Zouxxyy commented on code in PR #4848:
URL: https://github.com/apache/paimon/pull/4848#discussion_r1904824201
##########
paimon-common/src/test/java/org/apache/paimon/casting/CastExecutorTest.java:
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@@ -681,6 +690,65 @@ public void testTimeToTimestamp() {
DateTimeUtils.parseTimestampData("1970-01-01 " + time, 3));
}
+ @Test
+ public void testArrayToString() {
+ ArrayType arrayType = new ArrayType(DataTypes.INT());
+ GenericArray genericArray = new GenericArray(new Integer[] {1, null,
2});
+ compareCastResult(
+ CastExecutors.resolve(arrayType, DataTypes.STRING()),
+ genericArray,
+ BinaryString.fromString("[1, null, 2]"));
+ }
+
+ @Test
+ public void testMapToString() {
+ MapType mapType = new MapType(DataTypes.INT(), DataTypes.STRING());
+ Map<Object, Object> javaMap = new HashMap<>();
+ javaMap.put(1, BinaryString.fromString("i"));
+ javaMap.put(2, BinaryString.fromString("miss"));
+ javaMap.put(3, BinaryString.fromString("you"));
+ javaMap.put(4, null);
+ GenericMap genericMap = new GenericMap(javaMap);
+ compareCastResult(
+ CastExecutors.resolve(mapType, DataTypes.STRING()),
+ genericMap,
+ BinaryString.fromString("{1 -> i, 2 -> miss, 3 -> you, 4 ->
null}"));
Review Comment:
This is the behavior of Spark SQL's cast.
```
select cast (struct(1, 'a') as string), cast (map(1, 'a') as string), cast
(array(1,2,3) as string)
+----------------------------+-------------------------+------------------------------+
|CAST(struct(1, a) AS STRING)|CAST(map(1, a) AS STRING)|CAST(array(1, 2, 3)
AS STRING)|
+----------------------------+-------------------------+------------------------------+
| {1, a}| {1 -> a}|
[1, 2, 3]|
+----------------------------+-------------------------+------------------------------+
```
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