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optimize
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@xubo245
xubo245 committed Jan 14, 2019
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### Introduction
DataMap is a data structure that can be used to accelerate certain query of the table. Different DataMap can be implemented by developers.
Currently, there are two types of DataMap supported:
1. IndexDataMap: DataMap that leverages index to accelerate filter query. Lucene DataMap and BloomFiler DataMap belongs to this type of DataMaps.
2. MVDataMap: DataMap that leverages Materialized View to accelerate olap style query, like SPJG query (select, predicate, join, groupby). Preaggregate, timeseries and mv DataMap belongs to this type of DataMaps.
1. IndexDataMap: DataMap that leverages index to accelerate filter query. Lucene DataMap and BloomFiler DataMap belong to this type of DataMaps.
2. MVDataMap: DataMap that leverages Materialized View to accelerate olap style query, like SPJG query (select, predicate, join, groupby). Preaggregate, timeseries and mv DataMap belong to this type of DataMaps.

### DataMap Provider
When user issues `CREATE DATAMAP dm ON TABLE main USING 'provider'`, the corresponding DataMapProvider implementation will be created and initialized.
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