Patrick McGloin created SPARK-24682:
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Summary: from_json / to_json do not handle java.sql.Date inside
Maps correctly
Key: SPARK-24682
URL: https://issues.apache.org/jira/browse/SPARK-24682
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.3.0
Reporter: Patrick McGloin
When a date is one of the types inside a Map, the from_json and to_json
functions do not handle it correctly. A date would be persisted like this:
"17710". And the from_json tries to read it in it complains with the error:
java.lang.ClassCastException: org.apache.spark.unsafe.types.UTF8String cannot
be cast to java.lang.Integer
Consider the following test, which will fail on the final show:
{color:#000080}
*case class* {color}UnitTestCaseClassWithDateInsideMap(map:
{color:#009f82}Map{color}[Date, Int])
test({color:#008000}*"Test a Date as key in a Map"*{color}) {
{color:#000080}*val* {color}map =
_UnitTestCaseClassWithDateInsideMap_({color:#800080}_Map_{color}(Date._valueOf_({color:#008000}*"2018-06-28"*{color})
-> {color:#0000FF}1{color}))
{color:#000080}*val* {color}options =
{color:#800080}_Map_{color}({color:#008000}*"timestampFormat"* {color}->
{color:#008000}*"yyyy/MM/dd HH:mm:ss.SSS"*{color},
{color:#008000}*"dateFormat"* {color}-> {color:#008000}*"yyyy/MM/dd"*{color})
{color:#000080}*val* {color}schema =
Encoders._product_[UnitTestCaseClassWithDateInsideMap].schema
{color:#000080}*val* {color}mapDF = {color:#800080}_Seq_{color}(map).toDF()
{color:#000080}*val* {color}jsonDF =
mapDF.select(_to_json_(_struct_(mapDF.columns.head, mapDF.columns.tail:_*),
options))
jsonDF.show()
{color:#000080}*val* {color}jsonString =
jsonDF.map(_.getString({color:#0000FF}0{color})).collect().head
{color:#000080}*val* {color}stringDF =
{color:#800080}_Seq_{color}(jsonString).toDF({color:#008000}*"json"*{color})
{color:#000080}*val* {color}parsedDF =
stringDF.select(_from_json_({color:#008000}*$"json"*{color}, schema, options))
parsedDF.show()
}
The result of the line "jsonDF.show()" is as follows:
+---------------------------------------------------+
|structstojson(named_struct(NamePlaceholder(), map))|
+---------------------------------------------------+
| \{"map":{"17710":1}}|
+---------------------------------------------------+
As can be seen the date is not formatted correctly. The error with
"parsedDF.show()" is:
java.lang.ClassCastException: org.apache.spark.unsafe.types.UTF8String cannot
be cast to java.lang.Integer
As you can see I have added in the options with date formats but that does not
have any impact. If I do the same tests with a Date outside a Map it works as
expected.
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