cloud-fan commented on a change in pull request #27197: [SPARK-30507][SQL]
TableCalalog reserved properties shoudn't be changed via options or tblpropeties
URL: https://github.com/apache/spark/pull/27197#discussion_r366867414
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File path: docs/sql-migration-guide.md
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@@ -264,7 +264,79 @@ 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, the properties listing below become reserved, 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'`.
Review comment:
if we specify reserved properties in places like \`CREATE DATABASE ... WITH
DBPROPERTIES\` ...
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