add parquet index #88
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Summary
Re-implement #28:
Adding the option to store the index table as Parquet of Avro btree. This is for batch-only use cases, where Avro index performance is inferior to Parquet especially when filtering or projecting columns.
In this implementation the index type (avrobtree/parquet) is stored in the index table props, and fetch throws UnsupportedException when the underlying index format is Parquet
How was it tested?
TestAvroIndexManagerchanged to abstract, with two implementations: (1) with the regular Avro btree index, and (2) with parquet index