[jira] [Created] (SPARK-21450) List of NA is flattened inside a SparkR struct type

["Hossein Falaki (JIRA)" <ji...@apache.org>]

Hossein Falaki created SPARK-21450:
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             Summary: List of NA is flattened inside a SparkR struct type
                 Key: SPARK-21450
                 URL: https://issues.apache.org/jira/browse/SPARK-21450
             Project: Spark
          Issue Type: Bug
          Components: SparkR
    Affects Versions: 2.2.0
            Reporter: Hossein Falaki


Consider the following two cases copied from {{test_sparkSQL.R}}:

{code}
df <- as.DataFrame(list(list("col" = "{\"date\":\"21/10/2014\"}")))
schema <- structType(structField("date", "date"))
s1 <- collect(select(df, from_json(df$col, schema)))
s2 <- collect(select(df, from_json(df$col, schema2, dateFormat = "dd/MM/yyyy")))
{code}

If you inspect s1 using {{str(s1)}} you will find:
{code}
'data.frame':	2 obs. of  1 variable:
 $ jsontostructs(col):List of 2
  ..$ : logi NA
{code}

But for s2, running {{str(s2)}} results in:
{code}
'data.frame':	2 obs. of  1 variable:
 $ jsontostructs(col):List of 2
  ..$ :List of 1
  .. ..$ date: Date, format: "2014-10-21"
  .. ..- attr(*, "class")= chr "struct"
{code}

I assume this is not intentional and is just a subtle bug. Do you think otherwise? [~shivaram] and @ felixcheung




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