xuanyuanking commented on a change in pull request #27478: [SPARK-25829][SQL]
Add config `spark.sql.legacy.allowDuplicatedMapKeys` and change the default
behavior
URL: https://github.com/apache/spark/pull/27478#discussion_r379802575
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -2167,6 +2167,16 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_ALLOW_DUPLICATED_MAP_KEY =
+ buildConf("spark.sql.legacy.allowDuplicatedMapKeys")
+ .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. Otherwise,
if this is false, " +
+ "which is the default, Spark will throw an exception while duplicated
map keys are " +
Review comment:
Thanks, done in b102c36.
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