Question

我有两个数据框user_base和review_base。 User_base包含字段：elite，user_id，name，review_count，friends，粉丝。

Review_base包含以下字段：review_id，user_id，cool，stars，business，useful，funny。

我想找到所有用户及其评论列表，并从每个数据框中选择一些字段。这是我的代码段：

javax.script.ScriptException: ReferenceError: "document" is not defined in <eval> at line number 32
    at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:467)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:451)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:403)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:399)
    at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155)
    at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)
    at TestSymbolCreation.main(TestSymbolCreation.java:30)
Caused by: <eval>:32 ReferenceError: "document" is not defined
    at jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:57)
    at jdk.nashorn.internal.runtime.ECMAErrors.referenceError(ECMAErrors.java:319)
    at jdk.nashorn.internal.runtime.ECMAErrors.referenceError(ECMAErrors.java:291)
    at jdk.nashorn.internal.objects.Global.__noSuchProperty__(Global.java:1432)
    at jdk.nashorn.internal.scripts.Script$Recompilation$149$403515A$\^eval\_.L:1-1$L:32-8$exports(<eval>:32)
    at jdk.nashorn.internal.scripts.Script$87$\^eval\_.:program(<eval>:1)
    at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:640)
    at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:228)
    at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:446)
    ... 5 more

Review_per_user是一个RelationalGroupedDataset类型，但我希望Dataframe类型可以使用其他查询来操作它。我该怎么办呢？

Answer 1

 sudo apt-get install virtualbox

在两个数据帧上执行连接和groupBy

1 个答案: