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https://issues.apache.org/jira/browse/CARBONDATA-2278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ravindra Pesala reassigned CARBONDATA-2278:
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Assignee: Ravindra Pesala
> Save the datamaps to system folder of warehouse
> -----------------------------------------------
>
> Key: CARBONDATA-2278
> URL: https://issues.apache.org/jira/browse/CARBONDATA-2278
> Project: CarbonData
> Issue Type: New Feature
> Reporter: Ravindra Pesala
> Assignee: Ravindra Pesala
> Priority: Major
>
> *Problem*
> Currently, datamap schema is saved inside the main table schema itself. This
> approach cannot satisfy if a datamap belongs to more than one table. For
> suppose if we need to create a datamap joining 2 tables then we cannot keep
> the datamap schema under any one table.
> And also accessing the datamaps required to read the main table schema every
> time, it is not well optimized. And if we need to create multiple datamaps
> for a table then all datamaps need to store under the schema of that table so
> the size of main table schema grows and impacts the performance.
> *Solution*
> Make the datamap schema independent of main table schema. And store the
> schema under {{_system}}folder location. This location is configurable by
> using carbon property {{carbon.system.folder.location}} , by default, it
> stores under the store location.
> Created datamap schema in JSON format for better readability. And has the
> interfaces to store it in database.
> Made {{on table <tablename>}} for datamap DDL as optional , so now user can
> create/drop or show datamaps without {{on table}} option.
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