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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:
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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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