fhueske commented on code in PR #28741:
URL: https://github.com/apache/flink/pull/28741#discussion_r3585919636
##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/functions/JsonFunctionsITCase.java:
##########
@@ -316,59 +316,97 @@ private static List<TestSetSpec> isJsonSpec() {
TestSetSpec.forFunction(BuiltInFunctionDefinitions.IS_JSON)
.onFieldsWithData((String) null)
.andDataTypes(STRING())
- .testResult($("f0").isJson(), "f0 IS JSON", false,
BOOLEAN().notNull()),
+ // IS [NOT] JSON follows SQL three-valued logic and
returns NULL for a NULL
+ // input, see FLINK-39943. This holds for every JSON
type and for both the
+ // IS JSON and IS NOT JSON forms.
+ .testResult($("f0").isJson(), "f0 IS JSON", null,
BOOLEAN())
+ .testResult($("f0").isJson().not(), "f0 IS NOT JSON",
null, BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.VALUE), "f0 IS JSON
VALUE", null, BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.VALUE).not(),
+ "f0 IS NOT JSON VALUE",
+ null,
+ BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.SCALAR),
+ "f0 IS JSON SCALAR",
+ null,
+ BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.SCALAR).not(),
+ "f0 IS NOT JSON SCALAR",
+ null,
+ BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.ARRAY), "f0 IS JSON
ARRAY", null, BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.ARRAY).not(),
+ "f0 IS NOT JSON ARRAY",
+ null,
+ BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.OBJECT),
+ "f0 IS JSON OBJECT",
+ null,
+ BOOLEAN())
+ .testResult(
+ $("f0").isJson(JsonType.OBJECT).not(),
+ "f0 IS NOT JSON OBJECT",
+ null,
+ BOOLEAN()),
TestSetSpec.forFunction(BuiltInFunctionDefinitions.IS_JSON)
.onFieldsWithData("a")
.andDataTypes(STRING())
+ .testResult($("f0").isJson(), "f0 IS JSON", false,
BOOLEAN())
+ .testResult($("f0").isJson().not(), "f0 IS NOT JSON",
true, BOOLEAN()),
+ TestSetSpec.forFunction(BuiltInFunctionDefinitions.IS_JSON)
+ // A non-nullable input yields a non-nullable BOOLEAN
result.
+ .onFieldsWithData("a")
+ .andDataTypes(STRING().notNull())
Review Comment:
Yes, the comment is correct. `IS JSON` returns a boolean or NULL if the
input is NULL. If the input is non-nullable, the result of the function becomes
non-nullable too.
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