%YAML 1.2
---
urn: extension:io.substrait:functions_set
scalar_functions:
-
name: "index_in"
description: >
Checks the membership of a value in a list of values
Returns the first 0-based index value of some input `needle` if `needle` is equal to
any element in `haystack`. Returns `NULL` if not found.
If `needle` is `NULL`, returns `NULL`.
If `needle` is `NaN`:
- Returns 0-based index of `NaN` in `input` (default)
- Returns `NULL` (if `NAN_IS_NOT_NAN` is specified)
impls:
- args:
- name: needle
value: any1
- name: haystack
value: list<any1>
options:
nan_equality:
values: [ NAN_IS_NAN, NAN_IS_NOT_NAN ]
nullability: DECLARED_OUTPUT
return: i64?