Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/10597#issuecomment-171085276
it looks like `hash` is new in 2.0
```
/**
* Calculates the hash code of given columns, and returns the result as a
int column.
*
* @group misc_funcs
* @since 2.0
*/
@scala.annotation.varargs
def hash(cols: Column*): Column = withExpr {
new Murmur3Hash(cols.map(_.expr))
}
```
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L1823
so shouldn't be in 1.6.0
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