本文整理汇总了Java中org.apache.calcite.rel.RelFieldCollation.NullDirection.FIRST属性的典型用法代码示例。如果您正苦于以下问题：Java NullDirection.FIRST属性的具体用法？Java NullDirection.FIRST怎么用？Java NullDirection.FIRST使用的例子？那么恭喜您, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在类org.apache.calcite.rel.RelFieldCollation.NullDirection的用法示例。
在下文中一共展示了NullDirection.FIRST属性的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: nullsSortHigh
/**
* Reports whether NULL sorts high or low in this ordering.
*
* @return
* {@code true} if NULL sorts higher than any other value;
* {@code false} if NULL sorts lower than any other value
*/
public boolean nullsSortHigh() {
final boolean nullsHigh;
switch (nullOrdering) {
case UNSPECIFIED:
// Default: NULL sorts high: like NULLS LAST if ASC, FIRST if DESC.
nullsHigh = true;
break;
case FIRST:
// FIRST: NULL sorts low with ASC, high with DESC.
nullsHigh = Direction.DESCENDING == getDirection();
break;
case LAST:
// LAST: NULL sorts high with ASC, low with DESC.
nullsHigh = Direction.ASCENDING == getDirection();
break;
default:
throw new DrillRuntimeException(
"Unexpected " + NullDirection.class.getName() + " value other than "
+ NullDirection.FIRST + ", " + NullDirection.LAST + " or " + NullDirection.UNSPECIFIED + ": "
+ nullOrdering );
}
return nullsHigh;
}
示例2: test_Ordering_roundTripAscAndNullsFirst
@Test
public void test_Ordering_roundTripAscAndNullsFirst() {
Ordering src = new Ordering( Direction.ASCENDING, null, NullDirection.FIRST);
Ordering reconstituted =
new Ordering( (LogicalExpression) null, src.getOrder(), src.getNullDirection().toString() );
assertThat( reconstituted.getDirection(), equalTo( RelFieldCollation.Direction.ASCENDING ) );
assertThat( reconstituted.getNullDirection(), equalTo( NullDirection.FIRST ) );
}
示例3: nullsSortHigh
/**
* Reports whether NULL sorts high or low in this ordering.
*
* @return
* {@code true} if NULL sorts higher than any other value;
* {@code false} if NULL sorts lower than any other value
*/
public boolean nullsSortHigh() {
final boolean nullsHigh;
switch (nullOrdering) {
case UNSPECIFIED:
// Default: NULL sorts high: like NULLS LAST if ASC, FIRST if DESC.
nullsHigh = true;
break;
case FIRST:
// FIRST: NULL sorts low with ASC, high with DESC.
nullsHigh = Direction.DESCENDING == getDirection();
break;
case LAST:
// LAST: NULL sorts high with ASC, low with DESC.
nullsHigh = Direction.ASCENDING == getDirection();
break;
default:
throw new RuntimeException(
"Unexpected " + NullDirection.class.getName() + " value other than "
+ NullDirection.FIRST + ", " + NullDirection.LAST + " or " + NullDirection.UNSPECIFIED + ": "
+ nullOrdering );
}
return nullsHigh;
}
示例4: test_Ordering_roundTripAscAndNullsFirst
@Test
public void test_Ordering_roundTripAscAndNullsFirst() {
Ordering src = new Ordering( Direction.ASCENDING, null, NullDirection.FIRST);
Ordering reconstituted =
new Ordering( src.getDirection(), (LogicalExpression) null, src.getNullDirection() );
assertThat( reconstituted.getDirection(), equalTo( RelFieldCollation.Direction.ASCENDING ) );
assertThat( reconstituted.getNullDirection(), equalTo( NullDirection.FIRST ) );
}
示例5: Ordering
public Ordering(Direction direction, LogicalExpression e) {
this(direction, e, NullDirection.FIRST);
}