io.prestosql.operator

Interface PagesHashStrategy

All Known Implementing Classes:

SimplePagesHashStrategy

public interface PagesHashStrategy

Method Summary

Modifier and Type	Method and Description
void	appendTo(int blockIndex, int position, PageBuilder pageBuilder, int outputChannelOffset) Appends all values at the specified position to the page builder starting at outputChannelOffset.
int	compareSortChannelPositions(int leftBlockIndex, int leftBlockPosition, int rightBlockIndex, int rightBlockPosition) Compares sort channel (if applicable) values at the specified positions.
int	getChannelCount() Gets the number of columns appended by this PagesHashStrategy.
long	getSizeInBytes() Get the total of allocated size
long	hashPosition(int blockIndex, int position) Calculates the hash code the hashed columns in this PagesHashStrategy at the specified position.
long	hashRow(int position, Page page) Calculates the hash code at position in page.
boolean	isPositionNull(int blockIndex, int blockPosition) Checks if any of the hashed columns is null
boolean	isSortChannelPositionNull(int blockIndex, int blockPosition) Checks if sort channel is null at the specified position
boolean	positionEqualsPosition(int leftBlockIndex, int leftPosition, int rightBlockIndex, int rightPosition) Compares the hashed columns in this PagesHashStrategy at the specified positions.
boolean	positionEqualsPositionIgnoreNulls(int leftBlockIndex, int leftPosition, int rightBlockIndex, int rightPosition) Compares the hashed columns in this PagesHashStrategy at the specified positions.
boolean	positionEqualsRow(int leftBlockIndex, int leftPosition, int rightPosition, Page rightPage) Compares the hashed columns in this PagesHashStrategy to the values in the specified page.
boolean	positionEqualsRow(int leftBlockIndex, int leftPosition, int rightPosition, Page page, int[] rightChannels) Compares the hashed columns in this PagesHashStrategy to the hashed columns in the Page.
boolean	positionEqualsRowIgnoreNulls(int leftBlockIndex, int leftPosition, int rightPosition, Page rightPage) Compares the hashed columns in this PagesHashStrategy to the values in the specified page.
boolean	positionNotDistinctFromRow(int leftBlockIndex, int leftPosition, int rightPosition, Page page, int[] rightChannels) Compares the hashed columns in this PagesHashStrategy to the hashed columns in the Page.
boolean	rowEqualsRow(int leftPosition, Page leftPage, int rightPosition, Page rightPage) Compares the values in the specified pages.

Method Detail

getChannelCount

int getChannelCount()

Gets the number of columns appended by this PagesHashStrategy.

getSizeInBytes

long getSizeInBytes()

Get the total of allocated size

appendTo

void appendTo(int blockIndex,
              int position,
              PageBuilder pageBuilder,
              int outputChannelOffset)

Appends all values at the specified position to the page builder starting at outputChannelOffset.

hashPosition

long hashPosition(int blockIndex,
                  int position)

Calculates the hash code the hashed columns in this PagesHashStrategy at the specified position.

hashRow

long hashRow(int position,
             Page page)

Calculates the hash code at position in page. Page must have the same number of Blocks as the hashed columns and each entry is expected to be the same type.

rowEqualsRow

boolean rowEqualsRow(int leftPosition,
                     Page leftPage,
                     int rightPosition,
                     Page rightPage)

Compares the values in the specified pages. The values are compared positionally, so leftPage and rightPage must have the same number of entries as the hashed columns and each entry is expected to be the same type.

positionEqualsRow

boolean positionEqualsRow(int leftBlockIndex,
                          int leftPosition,
                          int rightPosition,
                          Page rightPage)

Compares the hashed columns in this PagesHashStrategy to the values in the specified page. The values are compared positionally, so rightPage must have the same number of entries as the hashed columns and each entry is expected to be the same type. rightPage is used if join uses filter function and must contain all columns from probe side of join.

positionEqualsRowIgnoreNulls

boolean positionEqualsRowIgnoreNulls(int leftBlockIndex,
                                     int leftPosition,
                                     int rightPosition,
                                     Page rightPage)

Compares the hashed columns in this PagesHashStrategy to the values in the specified page. The values are compared positionally, so rightPage must have the same number of entries as the hashed columns and each entry is expected to be the same type. rightPage is used if join uses filter function and must contain all columns from probe side of join.

This method does not perform any null checks.

positionEqualsRow

boolean positionEqualsRow(int leftBlockIndex,
                          int leftPosition,
                          int rightPosition,
                          Page page,
                          int[] rightChannels)

Compares the hashed columns in this PagesHashStrategy to the hashed columns in the Page. The values are compared positionally, so rightChannels must have the same number of entries as the hashed columns and each entry is expected to be the same type.

positionNotDistinctFromRow

boolean positionNotDistinctFromRow(int leftBlockIndex,
                                   int leftPosition,
                                   int rightPosition,
                                   Page page,
                                   int[] rightChannels)

Compares the hashed columns in this PagesHashStrategy to the hashed columns in the Page. The values are compared positionally under "not distinct from" semantics. rightChannels must have the same number of entries as the hashed columns and each entry is expected to be the same type.

positionEqualsPosition

boolean positionEqualsPosition(int leftBlockIndex,
                               int leftPosition,
                               int rightBlockIndex,
                               int rightPosition)

Compares the hashed columns in this PagesHashStrategy at the specified positions.

positionEqualsPositionIgnoreNulls

boolean positionEqualsPositionIgnoreNulls(int leftBlockIndex,
                                          int leftPosition,
                                          int rightBlockIndex,
                                          int rightPosition)

Compares the hashed columns in this PagesHashStrategy at the specified positions.

This method does not perform any null checks.

isPositionNull

boolean isPositionNull(int blockIndex,
                       int blockPosition)

Checks if any of the hashed columns is null

compareSortChannelPositions

int compareSortChannelPositions(int leftBlockIndex,
                                int leftBlockPosition,
                                int rightBlockIndex,
                                int rightBlockPosition)

Compares sort channel (if applicable) values at the specified positions.

isSortChannelPositionNull

boolean isSortChannelPositionNull(int blockIndex,
                                  int blockPosition)

Checks if sort channel is null at the specified position