[ https://issues.apache.org/jira/browse/SPARK-4476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Armbrust updated SPARK-4476: ------------------------------------ Target Version/s: 1.4.0 (was: 1.3.0) > Use MapType for dict in json which has unique keys in each row. > --------------------------------------------------------------- > > Key: SPARK-4476 > URL: https://issues.apache.org/jira/browse/SPARK-4476 > Project: Spark > Issue Type: New Feature > Components: SQL > Reporter: Davies Liu > Priority: Critical > > For the jsonRDD like this: > {code} > """ {a: 1} """ > """ {b: 2} """ > """ {c: 3} """ > """ {d: 4} """ > """ {e: 5} """ > {code} > It will create a StructType with 5 fileds in it, each field come from a > different row. It will be a problem if the RDD is large. A StructType with > thousands or millions fields is hard to play with (will cause stack overflow > during serialization). > It should be MapType for this case. We need a clear rule to decide StructType > or MapType will be used for dict in json data. > cc [~yhuai] [~marmbrus] -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org