[
https://issues.apache.org/jira/browse/DRILL-1672?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jacques Nadeau resolved DRILL-1672.
-----------------------------------
Resolution: Fixed
> hbase string comparison handled wrong
> -------------------------------------
>
> Key: DRILL-1672
> URL: https://issues.apache.org/jira/browse/DRILL-1672
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - HBase
> Affects Versions: 0.7.0
> Reporter: Chun Chang
> Priority: Blocker
>
> #Tue Nov 04 16:58:08 UTC 2014
> git.commit.id.abbrev=129cb9c
> String is not compared properly:
> 0: jdbc:drill:schema=hbase> select cast(s.row_key as varchar(20)),
> cast(s.onecf.name as varchar(30)) name from student s where s.row_key = '10';
> +------------+------------+
> | EXPR$0 | name |
> +------------+------------+
> | 10 | victor nixon |
> | 100 | bob van buren |
> | 1000 | ulysses young |
> | 101 | nick carson |
> | 102 | ethan ovid |
> | 103 | katie thompson |
> | 104 | luke polk |
> | 105 | ulysses davidson |
> | 106 | bob ovid |
> | 107 | katie robinson |
> | 108 | sarah laertes |
> | 109 | priscilla xylophone |
> +------------+------------+
> Here is the plan:
> 0: jdbc:drill:schema=hbase> explain plan for select cast(s.row_key as
> varchar(20)), cast(s.onecf.name as varchar(30)) name from student s where
> s.row_key = '10';
> +------------+------------+
> | text | json |
> +------------+------------+
> | 00-00 Screen
> 00-01 Project(EXPR$0=[CAST($0):VARCHAR(20) CHARACTER SET "ISO-8859-1"
> COLLATE "ISO-8859-1$en_US$primary" NOT NULL], name=[CAST($1):VARCHAR(30)
> CHARACTER SET "ISO-8859-1" COLLATE "ISO-8859-1$en_US$primary"])
> 00-02 SelectionVectorRemover
> 00-03 Filter(condition=[=(CAST($0):CHAR(2) CHARACTER SET
> "ISO-8859-1" COLLATE "ISO-8859-1$en_US$primary" NOT NULL, '10')])
> 00-04 Project(row_key=[$0], ITEM=[ITEM($1, 'name')])
> 00-05 Scan(groupscan=[HBaseGroupScan
> [HBaseScanSpec=HBaseScanSpec [tableName=student, startRow=null, stopRow=null,
> filter=null], columns=[SchemaPath [`row_key`], SchemaPath [`onecf`.`name`]]]])
> | {
> "head" : {
> "version" : 1,
> "generator" : {
> "type" : "ExplainHandler",
> "info" : ""
> },
> "type" : "APACHE_DRILL_PHYSICAL",
> "options" : [ ],
> "queue" : 0,
> "resultMode" : "EXEC"
> },
> "graph" : [ {
> "pop" : "hbase-scan",
> "@id" : 5,
> "hbaseScanSpec" : {
> "tableName" : "student",
> "startRow" : "",
> "stopRow" : "",
> "serializedFilter" : null
> },
> "storage" : {
> "type" : "hbase",
> "config" : {
> "hbase.zookeeper.quorum" :
> "10.10.100.113,10.10.100.114,10.10.100.115",
> "hbase.zookeeper.property.clientPort" : "5181"
> },
> "size.calculator.enabled" : false,
> "enabled" : true
> },
> "columns" : [ "`row_key`", "`onecf`.`name`" ],
> "cost" : 1048576.0
> }, {
> "pop" : "project",
> "@id" : 4,
> "exprs" : [ {
> "ref" : "`row_key`",
> "expr" : "`row_key`"
> }, {
> "ref" : "`ITEM`",
> "expr" : "`onecf`.`name`"
> } ],
> "child" : 5,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 1048576.0
> }, {
> "pop" : "filter",
> "@id" : 3,
> "child" : 4,
> "expr" : "equal(cast( (`row_key` ) as VARCHAR(2) ), '10') ",
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 157286.4
> }, {
> "pop" : "selection-vector-remover",
> "@id" : 2,
> "child" : 3,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 157286.4
> }, {
> "pop" : "project",
> "@id" : 1,
> "exprs" : [ {
> "ref" : "`EXPR$0`",
> "expr" : "cast( (`row_key` ) as VARCHAR(20) )"
> }, {
> "ref" : "`name`",
> "expr" : "cast( (`ITEM` ) as VARCHAR(30) )"
> } ],
> "child" : 2,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 157286.4
> }, {
> "pop" : "screen",
> "@id" : 0,
> "child" : 1,
> "initialAllocation" : 1000000,
> "maxAllocation" : 10000000000,
> "cost" : 157286.4
> } ]
> } |
> +------------+------------+
> The filter item is casted as char(2):
> Filter(condition=[=(CAST($0):CHAR(2)
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