org.apache.drill.exec.planner.sql.handlers

Class FindLimit0Visitor.RelDataTypeReader

java.lang.Object

org.apache.drill.exec.store.AbstractRecordReader

org.apache.drill.exec.planner.sql.handlers.FindLimit0Visitor.RelDataTypeReader

All Implemented Interfaces:

AutoCloseable, RecordReader

Enclosing class:

FindLimit0Visitor

public static class FindLimit0Visitor.RelDataTypeReader
extends AbstractRecordReader

Reader for column names and types.

Field Summary

Fields

Modifier and Type	Field and Description
List<String>	columnNames
List<TypeProtos.MajorType>	columnTypes

Fields inherited from class org.apache.drill.exec.store.AbstractRecordReader

DEFAULT_TEXT_COLS_TO_READ

Fields inherited from interface org.apache.drill.exec.store.RecordReader

ALLOCATOR_INITIAL_RESERVATION, ALLOCATOR_MAX_RESERVATION

Constructor Summary

Constructors

Constructor and Description
FindLimit0Visitor.RelDataTypeReader(List<String> columnNames, List<TypeProtos.MajorType> columnTypes)

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
int	next() Increments this record reader forward, writing via the provided output mutator into the output batch.
void	setup(OperatorContext context, OutputMutator output) Configure the RecordReader with the provided schema and the record batch that should be written to.

Methods inherited from class org.apache.drill.exec.store.AbstractRecordReader

allocate, getColumns, getDefaultColumnsToRead, isSkipQuery, isStarQuery, setColumns, toString, transformColumns

Methods inherited from class java.lang.Object

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

Field Detail

columnNames

public final List<String> columnNames

columnTypes

public final List<TypeProtos.MajorType> columnTypes

Constructor Detail

FindLimit0Visitor.RelDataTypeReader

public FindLimit0Visitor.RelDataTypeReader(List<String> columnNames,
                                   List<TypeProtos.MajorType> columnTypes)

Method Detail

setup

public void setup(OperatorContext context,
         OutputMutator output)
           throws ExecutionSetupException

Description copied from interface: RecordReader

Configure the RecordReader with the provided schema and the record batch that should be written to.

Parameters:

context - operator context for the reader

output - The place where output for a particular scan should be written. The record reader is responsible for mutating the set of schema values for that particular record.

Throws:

ExecutionSetupException

next

public int next()

Description copied from interface: RecordReader

Increments this record reader forward, writing via the provided output mutator into the output batch.

Returns:

The number of additional records added to the output.

close

public void close()
           throws Exception

Throws:

Exception