spark-shell如何粘贴换行代码

前言

平时经常性的有一些临时统计数据需求，用hive虽然很方便，但是等待时间有点长，spark-shell成为了我常用的一种方式，不过，一般我都是在IDEA把代码写好，然后复制到spark-shell上面，这个时候就会出现如下问题：
比如我复制如下代码（有换行）：

sql(sqlText = "select statis_month,count(*) from ods.ods_app_score_m where statis_month " +
      "like '2019%' group by statis_month")
      .show()

spark-shell中竟然显示如下：

scala> sql(sqlText = "select statis_month,count(*) from ods.ods_app_score_m where statis_month " +
     |       "like '2019%' group by statis_month")
res0: org.apache.spark.sql.DataFrame = [statis_month: string, count(1): bigint]

scala>       .show()

显然sql中的部分，它自动识别了换行，dataset的算子部分它并没有识别出来，就默认为是另一段代码了

如何解决

直接看操作

scala> :paste
// Entering paste mode (ctrl-D to finish)

sql(sqlText = "select statis_month,count(*) from ods.ods_app_score_m where statis_month " +
      "like '2019%' group by statis_month")
      .show()

// Exiting paste mode, now interpreting.

[Stage 0:>                                                      (0 + 0) / 16080]

解释：

• 输入 :paste ,进入spark-shell的复制模式
• 粘贴所复制的内容，敲回车键
• 按下ctrl + D开始执行代码

后记

spark-shell中有很多命令都是以:开始，比如退出为:quit，因此需要多多总结才能更加熟练使用spark-shell，可以输入:help查看常用的命令，如下：

scala> :help
All commands can be abbreviated, e.g., :he instead of :help.
:edit |        edit history
:help [command]          print this summary or command-specific help
:history [num]           show the history (optional num is commands to show)
:h?              search the history
:imports [name name ...] show import history, identifying sources of names
:implicits [-v]          show the implicits in scope
:javap       disassemble a file or class name
:line |        place line(s) at the end of history
:load              interpret lines in a file
:paste [-raw] [path]     enter paste mode or paste a file
:power                   enable power user mode
:quit                    exit the interpreter
:replay [options]        reset the repl and replay all previous commands
:require           add a jar to the classpath
:reset [options]         reset the repl to its initial state, forgetting all session entries
:save              save replayable session to a file
:sh        run a shell command (result is implicitly => List[String])
:settings       update compiler options, if possible; see reset
:silent                  disable/enable automatic printing of results
:type [-v]         display the type of an expression without evaluating it
:kind [-v]         display the kind of expression's type
:warnings                show the suppressed warnings from the most recent line which had any