org.apache.calcite.rel.rules

Class DateRangeRules

java.lang.Object

org.apache.calcite.rel.rules.DateRangeRules

public abstract class DateRangeRules
extends Object

Collection of planner rules that convert EXTRACT(timeUnit FROM dateTime) = constant, FLOOR(dateTime to timeUnit = constant} and CEIL(dateTime to timeUnit = constant} to dateTime BETWEEN lower AND upper.

The rules allow conversion of queries on time dimension tables, such as

SELECT ... FROM sales JOIN time_by_day USING (time_id) WHERE time_by_day.the_year = 1997 AND time_by_day.the_month IN (4, 5, 6)

into

SELECT ... FROM sales JOIN time_by_day USING (time_id) WHERE the_date BETWEEN DATE '2016-04-01' AND DATE '2016-06-30'

and is especially useful for Druid, which has a single timestamp column.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DateRangeRules.FilterDateRangeRule Rule that converts EXTRACT, FLOOR and CEIL in a Filter into a date range.

Field Summary

Fields

Modifier and Type	Field and Description
static RelOptRule	FILTER_INSTANCE Rule that matches a Filter and converts calls to EXTRACT, FLOOR and CEIL functions to date ranges (typically using the BETWEEN operator).

Method Summary

Modifier and Type	Method and Description
static RexNode	replaceTimeUnits(RexBuilder rexBuilder, RexNode e, String timeZone) Replaces calls to EXTRACT, FLOOR and CEIL in an expression.

Methods inherited from class java.lang.Object

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

Field Detail

FILTER_INSTANCE

public static final RelOptRule FILTER_INSTANCE

Rule that matches a Filter and converts calls to EXTRACT, FLOOR and CEIL functions to date ranges (typically using the BETWEEN operator).

Method Detail

replaceTimeUnits

public static RexNode replaceTimeUnits(RexBuilder rexBuilder,
                                       RexNode e,
                                       String timeZone)

Replaces calls to EXTRACT, FLOOR and CEIL in an expression.