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[SPARK-29364][SQL] Return an interval from date subtract according to SQL standard #26112

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[SPARK-29364][SQL] Return an interval from date subtract according to SQL standard #26112

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18bc09b
Add SubtractDates
MaxGekk Oct 14, 2019
141d3da
Add tests for SubtractDates
MaxGekk Oct 14, 2019
dc37bc7
Use SubtractDates for dates subtract
MaxGekk Oct 14, 2019
e82f027
Update the SQL migration guide
MaxGekk Oct 14, 2019
e74f81b
Regen date.sql.out
MaxGekk Oct 14, 2019
4a8173b
Regen datetime.sql.out
MaxGekk Oct 14, 2019
27de6b8
Add config spark.sql.legacy.datesSubtraction.enabled
MaxGekk Oct 14, 2019
fbd2723
TimestampDiff -> SubtractTimestamps
MaxGekk Oct 14, 2019
199adff
Update config description regarding datediff
MaxGekk Oct 14, 2019
8b49c9b
Regen datetime.sql.out
MaxGekk Oct 15, 2019
85f17f7
Revert "Update config description regarding datediff"
MaxGekk Oct 15, 2019
228673d
Revert "Add config spark.sql.legacy.datesSubtraction.enabled"
MaxGekk Oct 15, 2019
f232b64
Revert "Update the SQL migration guide"
MaxGekk Oct 15, 2019
c6ec211
Use DateDiff in the PostgreSQL dialect
MaxGekk Oct 16, 2019
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Revert "Update the SQL migration guide" 
This reverts commit e82f027.
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@MaxGekk
MaxGekk committed Oct 15, 2019
commit f232b64eada7a9dbd6d859e2957ef5ed037051d7
2 changes: 0 additions & 2 deletions docs/sql-migration-guide.md
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Expand Up @@ -217,8 +217,6 @@ license: |

- Since Spark 3.0, the `size` function returns `NULL` for the `NULL` input. In Spark version 2.4 and earlier, this function gives `-1` for the same input. To restore the behavior before Spark 3.0, you can set `spark.sql.legacy.sizeOfNull` to `true`.

- In Spark version 2.4 and earlier, dates subtraction `date1` - `date2` gives the number of days from `date1` to `date2`. Since Spark 3.0, the expression has the `INTERVAL` type and returns an interval between two dates. To get the number of days, use the `datediff` function.

## Upgrading from Spark SQL 2.4 to 2.4.1

- The value of `spark.executor.heartbeatInterval`, when specified without units like "30" rather than "30s", was
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