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new 18b36ee [SPARK-27253][SQL][FOLLOW-UP] Add a note about parent-session
configuration priority in migration guide
18b36ee is described below
commit 18b36ee5ba7b7b7a88d641b5872c9d1aa87460e0
Author: HyukjinKwon <[email protected]>
AuthorDate: Mon Apr 8 09:14:40 2019 +0900
[SPARK-27253][SQL][FOLLOW-UP] Add a note about parent-session configuration
priority in migration guide
## What changes were proposed in this pull request?
This is a followup of https://github.com/apache/spark/pull/24189. It adds a
note about parent-session configuration priority.
## How was this patch tested?
Manually built the site and checked.
Closes #24279 from HyukjinKwon/SPARK-27253.
Lead-authored-by: HyukjinKwon <[email protected]>
Co-authored-by: Hyukjin Kwon <[email protected]>
Signed-off-by: HyukjinKwon <[email protected]>
---
docs/sql-migration-guide-upgrade.md | 2 ++
1 file changed, 2 insertions(+)
diff --git a/docs/sql-migration-guide-upgrade.md
b/docs/sql-migration-guide-upgrade.md
index fef8012..c3837f6 100644
--- a/docs/sql-migration-guide-upgrade.md
+++ b/docs/sql-migration-guide-upgrade.md
@@ -124,6 +124,8 @@ license: |
- Since Spark 3.0, `TIMESTAMP` literals are converted to strings using the
SQL config `spark.sql.session.timeZone`, and `DATE` literals are formatted
using the UTC time zone. In Spark version 2.4 and earlier, both conversions use
the default time zone of the Java virtual machine.
+ - In Spark version 2.4, when a spark session is created via
`cloneSession()`, the newly created spark session inherits its configuration
from its parent `SparkContext` even though the same configuration may exist
with a different value in its parent spark session. Since Spark 3.0, the
configurations of a parent `SparkSession` have a higher precedence over the
parent `SparkContext`.
+
## Upgrading From Spark SQL 2.3 to 2.4
- In Spark version 2.3 and earlier, the second parameter to array_contains
function is implicitly promoted to the element type of first array type
parameter. This type promotion can be lossy and may cause `array_contains`
function to return wrong result. This problem has been addressed in 2.4 by
employing a safer type promotion mechanism. This can cause some change in
behavior and are illustrated in the table below.
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