://issues.apache.org/jira/browse/DRILL-1690
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - HBase
> Reporter: Chun Chang
> Assignee: Aditya Kishore
> Priority: Critical
> Fix For: 0.8.0
>
>
> #Thu Nov 06 11:38:17 PST 2014
> git.commit.id.abbrev=eeb7160
> Configure an HBase plugin to access MapRDB table. When, select the row key only, we return two columns:
> 0: jdbc:drill:schema=M7> select row_key, fivecf from m7student limit 2;
> +------------+------------+
> | row_key | fivecf |
> +------------+------------+
> | [B@31966bd8 | {"create_date":"MjAxNC0wNS0yNyAwMDoyNjowNw=="} |
> | [B@a824b57 | {"create_date":"MjAxNC0wMy0yNCAyMTo1NzozMw=="} |
> +------------+------------+
> 2 rows selected (0.128 seconds)
> 0: jdbc:drill:schema=M7> select row_key from m7student limit 2;
> +------------+------------+
> | row_key | fivecf |
> +------------+------------+
> | [B@2560bab1 | {"create_date":"MjAxNC0wNS0yNyAwMDoyNjowNw=="} |
> | [B@7180cda2 | {"create_date":"MjAxNC0wMy0yNCAyMTo1NzozMw=="} |
> +------------+------------+
> 2 rows selected (0.107 seconds)
> Here is the plan:
> 0: jdbc:drill:schema=M7> explain plan for select row_key from m7student limit 2;
> +------------+------------+
> | text | json |
> +------------+------------+
> | 00-00 Screen
> 00-01 SelectionVectorRemover
> 00-02 Limit(fetch=[2])
> 00-03 Scan(groupscan=[HBaseGroupScan [HBaseScanSpec=HBaseScanSpec [tableName=m7student, startRow=null, stopRow=null, filter=null], columns=[SchemaPath [`row_key`]]]])
> | {
> "head" : {
> "version" : 1,
> "generator" : {
> "type" : "ExplainHandler",
> "info" : ""
> },
> "type" : "APACHE_DRILL_PHYSICAL",
> "options" : [ ],
> "queue" : 0,
> "resultMode" : "EXEC"
> },
> "graph" : [ {
> "pop" : "hbase-scan",
> "@id" : 3,
> "hbaseScanSpec" : {
> "tableName" : "m7student",
> "startRow" : "",
> "stopRow" : "",
> "serializedFilter" : null
> },
> "storage" : {
> "type" : "hbase",
> "config" : {
> "hbase.table.namespace.mappings" : "*:/test/tables"
> },
> "size.calculator.enabled" : false,
> "enabled" : true
> },
> "columns" : [ "`row_key`" ],
> "cost" : 1048576.0
> }, {
> "pop" : "limit",
> "@id" : 2,
> "child" : 3,
> "first" : 0,
> "last" : 2,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 1048576.0
> }, {
> "pop" : "selection-vector-remover",
> "@id" : 1,
> "child" : 2,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 1048576.0
> }, {
> "pop" : "screen",
> "@id" : 0,
> "child" : 1,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 1048576.0
> } ]
> } |
> +------------+------------+
> Drill should strip out the second column.
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