snuyanzin commented on code in PR #28733:
URL: https://github.com/apache/flink/pull/28733#discussion_r3578361965
##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/functions/CastFunctionITCase.java:
##########
@@ -132,9 +133,65 @@ Stream<TestSetSpec> getTestSetSpecs() {
specs.addAll(numericBounds());
specs.addAll(constructedTypes());
specs.addAll(bitmapCasts());
+ specs.addAll(variantCasts());
return specs.stream();
}
+ private static List<TestSetSpec> variantCasts() {
+ // A variant is produced with PARSE_JSON so that the source column
stays a STRING literal;
+ // there is no VARIANT literal to feed a source column directly. A
JSON integer is stored in
+ // the smallest integer type that fits (42 -> TINYINT), and numeric
casts are lenient, so it
+ // still widens to INT.
+ return Collections.singletonList(
+ TestSetSpec.forExpression("Cast a VARIANT produced by
PARSE_JSON to a primitive")
+ .onFieldsWithData("unused")
+ .andDataTypes(STRING())
+ .testResult(
+ call("PARSE_JSON", "42").cast(INT()),
+ "CAST(PARSE_JSON('42') AS INT)",
+ 42,
+ INT().notNull())
+ .testResult(
Review Comment:
just add a test like
```java
.testResult(
call("PARSE_JSON", "422").cast(TINYINT()),
"CAST(PARSE_JSON('422') AS TINYINT)",
422,
TINYINT().notNull())
```
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