[core] Fix sequence.field parsing to trim spaces like primary-key (#6651)

Author: llphxd

paimon-api/src/main/java/org/apache/paimon/CoreOptions.java

@@ -2817,7 +2817,11 @@ public Integer dynamicBucketAssignerParallelism() {
 
     public List<String> sequenceField() {
         return options.getOptional(SEQUENCE_FIELD)
-                .map(s -> Arrays.asList(s.split(",")))
+                .map(
+                        s ->
+                                Arrays.stream(s.split(","))
+                                        .map(String::trim)
+                                        .collect(Collectors.toList()))
                 .orElse(Collections.emptyList());
     }
 

paimon-core/src/test/java/org/apache/paimon/CoreOptionsTest.java

@@ -86,4 +86,13 @@ public void testPrepareCommitWaitCompaction() {
         conf.set(CoreOptions.LOOKUP_WAIT, false);
         assertThat(options.prepareCommitWaitCompaction()).isFalse();
     }
+
+    @Test
+    public void testSequenceFieldTrim() {
+        Options conf = new Options();
+        conf.set(CoreOptions.SEQUENCE_FIELD, " f1 ,f2 ,  f3  ");
+
+        CoreOptions options = new CoreOptions(conf);
+        assertThat(options.sequenceField()).containsExactly("f1", "f2", "f3");
+    }
 }