Package org.apache.drill.exec.planner

Class StarColumnHelper

java.lang.Object

org.apache.drill.exec.planner.StarColumnHelper

public class StarColumnHelper
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final String	PREFIX_DELIMITER
static final String	PREFIXED_STAR_COLUMN

Constructor Summary

Constructors

Constructor	Description
StarColumnHelper()

Method Summary

Modifier and Type	Method	Description
static boolean	containsStarColumn(org.apache.calcite.rel.type.RelDataType type)
static boolean	containsStarColumnInProject(org.apache.calcite.rel.type.RelDataType inputRowType, List<org.apache.calcite.rex.RexNode> projExprs)
static String	extractColumnPrefix(String fieldName)
static String	extractStarColumnPrefix(String fieldName)
static boolean	isNonPrefixedStarColumn(String fieldName)
static boolean	isPrefixedStarColumn(String fieldName)
static boolean	isRegularColumnOrExp(String fieldName)
static boolean	isStarColumn(String fieldName)
static boolean	subsumeColumn(Map<String,String> prefixMap, String fieldName)

Methods inherited from class java.lang.Object

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

Field Details

PREFIX_DELIMITER

public static final String PREFIX_DELIMITER

See Also:

• Constant Field Values

PREFIXED_STAR_COLUMN

public static final String PREFIXED_STAR_COLUMN

See Also:

• Constant Field Values

Constructor Details

StarColumnHelper

public StarColumnHelper()

Method Details

containsStarColumn

public static boolean containsStarColumn(org.apache.calcite.rel.type.RelDataType type)

containsStarColumnInProject

public static boolean containsStarColumnInProject(org.apache.calcite.rel.type.RelDataType inputRowType,
 List<org.apache.calcite.rex.RexNode> projExprs)

isPrefixedStarColumn

public static boolean isPrefixedStarColumn(String fieldName)

isNonPrefixedStarColumn

public static boolean isNonPrefixedStarColumn(String fieldName)

isStarColumn

public static boolean isStarColumn(String fieldName)

isRegularColumnOrExp

public static boolean isRegularColumnOrExp(String fieldName)

extractStarColumnPrefix

public static String extractStarColumnPrefix(String fieldName)

extractColumnPrefix

public static String extractColumnPrefix(String fieldName)

subsumeColumn

public static boolean subsumeColumn(Map<String,String> prefixMap,
 String fieldName)