dongjoon-hyun commented on a change in pull request #27161:
[SPARK-27686][DOC][SQL] Update migration guide for make Hive 2.3 dependency by
default
URL: https://github.com/apache/spark/pull/27161#discussion_r365075275
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File path: docs/sql-migration-guide.md
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@@ -265,6 +265,8 @@ license: |
- Since Spark 3.0, the function `percentile_approx` and its alias
`approx_percentile` only accept integral value with range in `[1, 2147483647]`
as its 3rd argument `accuracy`, fractional and string types are disallowed,
e.g. `percentile_approx(10.0, 0.2, 1.8D)` will cause `AnalysisException`. In
Spark version 2.4 and earlier, if `accuracy` is fractional or string value, it
will be coerced to an int value, `percentile_approx(10.0, 0.2, 1.8D)` is
operated as `percentile_approx(10.0, 0.2, 1)` which results in `10.0`.
- Since Spark 3.0, `location` and `comment` become reserved database
properties, Commands will fail if we specify reserved properties in `CREATE
DATABASE ... WITH DBPROPERTIES` and `ALTER DATABASE ... SET DBPROPERTIES`. We
need their specific clauses to specify them, e.g. `CREATE DATABASE test COMMENT
'any comment' LOCATION 'some path'`. We can set
`spark.sql.legacy.property.nonReserved` to `true` to ignore the
`ParseException`, in this case, these properties will be silently removed, e.g
`SET DBPROTERTIES('location'='/tmp')` will affect nothing. In Spark version 2.4
and earlier, these properties are neither reserved nor have side effects, e.g.
`SET DBPROTERTIES('location'='/tmp')` will not change the location of the
database but only create a headless property just like `'a'='b'`.
+
+ - Since Spark 3.0, we upgraded the built-in Hive from 1.2 to 2.3. This may
need to set `spark.sql.hive.metastore.version` and
`spark.sql.hive.metastore.jars` according to the version of the Hive metastore.
Review comment:
cc @gatorsmile , too.
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