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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14997) Move compareOp and Comparators out of filter to client package
Date Wed, 06 Sep 2017 20:53:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16156024#comment-16156024
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stack commented on HBASE-14997:
-------------------------------

DynamoDB has notion of a Condition and ComparisonOperator.

http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Condition.html

http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/dynamodbv2/model/ComparisonOperator.html

You stipulate KeyCondition like this (in JSON) as part of a Query....

This late in the game, let me just fix the CompareOp reveal in API. Condition would be nice...
say a CellCondition... but would have to teach users new means of using API.

> Move compareOp and Comparators out of filter to client package
> --------------------------------------------------------------
>
>                 Key: HBASE-14997
>                 URL: https://issues.apache.org/jira/browse/HBASE-14997
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Enis Soztutar
>            Priority: Critical
>             Fix For: 2.0.0-alpha-3
>
>
> {{Table.checkAndPut()}} and its cousins depend on CompareOp from the filter package.
Originally, ComparaOp and ByteArrayComparable, and various "comparators" have been used in
filters, so these are in the filter package. However, for checkAndPut(), etc we depend on
the filter subpackage although these are not filter related operations. We can use some clean
up.
> {code}
>   boolean checkAndPut(byte[] row, byte[] family, byte[] qualifier,
>     CompareFilter.CompareOp compareOp, byte[] value, Put put) throws IOException;
> {code}
> Some ideas
>  - Cleanup ByteArrayComparable interface (see the TODO at the class) 
>  - Maybe introduce a {{Condition}} or a similar concept and do {{checkAndPut(Condition
condition, Put put)}} and change filters to use that as well. 
>  - Introducing Condition like thing will allow us to have an interface like: {{checkAndMutate(List<Condition>
conditions, List<Mutation> mutations)}}. 
>  - BinaryComparator, etc are not "Comparators", they are comparables. 



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