Support distinctCountRawThetaSketch aggregation that returns serialized sketch. #5465
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…ed sketch. 1. Support a variation of theta sketch based distinct count aggregation function that returns serialized bytes of the final aggregated sketch, instead of the actual distinct value. 2. The return value is hex encoded String of the serialized sketch bytes. This can be deserialized at the client side by the library using org.apache.commons.codec.binary as: `Hex.decodeHex(stringValue.toCharArray())`. This is the same as any other byte[] value returned by Pinot. 3. Added unit test for the new aggregation function.
kishoreg
approved these changes
May 29, 2020
...c/main/java/org/apache/pinot/core/query/aggregation/function/AggregationFunctionFactory.java
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Support a variation of theta sketch based distinct count aggregation function that returns
serialized bytes of the final aggregated sketch, instead of the actual distinct value.
The return value is hex encoded String of the serialized sketch bytes. This can be
deserialized at the client side by the library using org.apache.commons.codec.binary as:
Hex.decodeHex(stringValue.toCharArray()). This is the same as any other byte[] valuereturned by Pinot.
Added unit test for the new aggregation function.