xinrong-meng commented on code in PR #46547:
URL: https://github.com/apache/spark/pull/46547#discussion_r1600443257
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sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -4611,6 +4611,16 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val LEGACY_INFER_MAP_STRUCT_TYPE_FROM_FIRST_ITEM =
+ buildConf("spark.sql.pyspark.legacy.inferMapTypeFromFirstPair.enabled")
+ .internal()
+ .doc("PySpark's SparkSession.createDataFrame infers the key/value types
of a map from all " +
+ "paris in the map by default. If this config is set to true, it
restores the legacy " +
+ "behavior of only inferring the type from the first pair.")
Review Comment:
nit: first non-null pair
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