cloud-fan commented on a change in pull request #27542: [SPARK-30790]The
dataType of map() should be map<null,null>
URL: https://github.com/apache/spark/pull/27542#discussion_r378382513
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -2007,12 +2007,13 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
- val LEGACY_ARRAY_DEFAULT_TO_STRING =
- buildConf("spark.sql.legacy.arrayDefaultToStringType.enabled")
+ val LEGACY_CREATE_EMPTY_COLLECTION_USING_STRING_TYPE =
+ buildConf("spark.sql.legacy.createEmptyCollectionUsingStringType.enabled")
.internal()
- .doc("When set to true, it returns an empty array of string type when
the `array` " +
- "function is called without any parameters. Otherwise, it returns an
empty " +
- "array of `NullType`")
+ .doc("When set to true, it returns an empty array of string type and an
empty map with " +
Review comment:
let's match the migration guide:
```
When set to true, Spark returns an empty collection with `StringType` as
element type
if the `array`/`map` function is called without any parameters. Otherwise,
Spark returns
an empty collection with `NullType` as element type.
```
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