com.facebook.presto.parquet.rule

Class ParquetDereferencePushDown

java.lang.Object

com.facebook.presto.parquet.rule.ParquetDereferencePushDown

All Implemented Interfaces:

ConnectorPlanOptimizer

public abstract class ParquetDereferencePushDown
extends Object
implements ConnectorPlanOptimizer

Constructor Summary

Constructors

Constructor and Description
ParquetDereferencePushDown(RowExpressionService rowExpressionService)

Method Summary

Modifier and Type	Method and Description
protected abstract ColumnHandle	createSubfieldColumnHandle(ColumnHandle baseColumnHandle, Subfield subfield, Type subfieldDataType, String subfieldColumnName) Create connector specific ColumnHandle for given subfield that is being pushed into table scan.
protected abstract String	getColumnName(ColumnHandle columnHandle) ColumnHandle is an interface.
protected abstract boolean	isParquetDereferenceEnabled(ConnectorSession session, TableHandle tableHandle) Whether Parquet dereference pushdown is enabled for given TableHandle
PlanNode	optimize(PlanNode maxSubplan, ConnectorSession session, VariableAllocator variableAllocator, PlanNodeIdAllocator idAllocator)

Methods inherited from class java.lang.Object

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

Constructor Detail

ParquetDereferencePushDown

public ParquetDereferencePushDown(RowExpressionService rowExpressionService)

Method Detail

optimize

public PlanNode optimize(PlanNode maxSubplan,
                         ConnectorSession session,
                         VariableAllocator variableAllocator,
                         PlanNodeIdAllocator idAllocator)

Specified by:

optimize in interface ConnectorPlanOptimizer

isParquetDereferenceEnabled

protected abstract boolean isParquetDereferenceEnabled(ConnectorSession session,
                                                       TableHandle tableHandle)

Whether Parquet dereference pushdown is enabled for given TableHandle

getColumnName

protected abstract String getColumnName(ColumnHandle columnHandle)

ColumnHandle is an interface. Each connector implements its own version. Connector specific implementation of this method returns the column name given ColumnHandle refers to.

createSubfieldColumnHandle

protected abstract ColumnHandle createSubfieldColumnHandle(ColumnHandle baseColumnHandle,
                                                           Subfield subfield,
                                                           Type subfieldDataType,
                                                           String subfieldColumnName)

Create connector specific ColumnHandle for given subfield that is being pushed into table scan.

Parameters:

baseColumnHandle - ColumnHandle for base column that given subfield is part of. Ex. in "msg.a.b", "msg" is the top level column. "a.b" is the subfield that is part of "msg". This ColumnHandle refers to "msg".

subfield - Subfield info.

subfieldDataType - Data type of the subfield.

subfieldColumnName - Name of the subfield column being referred in table scan output.

Returns: