Patrick McGloin created SPARK-24682: ---------------------------------------
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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org