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[SPARK-31790][DOCS] cast(long as timestamp) show different result between Hive and Spark #28605

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[SPARK-31790][DOCS] cast(long as timestamp) show different result between Hive and Spark #28605

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Merge pull request #1 from apache/master
GuoPhilipse May 20, 2020
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Merge pull request #2 from apache/master
GuoPhilipse May 22, 2020
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'modifydocs'
GuoPhilipse May 22, 2020
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1 change: 1 addition & 0 deletions docs/sql-migration-guide.md
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Expand Up @@ -961,3 +961,4 @@ Below are the scenarios in which Hive and Spark generate different results:
* `SQRT(n)` If n < 0, Hive returns null, Spark SQL returns NaN.
* `ACOS(n)` If n < -1 or n > 1, Hive returns null, Spark SQL returns NaN.
* `ASIN(n)` If n < -1 or n > 1, Hive returns null, Spark SQL returns NaN.
* `CAST(n as timestamp)` If n is Byte/Short/Int/Long data type, Hive treat n as milliseconds unit , while Spark SQL as seconds unit.
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@HyukjinKwon HyukjinKwon May 22, 2020

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Let's rephrase a bit more:

CAST(n AS TIMESTAMP) If n is integral numbers, Hive treats n as milliseconds, Spark SQL treats n as seconds .

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@GuoPhilipse GuoPhilipse May 22, 2020

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cool , have improved it.