{"dsl": "", "json": {"eq": [{"len": null}, 0]}}
{"dsl": "", "json": {"eq": [{"count": null}, 0]}}
{"dsl": "", "json": {"eq": [{"len": {"ref": "field"}}, 0]}}
{"dsl": "", "json": {"eq": [{"count": {"ref": "field"}}, 0]}}
{"dsl": "", "json": {"any": [null, {"eq": [{"ref": "@it"}, 0]}]}}
{"dsl": "", "json": {"all": [null, {"eq": [{"ref": "@it"}, 0]}]}}
{"dsl": "", "json": {"any": [{"ref": "field"}, {"eq": [{"ref": "@it"}, 0]}]}}
{"dsl": "", "json": {"all": [{"ref": "field"}, {"eq": [{"ref": "@it"}, 0]}]}}
{"dsl": "", "json": {"isEmpty": null}}
{"dsl": "", "json": {"isEmpty": {"ref": "field"}}}
{"dsl": "", "json": {"eq": [{"index": [null, 0]}, 0]}}
{"dsl": "", "json": {"eq": [{"index": [{"ref": "field"}, 0]}, 0]}}
{"dsl": "", "json": {"startsWith": [null, "foo"]}}
{"dsl": "", "json": {"startsWith": [{"ref": "field"}, "foo"]}}
{"dsl": "", "json": {"endsWith": [null, "foo"]}}
{"dsl": "", "json": {"endsWith": [{"ref": "field"}, "foo"]}}
{"dsl": "", "json": {"contains": [null, "foo"]}}
{"dsl": "", "json": {"contains": [{"ref": "field"}, "foo"]}}
{"dsl": "", "json": {"matches": [null, "foo"]}}
{"dsl": "", "json": {"matches": [{"ref": "field"}, "foo"]}}
