io.crate.planner

Class PositionalOrderBy

java.lang.Object

io.crate.planner.PositionalOrderBy

public class PositionalOrderBy
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
PositionalOrderBy(int[] indices, boolean[] reverseFlags, java.lang.Boolean[] nullsFirst)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
static PositionalOrderBy	fromStream(org.elasticsearch.common.io.stream.StreamInput in)
int	hashCode()
int[]	indices()
java.lang.Boolean[]	nullsFirst()
static PositionalOrderBy	of(OrderBy orderBy, java.util.List<? extends Symbol> orderByInputSymbols) Create OrderByPositions from a OrderBy definition.
boolean[]	reverseFlags()
static void	toStream(PositionalOrderBy orderBy, org.elasticsearch.common.io.stream.StreamOutput out)
java.lang.String	toString()
PositionalOrderBy	tryMapToNewOutputs(java.util.List<Symbol> oldOutputs, java.util.List<Symbol> newOutputs) Returns a new PositionalOrderBy where the indices are changed so that it uses the newOutputs as base.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

PositionalOrderBy

public PositionalOrderBy(int[] indices,
                         boolean[] reverseFlags,
                         java.lang.Boolean[] nullsFirst)

Method Detail

indices

public int[] indices()

reverseFlags

public boolean[] reverseFlags()

nullsFirst

public java.lang.Boolean[] nullsFirst()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

tryMapToNewOutputs

@Nullable
public PositionalOrderBy tryMapToNewOutputs(java.util.List<Symbol> oldOutputs,
                                                      java.util.List<Symbol> newOutputs)

Returns a new PositionalOrderBy where the indices are changed so that it uses the newOutputs as base.
Example:

     select b, a from (select a, b .. order by b desc, a asc nulls first)

                                            b        a
     oldOutputs:  [a, b]  -> orderByIndices 1 DESC , 0 ASC NULLS FIRST

                                            b        a
     newOutputs:  [b, a]  -> orderByIndices 0 DESC , 1 ASC NULLS FIRST
 

If the newOutputs don't contain a symbol that was used in the oldOutputs `null` is returned.

fromStream

@Nullable
public static PositionalOrderBy fromStream(org.elasticsearch.common.io.stream.StreamInput in)
                                              throws java.io.IOException

Throws:

java.io.IOException

toStream

public static void toStream(@Nullable
                            PositionalOrderBy orderBy,
                            org.elasticsearch.common.io.stream.StreamOutput out)
                     throws java.io.IOException

Throws:

java.io.IOException

of

@Nullable
public static PositionalOrderBy of(@Nullable
                                             OrderBy orderBy,
                                             java.util.List<? extends Symbol> orderByInputSymbols)

Create OrderByPositions from a OrderBy definition.

Parameters:

orderByInputSymbols - symbols which describe the output which should be sorted. OrderBy.orderBySymbols() must point to those symbols. This is used to create the correct indices mapping.

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object