{
  "comment" : "This is generated by ESQL's AbstractFunctionTestCase. Do not edit it. See ../README.md for how to regenerate it.",
  "type" : "operator",
  "operator" : "IS NULL",
  "name" : "is_null",
  "description" : "Returns `true` if the value is `NULL`, `false` otherwise.",
  "note" : "If a field is only in some documents it will be `NULL` in the documents that did not contain it.",
  "signatures" : [
    {
      "params" : [
        {
          "name" : "field",
          "type" : "boolean",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "cartesian_point",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "cartesian_shape",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "counter_double",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "counter_integer",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "counter_long",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "date",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "date_nanos",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "double",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "geo_point",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "geo_shape",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "integer",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "ip",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "keyword",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "long",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "text",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "unsigned_long",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    },
    {
      "params" : [
        {
          "name" : "field",
          "type" : "version",
          "optional" : false,
          "description" : "Value to check. It can be a single- or multi-valued column or an expression."
        }
      ],
      "variadic" : false,
      "returnType" : "boolean"
    }
  ],
  "preview" : false,
  "snapshot_only" : false
}