ESQL: Vector similarity ClassCastException on 1-dimension literal vector #136364
Description
This is a bug introduced in #135602.
Simplest reproduction:
POST test/_doc { "x": [0.1] }
POST _query { "query": "FROM test | EVAL y = v_l2_norm([1], x)" }
Yields:
{
"error": {
"reason": "class java.lang.Float cannot be cast to class java.util.ArrayList (java.lang.Float and java.util.ArrayList are in module java.base of loader 'bootstrap')",
"root_cause": [
{
"reason": "class java.lang.Float cannot be cast to class java.util.ArrayList (java.lang.Float and java.util.ArrayList are in module java.base of loader 'bootstrap')",
"type": "class_cast_exception"
}
],
"type": "class_cast_exception"
},
"status": 500
}
It seems as though 1-dimensional literal vectors are represented as Float and not ArrayList<Float>.