elt function
Applies to: 
Databricks SQL Databricks Runtime
Returns the nth expression.
Syntax
elt(index, expr1 [, ...])
Arguments
index: An INTEGER expression greater than 0.exprN: Any expression that shares a least common type with allexprN.
Returns
The result has the type of the least common type of the exprN.
Index must be between 1 and the number of expr. If index is out of bounds, an INVALID_ARRAY_INDEX error is raised.
note
In Databricks Runtime, if spark.sql.ansi.enabled is false, the function returns NULL instead of an error if the index is out of bounds.
Examples
SQL
> SELECT elt(1, 'scala', 'java');
scala