org.apache.calcite.adapter.enumerable

Interface NestedBlockBuilder

All Known Subinterfaces:

AggAddContext, AggResetContext, AggResultContext, WinAggAddContext, WinAggResetContext, WinAggResultContext

All Known Implementing Classes:

AggAddContextImpl, AggResetContextImpl, AggResultContextImpl, NestedBlockBuilderImpl, WinAggAddContextImpl, WinAggResetContextImpl, WinAggResultContextImpl

public interface NestedBlockBuilder

Allows to build nested code blocks with tracking of current context and the nullability of particular RexNode expressions.

See Also:

StrictAggImplementor.implementAdd(AggContext, AggAddContext)

Method Summary

Methods

Modifier and Type	Method and Description
BlockBuilder	currentBlock() Returns the current code block
Map<RexNode,Boolean>	currentNullables() Returns the current nullability state of rex nodes.
void	exitBlock() Leaves the current code block.
BlockBuilder	nestBlock() Starts nested code block.
void	nestBlock(BlockBuilder block) Uses given block as the new code context.
void	nestBlock(BlockBuilder block, Map<RexNode,Boolean> nullables) Uses given block as the new code context and the map of nullability.

Method Detail

nestBlock

BlockBuilder nestBlock()

Starts nested code block. The resulting block can optimize expressions and reuse already calculated values from the parent blocks.

Returns:

new code block that can optimize expressions and reuse already calculated values from the parent blocks.

nestBlock

void nestBlock(BlockBuilder block)

Uses given block as the new code context. The current block will be restored after exitBlock() call.

Parameters:

block - new code block

See Also:

exitBlock()

nestBlock

void nestBlock(BlockBuilder block,
             Map<RexNode,Boolean> nullables)

Uses given block as the new code context and the map of nullability. The current block will be restored after exitBlock() call.

Parameters:

block - new code block

nullables - map of expression to its nullability state

See Also:

exitBlock()

currentBlock

BlockBuilder currentBlock()

Returns the current code block

Returns:

current code block

currentNullables

Map<RexNode,Boolean> currentNullables()

Returns the current nullability state of rex nodes. The resulting value is the summary of all the maps in the block hierarchy.

Returns:

current nullability state of rex nodes

exitBlock

void exitBlock()

Leaves the current code block.

See Also:

nestBlock()