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[SPARK-14870] [SQL] Fix NPE in TPCDS q14a
## What changes were proposed in this pull request? This PR fixes a bug in `TungstenAggregate` that manifests while aggregating by keys over nullable `BigDecimal` columns. This causes a null pointer exception while executing TPCDS q14a. ## How was this patch tested? 1. Added regression test in `DataFrameAggregateSuite`. 2. Verified that TPCDS q14a works Author: Sameer Agarwal <sameer@databricks.com> Closes #12651 from sameeragarwal/tpcds-fix.
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