Ravindra Pesala created CARBONDATA-2278:
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Summary: 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
*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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