Mahesh Raju Somalaraju created CARBONDATA-3724:
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Summary: Secondary Index enable on partition Table
Key: CARBONDATA-3724
URL: https://issues.apache.org/jira/browse/CARBONDATA-3724
Project: CarbonData
Issue Type: New Feature
Reporter: Mahesh Raju Somalaraju
What is Secondary Index table ?
Currently we have datamaps like, *default datamaps* which are block and
blocklet and *coarse grained datamaps* like bloom, and *fine grained datamaps*
like lucene
which helps in better pruning during query. What if we introduce another kind
of datamap which can hold blockletId as index? Initial level, we call it as
index which
will work as a child table to the main table like we have MV in our current
code.
The secondary index to carbon table which will be the child table to main table
and it can be created on column like we create lucene datamap,
where we give index columns to create index. In a similar way, we create
secondary index on column, so indexes on these column will be blocklet IDs
which will
help in better pruning and faster query when we have a filter query on the
index column.
Existing behaviour:
Secondary index is not supported for partition table.
New behaviour:
Secondary index supports on non partition columns instead of blocking full
partition table.
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