org.apache.drill.common.logical.data

Class Order.Ordering

java.lang.Object

org.apache.drill.common.logical.data.Order.Ordering

Enclosing class:

Order

public static class Order.Ordering
extends Object

Representation of a SQL <sort specification>.

Field Summary

Fields

Modifier and Type	Field and Description
static String	NULLS_FIRST
static String	NULLS_LAST
static String	NULLS_UNSPECIFIED
static String	ORDER_ASC
static String	ORDER_ASCENDING
static String	ORDER_DESC
static String	ORDER_DESCENDING

Constructor Summary

Constructors

Constructor and Description
Ordering(org.apache.calcite.rel.RelFieldCollation.Direction direction, LogicalExpression e)
Ordering(org.apache.calcite.rel.RelFieldCollation.Direction direction, LogicalExpression e, org.apache.calcite.rel.RelFieldCollation.NullDirection nullOrdering)
Ordering(String strOrderingSpec, LogicalExpression expr, String strNullOrdering) Constructs a sort specification.

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.rel.RelFieldCollation.Direction	getDirection()
LogicalExpression	getExpr()
org.apache.calcite.rel.RelFieldCollation.NullDirection	getNullDirection()
static org.apache.calcite.rel.RelFieldCollation.NullDirection	getNullOrderingFromString(String strNullOrdering)
String	getOrder()
static org.apache.calcite.rel.RelFieldCollation.Direction	getOrderingSpecFromString(String strDirection)
boolean	nullsSortHigh() Reports whether NULL sorts high or low in this ordering.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ORDER_ASC

public static final String ORDER_ASC

See Also:

Constant Field Values

ORDER_DESC

public static final String ORDER_DESC

See Also:

Constant Field Values

ORDER_ASCENDING

public static final String ORDER_ASCENDING

See Also:

Constant Field Values

ORDER_DESCENDING

public static final String ORDER_DESCENDING

See Also:

Constant Field Values

NULLS_FIRST

public static final String NULLS_FIRST

See Also:

Constant Field Values

NULLS_LAST

public static final String NULLS_LAST

See Also:

Constant Field Values

NULLS_UNSPECIFIED

public static final String NULLS_UNSPECIFIED

See Also:

Constant Field Values

Constructor Detail

Ordering

public Ordering(String strOrderingSpec,
                LogicalExpression expr,
                String strNullOrdering)

Constructs a sort specification.

Parameters:

expr - ...

strOrderingSpec - the <ordering specification> as string; allowed values: "ASC", "DESC", null; null specifies default <ordering specification> ("ASC" / RelFieldCollation.Direction.ASCENDING)

strNullOrdering - the <null ordering> as string; allowed values: "FIRST", "LAST", "UNSPECIFIED", null; null specifies default <null ordering> (omitted / RelFieldCollation.NullDirection.UNSPECIFIED, interpreted later)

Ordering

public Ordering(org.apache.calcite.rel.RelFieldCollation.Direction direction,
                LogicalExpression e,
                org.apache.calcite.rel.RelFieldCollation.NullDirection nullOrdering)

Ordering

public Ordering(org.apache.calcite.rel.RelFieldCollation.Direction direction,
                LogicalExpression e)

Method Detail

getOrderingSpecFromString

public static org.apache.calcite.rel.RelFieldCollation.Direction getOrderingSpecFromString(String strDirection)

getNullOrderingFromString

public static org.apache.calcite.rel.RelFieldCollation.NullDirection getNullOrderingFromString(String strNullOrdering)

toString

public String toString()

Overrides:

toString in class Object

getDirection

public org.apache.calcite.rel.RelFieldCollation.Direction getDirection()

getExpr

public LogicalExpression getExpr()

getOrder

public String getOrder()

getNullDirection

public org.apache.calcite.rel.RelFieldCollation.NullDirection getNullDirection()

nullsSortHigh

public boolean nullsSortHigh()

Reports whether NULL sorts high or low in this ordering.

Returns:

true if NULL sorts higher than any other value; false if NULL sorts lower than any other value