Exception in thread “main“ org.apache.spark.sql.AnalysisException: Table or view not found: df； line

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问题描述：

编写Spark程序在调用自定义函数时出现如下问题 Exception in thread "main" org.apache.spark.sql.AnalysisException: Table or view not found: df; line 1 pos 30; 'Project [unresolvedalias('myFunction('Fruit), None)] +- 'UnresolvedRelation [df]

Exception in thread "main" org.apache.spark.sql.AnalysisException: