Time type precision check failed

[kd97]

Hi, I noticed that the time type parsed from calcite will have a precision value check before generating substrait plan.

substrait-java/isthmus/src/main/java/io/substrait/isthmus/TypeConverter.java

Lines 67 to 87 in 5045aa3

	case TIME -> {
	if (type.getPrecision() != 6) {
	throw new UnsupportedOperationException(
	"unsupported time precision " + type.getPrecision());
	}
	yield creator.TIME;
	}
	case TIMESTAMP -> {
	if (type.getPrecision() != 6) {
	throw new UnsupportedOperationException(
	"unsupported timestamp precision " + type.getPrecision());
	}
	yield creator.TIMESTAMP;
	}
	case TIMESTAMP_WITH_LOCAL_TIME_ZONE -> {
	if (type.getPrecision() != 6) {
	throw new UnsupportedOperationException(
	"unsupported timestamptz precision " + type.getPrecision());
	}
	yield creator.TIMESTAMP_TZ;
	}

I added some timestamp related sql tests(sql ddl like "CREATE TABLE test(col_date DATE, col_time TIME(6), col_timestamp TIMESTAMP(6));"）and found time type precision value parsed from calcite will not be greater than three, will always make this check fail. Is there a bug in the use of time types?

unsupported timestamp precision 3
java.lang.UnsupportedOperationException: unsupported timestamp precision 3
	at io.substrait.isthmus.TypeConverter.convert(TypeConverter.java:77)
	at io.substrait.isthmus.TypeConverter.convert(TypeConverter.java:109)
	at io.substrait.isthmus.TypeConverter.toNamedStruct(TypeConverter.java:37)
	at io.substrait.isthmus.SubstraitRelVisitor.visit(SubstraitRelVisitor.java:76)
	at io.substrait.isthmus.SubstraitRelVisitor.visit(SubstraitRelVisitor.java:32)
	at io.substrait.isthmus.RelNodeVisitor.reverseAccept(RelNodeVisitor.java:85)
	at io.substrait.isthmus.SubstraitRelVisitor.apply(SubstraitRelVisitor.java:319)
	at io.substrait.isthmus.SubstraitRelVisitor.visit(SubstraitRelVisitor.java:122)
	at io.substrait.isthmus.SubstraitRelVisitor.visit(SubstraitRelVisitor.java:32)
	at io.substrait.isthmus.RelNodeVisitor.reverseAccept(RelNodeVisitor.java:95)
	at io.substrait.isthmus.SubstraitRelVisitor.apply(SubstraitRelVisitor.java:319)
	at io.substrait.isthmus.SubstraitRelVisitor.convert(SubstraitRelVisitor.java:340)
	at io.substrait.isthmus.SubstraitRelVisitor.convert(SubstraitRelVisitor.java:332)
	at io.substrait.isthmus.SqlToSubstrait.lambda$executeInner$0(SqlToSubstrait.java:120)
	at java.base/java.lang.Iterable.forEach(Iterable.java:75)
	at io.substrait.isthmus.SqlToSubstrait.executeInner(SqlToSubstrait.java:113)
	at io.substrait.isthmus.SqlToSubstrait.execute(SqlToSubstrait.java:81)