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https://issues.apache.org/jira/browse/HADOOP-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Edward Yoon updated HADOOP-2003:
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Description:
selects a subset of the rows in a relation that satisfy a selection condition
(yet, by only iterator series-based process)
Result = σ ~selection_condition~ (Relation)
a boolean expression specified on the attributes of a specified relation
a relation that has the same attributes as the source relation;
* stands for the usual comparison operators '<', '<>', '<=', '>', '>=', etc
* clauses can be arbitrarily connected with boolean operators AND, OR, NOT
was:
selects a subset of the rows in a relation that satisfy a selection condition
(yet, by only iterator series-based process)
Result = σ (selection condition)(relation name)
a boolean expression specified on the attributes of a specified relation
a relation that has the same attributes as the source relation;
* stands for the usual comparison operators '<', '<>', '<=', '>', '>=', etc
* clauses can be arbitrarily connected with boolean operators AND, OR, NOT
> The boolean expression can be added to the where clause of select statement
> ---------------------------------------------------------------------------
>
> Key: HADOOP-2003
> URL: https://issues.apache.org/jira/browse/HADOOP-2003
> Project: Hadoop
> Issue Type: Sub-task
> Components: contrib/hbase
> Affects Versions: 0.14.1
> Environment: All Environments
> Reporter: Edward Yoon
> Priority: Minor
> Fix For: 0.16.0
>
>
> selects a subset of the rows in a relation that satisfy a selection condition
> (yet, by only iterator series-based process)
> Result = σ ~selection_condition~ (Relation)
> a boolean expression specified on the attributes of a specified relation
> a relation that has the same attributes as the source relation;
> * stands for the usual comparison operators '<', '<>', '<=', '>', '>=', etc
> * clauses can be arbitrarily connected with boolean operators AND, OR, NOT
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