org.apache.calcite.adapter.druid

Class DruidDateTimeUtils

java.lang.Object

org.apache.calcite.adapter.druid.DruidDateTimeUtils

public class DruidDateTimeUtils
extends Object

Utilities for generating intervals from RexNode.

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	LOGGER

Constructor Summary

Constructors

Modifier	Constructor and Description
private	DruidDateTimeUtils()

Method Summary

Modifier and Type	Method and Description
static List<org.joda.time.Interval>	createInterval(RexNode e, String timeZone) Generates a list of Intervals equivalent to a given expression.
static Granularity	extractGranularity(RexNode node, String timeZone) Infers granularity from a time unit.
protected static List<com.google.common.collect.Range<TimestampString>>	extractRanges(RexNode node, TimeZone timeZone, boolean withNot)
protected static List<com.google.common.collect.Range<TimestampString>>	leafToRanges(RexCall call, TimeZone timeZone, boolean withNot)
protected static TimestampString	literalValue(RexNode node, TimeZone timeZone)
static Granularity.Type	toDruidGranularity(org.apache.calcite.avatica.util.TimeUnitRange timeUnit) Translates Calcite TimeUnitRange to Druid Granularity
protected static List<org.joda.time.Interval>	toInterval(List<com.google.common.collect.Range<TimestampString>> ranges)
static String	toISOPeriodFormat(Granularity.Type type)

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

protected static final org.slf4j.Logger LOGGER

Constructor Detail

DruidDateTimeUtils

private DruidDateTimeUtils()

Method Detail

createInterval

@Nullable
public static List<org.joda.time.Interval> createInterval(RexNode e,
                                                                    String timeZone)

Generates a list of Intervals equivalent to a given expression. Assumes that all the predicates in the input reference a single column: the timestamp column.

toInterval

protected static List<org.joda.time.Interval> toInterval(List<com.google.common.collect.Range<TimestampString>> ranges)

extractRanges

@Nullable
protected static List<com.google.common.collect.Range<TimestampString>> extractRanges(RexNode node,
                                                                                                TimeZone timeZone,
                                                                                                boolean withNot)

leafToRanges

@Nullable
protected static List<com.google.common.collect.Range<TimestampString>> leafToRanges(RexCall call,
                                                                                               TimeZone timeZone,
                                                                                               boolean withNot)

literalValue

@Nullable
protected static TimestampString literalValue(RexNode node,
                                                        TimeZone timeZone)

extractGranularity

public static Granularity extractGranularity(RexNode node,
                                             String timeZone)

Infers granularity from a time unit. It supports FLOOR(<time> TO <timeunit>) and EXTRACT(<timeunit> FROM <time>). Returns null if it cannot be inferred.

Parameters:

node - the Rex node

Returns:

the granularity, or null if it cannot be inferred

toISOPeriodFormat

@Nullable
public static String toISOPeriodFormat(Granularity.Type type)

Parameters:

type - Druid Granularity to translate as period of time

Returns:

String representing the granularity as ISO8601 Period of Time, null for unknown case.

toDruidGranularity

@Nullable
public static Granularity.Type toDruidGranularity(org.apache.calcite.avatica.util.TimeUnitRange timeUnit)

Translates Calcite TimeUnitRange to Druid Granularity

Parameters:

timeUnit - Calcite Time unit to convert

Returns:

Druid Granularity or null