viirya commented on a change in pull request #27478: [SPARK-25829][SQL] Add
config `spark.sql.deduplicateMapKey.lastWinsPolicy.enabled` and change the
default behavior
URL: https://github.com/apache/spark/pull/27478#discussion_r376254710
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -2167,6 +2167,14 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val DEDUPLICATE_MAP_KEY_WITH_LAST_WINS_POLICY =
+ buildConf("spark.sql.deduplicateMapKey.lastWinsPolicy.enabled")
+ .doc("When true, use last wins policy to remove duplicated map keys in
built-in functions, " +
+ "this config takes effect in below build-in functions: CreateMap,
MapFromArrays, " +
+ "MapFromEntries, StringToMap, MapConcat and TransformKeys.")
Review comment:
We should mention if false then an exception will be thrown.
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