org.apache.drill.exec.store

Class ColumnExplorer

java.lang.Object

org.apache.drill.exec.store.ColumnExplorer

public class ColumnExplorer
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ColumnExplorer.ImplicitFileColumns Columns that give information from where file data comes from.

Constructor Summary

Constructors

Constructor and Description
ColumnExplorer(FragmentContext context, List<SchemaPath> columns) Helper class that encapsulates logic for sorting out columns between actual table columns, partition columns and implicit file columns.
ColumnExplorer(OptionManager optionManager, List<SchemaPath> columns) Helper class that encapsulates logic for sorting out columns between actual table columns, partition columns and implicit file columns.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	containsImplicitColumns() Checks if current column selection contains implicit columns.
boolean	containsPartitionColumns() Checks if current column selection contains partition columns.
List<SchemaPath>	getTableColumns()
static Map<String,ColumnExplorer.ImplicitFileColumns>	initImplicitFileColumns(OptionManager optionManager) Creates case insensitive map with implicit file columns as keys and appropriate ImplicitFileColumns enum as values
static boolean	isPartitionColumn(OptionManager optionManager, SchemaPath column) Checks if given column is partition or not.
static boolean	isPartitionColumn(String partitionDesignator, String path) Checks if given column is partition or not.
boolean	isStarQuery()
Map<String,String>	populateImplicitColumns(FileWork work, String selectionRoot) Compares selection root and actual file path to determine partition columns values.
Map<String,String>	populateImplicitColumns(String filePath, String selectionRoot) Compares selection root and actual file path to determine partition columns values.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnExplorer

public ColumnExplorer(FragmentContext context,
              List<SchemaPath> columns)

Helper class that encapsulates logic for sorting out columns between actual table columns, partition columns and implicit file columns. Also populates map with implicit columns names as keys and their values

ColumnExplorer

public ColumnExplorer(OptionManager optionManager,
              List<SchemaPath> columns)

Helper class that encapsulates logic for sorting out columns between actual table columns, partition columns and implicit file columns. Also populates map with implicit columns names as keys and their values

Method Detail

initImplicitFileColumns

public static Map<String,ColumnExplorer.ImplicitFileColumns> initImplicitFileColumns(OptionManager optionManager)

Creates case insensitive map with implicit file columns as keys and appropriate ImplicitFileColumns enum as values

isPartitionColumn

public static boolean isPartitionColumn(OptionManager optionManager,
                        SchemaPath column)

Checks if given column is partition or not.

Parameters:

optionManager - options

column - column

Returns:

true if given column is partition, false otherwise

isPartitionColumn

public static boolean isPartitionColumn(String partitionDesignator,
                        String path)

Checks if given column is partition or not.

Parameters:

partitionDesignator - partition designator

path - column path

Returns:

true if given column is partition, false otherwise

populateImplicitColumns

public Map<String,String> populateImplicitColumns(FileWork work,
                                         String selectionRoot)

Compares selection root and actual file path to determine partition columns values. Adds implicit file columns according to columns list.

Returns:

map with columns names as keys and their values

populateImplicitColumns

public Map<String,String> populateImplicitColumns(String filePath,
                                         String selectionRoot)

Compares selection root and actual file path to determine partition columns values. Adds implicit file columns according to columns list.

Returns:

map with columns names as keys and their values

isStarQuery

public boolean isStarQuery()

getTableColumns

public List<SchemaPath> getTableColumns()

containsPartitionColumns

public boolean containsPartitionColumns()

Checks if current column selection contains partition columns.

Returns:

true if partition columns are present, false otherwise

containsImplicitColumns

public boolean containsImplicitColumns()

Checks if current column selection contains implicit columns.

Returns:

true if implicit columns are present, false otherwise