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[SPARK-12758] [SQL] add note to Spark SQL Migration guide about TimestampType casting #10708

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[SPARK-12758] [SQL] add note to Spark SQL Migration guide about TimestampType casting #10708

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5 changes: 5 additions & 0 deletions docs/sql-programming-guide.md
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- From Spark 1.6, LongType casts to TimestampType expect seconds instead of microseconds. This
change was made to match the behavior of Hive 1.2 for more consistent type casting to TimestampType
from numeric types. See [SPARK-11724](https://issues.apache.org/jira/browse/SPARK-11724) for
details.

## Upgrading From Spark SQL 1.4 to 1.5

- Optimized execution using manually managed memory (Tungsten) is now enabled by default, along with
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