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Commit 09b3c56c authored by Sameer Agarwal's avatar Sameer Agarwal Committed by Reynold Xin
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[SPARK-14752][SQL] Explicitly implement KryoSerialization for LazilyGenerateOrdering 

## What changes were proposed in this pull request?

This patch fixes a number of `com.esotericsoftware.kryo.KryoException: java.lang.NullPointerException` exceptions reported in [SPARK-15604], [SPARK-14752] etc. (while executing sparkSQL queries with the kryo serializer) by explicitly implementing `KryoSerialization` for `LazilyGenerateOrdering`.

## How was this patch tested?

1. Modified `OrderingSuite` so that all tests in the suite also test kryo serialization (for both interpreted and generated ordering).
2. Manually verified TPC-DS q1.

Author: Sameer Agarwal <sameer@databricks.com>

Closes #13466 from sameeragarwal/kryo.
parent 7c07d176
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