org.apache.druid.segment.join

Class JoinPrefixUtils

java.lang.Object

org.apache.druid.segment.join.JoinPrefixUtils

public class JoinPrefixUtils
extends Object

Utility class for working with prefixes in join operations

Constructor Summary

Constructors

Constructor and Description
JoinPrefixUtils()

Method Summary

Modifier and Type	Method and Description
static void	checkPrefixesForDuplicatesAndShadowing(List<String> prefixes) Check if any prefixes in the provided list duplicate or shadow each other.
static boolean	isPrefixedBy(String columnName, String prefix)
static String	validatePrefix(String prefix) Checks that "prefix" is a valid prefix for a join clause (see JoinableClause.getPrefix()) and, if so, returns it.

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinPrefixUtils

public JoinPrefixUtils()

Method Detail

validatePrefix

public static String validatePrefix(@Nullable
                                    String prefix)

Checks that "prefix" is a valid prefix for a join clause (see JoinableClause.getPrefix()) and, if so, returns it. Otherwise, throws an exception.

isPrefixedBy

public static boolean isPrefixedBy(String columnName,
                                   String prefix)

checkPrefixesForDuplicatesAndShadowing

public static void checkPrefixesForDuplicatesAndShadowing(List<String> prefixes)

Check if any prefixes in the provided list duplicate or shadow each other.

Parameters:

prefixes - A mutable list containing the prefixes to check. This list will be sorted by descending string length.