Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22919#discussion_r230701471
--- Diff: bin/spark-shell ---
@@ -32,7 +32,10 @@ if [ -z "${SPARK_HOME}" ]; then
source "$(dirname "$0")"/find-spark-home
fi
-export _SPARK_CMD_USAGE="Usage: ./bin/spark-shell [options]"
+export _SPARK_CMD_USAGE="Usage: ./bin/spark-shell [options]
+
+Scala REPL options:
+ -I <file> preload <file>, enforcing line-by-line
interpretation"
--- End diff --
Yea .. but `-i` doesn't handle implicits like toDF or symbols which are
pretty basic ones. I think we should better avoid to document it for now.
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