Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/4014#issuecomment-71957621
[Schema-less Map-reduce
Scripts](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Transform#LanguageManualTransform-Schema-lessMap-reduceScripts)
is a feature of Hive transform syntax. That is there is no `AS` clause after
`USING my_script`. Hive assumes that the script output contains two columns:
`key` and `value`. The example SQL looks like:
`SELECT TRANSFORM (key, value) USING 'cat' FROM src`
Custom delimiter is defined by `ROW FORMAT` clause such as:
`SELECT TRANSFORM (key) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\002'
USING 'cat' AS (tKey) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\002' FROM src`
So you can use field delimiters other than default `\t`.
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