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Commit cbdcd4ed authored by Sameer Agarwal's avatar Sameer Agarwal Committed by Davies Liu
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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.
parent c752b6c5
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