apache-spark - 以字符串开头的 Spark Dataframe 搜索列

Question

我需要根据列值应以预定义字符串开头的条件过滤数据框。

我正在尝试以下操作:

 val domainConfigJSON = sqlContext.read
    .jdbc(url, "CONFIG", prop)
    .select("DID", "CONF", "KEY").filter("key like 'config.*'")

并获得异常:

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'KEY = 'config.*'' at line 1

Using spark: 1.6.1

Answer 1

您可以使用 startsWith Column 类中存在的函数。

myDataFrame.filter(col("columnName").startswith("PREFIX"))