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https://issues.apache.org/jira/browse/SPARK-11941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust updated SPARK-11941:
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Summary: JSON representation of nested StructTypes could be more uniform
(was: JSON representation of nested StructTypes is incorrect)
> JSON representation of nested StructTypes could be more uniform
> ---------------------------------------------------------------
>
> Key: SPARK-11941
> URL: https://issues.apache.org/jira/browse/SPARK-11941
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Henri DF
>
> I have a json file with a single row {code}{"a":1, "b": 1.0, "c": "asdfasd",
> "d":[1, 2, 4]}{code} After reading that file in, the schema is correctly
> inferred:
> {code}
> scala> df.printSchema
> root
> |-- a: long (nullable = true)
> |-- b: double (nullable = true)
> |-- c: string (nullable = true)
> |-- d: array (nullable = true)
> | |-- element: long (containsNull = true)
> {code}
> However, the json representation has a strange nesting under "type" for
> column "d":
> {code}
> scala> df.collect()(0).schema.prettyJson
> res60: String =
> {
> "type" : "struct",
> "fields" : [ {
> "name" : "a",
> "type" : "long",
> "nullable" : true,
> "metadata" : { }
> }, {
> "name" : "b",
> "type" : "double",
> "nullable" : true,
> "metadata" : { }
> }, {
> "name" : "c",
> "type" : "string",
> "nullable" : true,
> "metadata" : { }
> }, {
> "name" : "d",
> "type" : {
> "type" : "array",
> "elementType" : "long",
> "containsNull" : true
> },
> "nullable" : true,
> "metadata" : { }
> }]
> }
> {code}
> Specifically, in the last element, "type" is an object instead of being a
> string. I would expect the last element to be:
> {code}
> {
> "name":"d",
> "type":"array",
> "elementType":"long",
> "containsNull":true,
> "nullable":true,
> "metadata":{}
> }
> {code}
> There's a similar issue for nested structs.
> (I ran into this while writing node.js bindings, wanted to recurse down this
> representation, which would be nicer if it was uniform...).
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