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
private static Pattern	TIMESTAMP_PATTERN

Constructor Summary

Constructors

Modifier	Constructor and Description
private	DruidDateTimeUtils()

Method Summary

Modifier and Type	Method and Description
static List<org.joda.time.Interval>	createInterval(RelDataType type, RexNode e) Generates a list of Intervals equivalent to a given expression.
static String	extractGranularity(RexCall call) Extracts granularity from a call FLOOR(<time> TO <timeunit>).
private static RexLiteral	extractLiteral(RexNode node)
protected static List<com.google.common.collect.Range>	extractRanges(RelDataType type, RexNode node, boolean withNot)
static long	extractTotalTime(List<org.joda.time.Interval> intervals) Extract the total time span covered by these intervals.
protected static List<com.google.common.collect.Range>	leafToRanges(RelDataType type, RexCall call, boolean withNot)
protected static Comparable	literalToType(RexLiteral literal, RelDataType type)
private static Double	toDouble(Object literal)
private static Float	toFloat(Object literal)
private static Integer	toInt(Object literal)
protected static List<org.joda.time.Interval>	toInterval(List<com.google.common.collect.Range> ranges)
private static Long	toLong(Object literal)
private static Comparable	toTimestamp(Object literal)

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

TIMESTAMP_PATTERN

private static final Pattern TIMESTAMP_PATTERN

Constructor Detail

DruidDateTimeUtils

private DruidDateTimeUtils()

Method Detail

createInterval

public static List<org.joda.time.Interval> createInterval(RelDataType type,
                                                          RexNode e)

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> ranges)

extractRanges

protected static List<com.google.common.collect.Range> extractRanges(RelDataType type,
                                                                     RexNode node,
                                                                     boolean withNot)

leafToRanges

protected static List<com.google.common.collect.Range> leafToRanges(RelDataType type,
                                                                    RexCall call,
                                                                    boolean withNot)

literalToType

protected static Comparable literalToType(RexLiteral literal,
                                          RelDataType type)

extractLiteral

private static RexLiteral extractLiteral(RexNode node)

toTimestamp

private static Comparable toTimestamp(Object literal)

toLong

private static Long toLong(Object literal)

toInt

private static Integer toInt(Object literal)

toFloat

private static Float toFloat(Object literal)

toDouble

private static Double toDouble(Object literal)

extractTotalTime

public static long extractTotalTime(List<org.joda.time.Interval> intervals)

Extract the total time span covered by these intervals. It does not check if the intervals overlap.

Parameters:

intervals - list of intervals

Returns:

total time span covered by these intervals

extractGranularity

public static String extractGranularity(RexCall call)

Extracts granularity from a call FLOOR(<time> TO <timeunit>). Timeunit specifies the granularity. Returns null if it cannot be inferred.

Parameters:

call - the function call

Returns:

the granularity, or null if it cannot be inferred