com.hazelcast.org.apache.calcite.rel.rules.DateRangeRules Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.rel.rules;
import com.hazelcast.org.apache.calcite.avatica.util.DateTimeUtils;
import com.hazelcast.org.apache.calcite.avatica.util.TimeUnitRange;
import com.hazelcast.org.apache.calcite.config.CalciteConnectionConfig;
import com.hazelcast.org.apache.calcite.plan.RelOptRule;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.rel.core.Filter;
import com.hazelcast.org.apache.calcite.rel.core.RelFactories;
import com.hazelcast.org.apache.calcite.rex.RexBuilder;
import com.hazelcast.org.apache.calcite.rex.RexCall;
import com.hazelcast.org.apache.calcite.rex.RexLiteral;
import com.hazelcast.org.apache.calcite.rex.RexNode;
import com.hazelcast.org.apache.calcite.rex.RexShuttle;
import com.hazelcast.org.apache.calcite.rex.RexUtil;
import com.hazelcast.org.apache.calcite.rex.RexVisitorImpl;
import com.hazelcast.org.apache.calcite.runtime.SqlFunctions;
import com.hazelcast.org.apache.calcite.sql.SqlBinaryOperator;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.fun.SqlStdOperatorTable;
import com.hazelcast.org.apache.calcite.tools.RelBuilder;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;
import com.hazelcast.org.apache.calcite.util.Bug;
import com.hazelcast.org.apache.calcite.util.DateString;
import com.hazelcast.org.apache.calcite.util.TimestampString;
import com.hazelcast.org.apache.calcite.util.TimestampWithTimeZoneString;
import com.hazelcast.org.apache.calcite.util.Util;
import com.hazelcast.com.google.common.annotations.VisibleForTesting;
import com.hazelcast.com.google.common.collect.BoundType;
import com.hazelcast.com.google.common.collect.ImmutableList;
import com.hazelcast.com.google.common.collect.ImmutableMap;
import com.hazelcast.com.google.common.collect.ImmutableRangeSet;
import com.hazelcast.com.google.common.collect.ImmutableSortedSet;
import com.hazelcast.com.google.common.collect.Range;
import com.hazelcast.com.google.common.collect.RangeSet;
import com.hazelcast.com.google.common.collect.TreeRangeSet;
import java.math.BigDecimal;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Deque;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TimeZone;
import java.util.function.Predicate;
import javax.annotation.Nonnull;
/**
* Collection of planner rules that convert
* {@code EXTRACT(timeUnit FROM dateTime) = constant},
* {@code FLOOR(dateTime to timeUnit} = constant} and
* {@code CEIL(dateTime to timeUnit} = constant} to
* {@code 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.
*/
public abstract class DateRangeRules {
private DateRangeRules() {}
private static final Predicate FILTER_PREDICATE =
filter -> {
try (ExtractFinder finder = ExtractFinder.THREAD_INSTANCES.get()) {
assert finder.timeUnits.isEmpty() && finder.opKinds.isEmpty()
: "previous user did not clean up";
filter.getCondition().accept(finder);
// bail out if there is no EXTRACT of YEAR, or call to FLOOR or CEIL
return finder.timeUnits.contains(TimeUnitRange.YEAR)
|| finder.opKinds.contains(SqlKind.FLOOR)
|| finder.opKinds.contains(SqlKind.CEIL);
}
};
public static final RelOptRule FILTER_INSTANCE =
new FilterDateRangeRule(RelFactories.LOGICAL_BUILDER);
private static final Map TIME_UNIT_CODES =
ImmutableMap.builder()
.put(TimeUnitRange.YEAR, Calendar.YEAR)
.put(TimeUnitRange.MONTH, Calendar.MONTH)
.put(TimeUnitRange.DAY, Calendar.DAY_OF_MONTH)
.put(TimeUnitRange.HOUR, Calendar.HOUR)
.put(TimeUnitRange.MINUTE, Calendar.MINUTE)
.put(TimeUnitRange.SECOND, Calendar.SECOND)
.put(TimeUnitRange.MILLISECOND, Calendar.MILLISECOND)
.build();
private static final Map TIME_UNIT_PARENTS =
ImmutableMap.builder()
.put(TimeUnitRange.MONTH, TimeUnitRange.YEAR)
.put(TimeUnitRange.DAY, TimeUnitRange.MONTH)
.put(TimeUnitRange.HOUR, TimeUnitRange.DAY)
.put(TimeUnitRange.MINUTE, TimeUnitRange.HOUR)
.put(TimeUnitRange.SECOND, TimeUnitRange.MINUTE)
.put(TimeUnitRange.MILLISECOND, TimeUnitRange.SECOND)
.put(TimeUnitRange.MICROSECOND, TimeUnitRange.SECOND)
.build();
/** Tests whether an expression contains one or more calls to the
* {@code EXTRACT} function, and if so, returns the time units used.
*
* The result is an immutable set in natural order. This is important,
* because code relies on the collection being sorted (so YEAR comes before
* MONTH before HOUR) and unique. A predicate on MONTH is not useful if there
* is no predicate on YEAR. Then when we apply the predicate on DAY it doesn't
* generate hundreds of ranges we'll later throw away. */
static ImmutableSortedSet extractTimeUnits(RexNode e) {
try (ExtractFinder finder = ExtractFinder.THREAD_INSTANCES.get()) {
assert finder.timeUnits.isEmpty() && finder.opKinds.isEmpty()
: "previous user did not clean up";
e.accept(finder);
return ImmutableSortedSet.copyOf(finder.timeUnits);
}
}
/** Replaces calls to EXTRACT, FLOOR and CEIL in an expression. */
@VisibleForTesting
public static RexNode replaceTimeUnits(RexBuilder rexBuilder, RexNode e,
String timeZone) {
ImmutableSortedSet timeUnits = extractTimeUnits(e);
if (!timeUnits.contains(TimeUnitRange.YEAR)) {
// Case when we have FLOOR or CEIL but no extract on YEAR.
// Add YEAR as TimeUnit so that FLOOR gets replaced in first iteration
// with timeUnit YEAR.
timeUnits = ImmutableSortedSet.naturalOrder()
.addAll(timeUnits).add(TimeUnitRange.YEAR).build();
}
final Map> operandRanges = new HashMap<>();
for (TimeUnitRange timeUnit : timeUnits) {
e = e.accept(
new ExtractShuttle(rexBuilder, timeUnit, operandRanges, timeUnits,
timeZone));
}
return e;
}
/** Rule that converts EXTRACT, FLOOR and CEIL in a {@link Filter} into a date
* range. */
@SuppressWarnings("WeakerAccess")
public static class FilterDateRangeRule extends RelOptRule implements TransformationRule {
public FilterDateRangeRule(RelBuilderFactory relBuilderFactory) {
super(operandJ(Filter.class, null, FILTER_PREDICATE, any()),
relBuilderFactory, "FilterDateRangeRule");
}
@Override public void onMatch(RelOptRuleCall call) {
final Filter filter = call.rel(0);
final RexBuilder rexBuilder = filter.getCluster().getRexBuilder();
final String timeZone = filter.getCluster().getPlanner().getContext()
.unwrap(CalciteConnectionConfig.class).timeZone();
final RexNode condition =
replaceTimeUnits(rexBuilder, filter.getCondition(), timeZone);
if (condition.equals(filter.getCondition())) {
return;
}
final RelBuilder relBuilder =
relBuilderFactory.create(filter.getCluster(), null);
relBuilder.push(filter.getInput())
.filter(condition);
call.transformTo(relBuilder.build());
}
}
/** Visitor that searches for calls to {@code EXTRACT}, {@code FLOOR} or
* {@code CEIL}, building a list of distinct time units. */
private static class ExtractFinder extends RexVisitorImpl
implements AutoCloseable {
private final Set timeUnits =
EnumSet.noneOf(TimeUnitRange.class);
private final Set opKinds = EnumSet.noneOf(SqlKind.class);
private static final ThreadLocal THREAD_INSTANCES =
ThreadLocal.withInitial(ExtractFinder::new);
private ExtractFinder() {
super(true);
}
@Override public Object visitCall(RexCall call) {
switch (call.getKind()) {
case EXTRACT:
final RexLiteral operand = (RexLiteral) call.getOperands().get(0);
timeUnits.add((TimeUnitRange) operand.getValue());
break;
case FLOOR:
case CEIL:
// Check that the call to FLOOR/CEIL is on date-time
if (call.getOperands().size() == 2) {
opKinds.add(call.getKind());
}
break;
}
return super.visitCall(call);
}
public void close() {
timeUnits.clear();
opKinds.clear();
}
}
/** Walks over an expression, replacing calls to
* {@code EXTRACT}, {@code FLOOR} and {@code CEIL} with date ranges. */
@VisibleForTesting
static class ExtractShuttle extends RexShuttle {
private final RexBuilder rexBuilder;
private final TimeUnitRange timeUnit;
private final Map> operandRanges;
private final Deque calls = new ArrayDeque<>();
private final ImmutableSortedSet timeUnitRanges;
private final String timeZone;
@VisibleForTesting
ExtractShuttle(RexBuilder rexBuilder, TimeUnitRange timeUnit,
Map> operandRanges,
ImmutableSortedSet timeUnitRanges, String timeZone) {
this.rexBuilder = Objects.requireNonNull(rexBuilder);
this.timeUnit = Objects.requireNonNull(timeUnit);
Bug.upgrade("Change type to Map> when"
+ " [CALCITE-1367] is fixed");
this.operandRanges = Objects.requireNonNull(operandRanges);
this.timeUnitRanges = Objects.requireNonNull(timeUnitRanges);
this.timeZone = timeZone;
}
@Override public RexNode visitCall(RexCall call) {
switch (call.getKind()) {
case EQUALS:
case GREATER_THAN_OR_EQUAL:
case LESS_THAN_OR_EQUAL:
case GREATER_THAN:
case LESS_THAN:
final RexNode op0 = call.operands.get(0);
final RexNode op1 = call.operands.get(1);
switch (op0.getKind()) {
case LITERAL:
assert op0 instanceof RexLiteral;
if (isExtractCall(op1)) {
assert op1 instanceof RexCall;
final RexCall subCall = (RexCall) op1;
RexNode operand = subCall.getOperands().get(1);
if (canRewriteExtract(operand)) {
return compareExtract(call.getKind().reverse(), operand,
(RexLiteral) op0);
}
}
if (isFloorCeilCall(op1)) {
assert op1 instanceof RexCall;
final RexCall subCall = (RexCall) op1;
final RexLiteral flag = (RexLiteral) subCall.operands.get(1);
final TimeUnitRange timeUnit = (TimeUnitRange) flag.getValue();
return compareFloorCeil(call.getKind().reverse(),
subCall.getOperands().get(0), (RexLiteral) op0,
timeUnit, op1.getKind() == SqlKind.FLOOR);
}
}
switch (op1.getKind()) {
case LITERAL:
assert op1 instanceof RexLiteral;
if (isExtractCall(op0)) {
assert op0 instanceof RexCall;
final RexCall subCall = (RexCall) op0;
RexNode operand = subCall.operands.get(1);
if (canRewriteExtract(operand)) {
return compareExtract(call.getKind(),
subCall.operands.get(1), (RexLiteral) op1);
}
}
if (isFloorCeilCall(op0)) {
final RexCall subCall = (RexCall) op0;
final RexLiteral flag = (RexLiteral) subCall.operands.get(1);
final TimeUnitRange timeUnit = (TimeUnitRange) flag.getValue();
return compareFloorCeil(call.getKind(),
subCall.getOperands().get(0), (RexLiteral) op1,
timeUnit, op0.getKind() == SqlKind.FLOOR);
}
}
// fall through
default:
calls.push(call);
try {
return super.visitCall(call);
} finally {
calls.pop();
}
}
}
private boolean canRewriteExtract(RexNode operand) {
// We rely on timeUnits being sorted (so YEAR comes before MONTH
// before HOUR) and unique. If we have seen a predicate on YEAR,
// operandRanges will not be empty. This checks whether we can rewrite
// the "extract" condition. For example, in the condition
//
// extract(MONTH from time) = someValue
// OR extract(YEAR from time) = someValue
//
// we cannot rewrite extract on MONTH.
if (timeUnit == TimeUnitRange.YEAR) {
return true;
}
final RangeSet calendarRangeSet = operandRanges.get(operand);
if (calendarRangeSet == null || calendarRangeSet.isEmpty()) {
return false;
}
for (Range range : calendarRangeSet.asRanges()) {
// Cannot reWrite if range does not have an upper or lower bound
if (!range.hasUpperBound() || !range.hasLowerBound()) {
return false;
}
}
return true;
}
@Override protected List visitList(List exprs,
boolean[] update) {
if (exprs.isEmpty()) {
return ImmutableList.of(); // a bit more efficient
}
switch (calls.peek().getKind()) {
case AND:
return super.visitList(exprs, update);
default:
if (timeUnit != TimeUnitRange.YEAR) {
// Already visited for lower TimeUnit ranges in the loop below.
// Early bail out.
//noinspection unchecked
return (List) exprs;
}
final Map> save =
ImmutableMap.copyOf(operandRanges);
final ImmutableList.Builder clonedOperands =
ImmutableList.builder();
for (RexNode operand : exprs) {
RexNode clonedOperand = operand;
for (TimeUnitRange timeUnit : timeUnitRanges) {
clonedOperand = clonedOperand.accept(
new ExtractShuttle(rexBuilder, timeUnit, operandRanges,
timeUnitRanges, timeZone));
}
if ((clonedOperand != operand) && (update != null)) {
update[0] = true;
}
clonedOperands.add(clonedOperand);
// Restore the state. For an operator such as "OR", an argument
// cannot inherit the previous argument's state.
operandRanges.clear();
operandRanges.putAll(save);
}
return clonedOperands.build();
}
}
boolean isExtractCall(RexNode e) {
switch (e.getKind()) {
case EXTRACT:
final RexCall call = (RexCall) e;
final RexLiteral flag = (RexLiteral) call.operands.get(0);
final TimeUnitRange timeUnit = (TimeUnitRange) flag.getValue();
return timeUnit == this.timeUnit;
default:
return false;
}
}
RexNode compareExtract(SqlKind comparison, RexNode operand,
RexLiteral literal) {
RangeSet rangeSet = operandRanges.get(operand);
if (rangeSet == null) {
rangeSet = ImmutableRangeSet.of().complement();
}
final RangeSet s2 = TreeRangeSet.create();
// Calendar.MONTH is 0-based
final int v = ((BigDecimal) literal.getValue()).intValue()
- (timeUnit == TimeUnitRange.MONTH ? 1 : 0);
if (!isValid(v, timeUnit)) {
// Comparison with an invalid value for timeUnit, always false.
return rexBuilder.makeLiteral(false);
}
for (Range r : rangeSet.asRanges()) {
final Calendar c;
switch (timeUnit) {
case YEAR:
c = Util.calendar();
c.clear();
c.set(v, Calendar.JANUARY, 1);
s2.add(extractRange(timeUnit, comparison, c));
break;
case MONTH:
case DAY:
case HOUR:
case MINUTE:
case SECOND:
if (r.hasLowerBound() && r.hasUpperBound()) {
c = (Calendar) r.lowerEndpoint().clone();
int i = 0;
while (next(c, timeUnit, v, r, i++ > 0)) {
s2.add(extractRange(timeUnit, comparison, c));
}
}
}
}
// Intersect old range set with new.
s2.removeAll(rangeSet.complement());
operandRanges.put(operand, ImmutableRangeSet.copyOf(s2));
final List nodes = new ArrayList<>();
for (Range r : s2.asRanges()) {
nodes.add(toRex(operand, r));
}
return RexUtil.composeDisjunction(rexBuilder, nodes);
}
// Assumes v is a valid value for given timeunit
private boolean next(Calendar c, TimeUnitRange timeUnit, int v,
Range r, boolean strict) {
final Calendar original = (Calendar) c.clone();
final int code = TIME_UNIT_CODES.get(timeUnit);
for (;;) {
c.set(code, v);
int v2 = c.get(code);
if (v2 < v) {
// E.g. when we set DAY=30 on 2014-02-01, we get 2014-02-30 because
// February has 28 days.
continue;
}
if (strict && original.compareTo(c) == 0) {
c.add(TIME_UNIT_CODES.get(TIME_UNIT_PARENTS.get(timeUnit)), 1);
continue;
}
if (!r.contains(c)) {
return false;
}
return true;
}
}
private static boolean isValid(int v, TimeUnitRange timeUnit) {
switch (timeUnit) {
case YEAR:
return v > 0;
case MONTH:
return v >= Calendar.JANUARY && v <= Calendar.DECEMBER;
case DAY:
return v > 0 && v <= 31;
case HOUR:
return v >= 0 && v <= 24;
case MINUTE:
case SECOND:
return v >= 0 && v <= 60;
default:
return false;
}
}
private @Nonnull RexNode toRex(RexNode operand, Range r) {
final List nodes = new ArrayList<>();
if (r.hasLowerBound()) {
final SqlBinaryOperator op = r.lowerBoundType() == BoundType.CLOSED
? SqlStdOperatorTable.GREATER_THAN_OR_EQUAL
: SqlStdOperatorTable.GREATER_THAN;
nodes.add(
rexBuilder.makeCall(op, operand,
dateTimeLiteral(rexBuilder, r.lowerEndpoint(), operand)));
}
if (r.hasUpperBound()) {
final SqlBinaryOperator op = r.upperBoundType() == BoundType.CLOSED
? SqlStdOperatorTable.LESS_THAN_OR_EQUAL
: SqlStdOperatorTable.LESS_THAN;
nodes.add(
rexBuilder.makeCall(op, operand,
dateTimeLiteral(rexBuilder, r.upperEndpoint(), operand)));
}
return RexUtil.composeConjunction(rexBuilder, nodes);
}
private RexLiteral dateTimeLiteral(RexBuilder rexBuilder, Calendar calendar,
RexNode operand) {
final TimestampString ts;
final int p;
switch (operand.getType().getSqlTypeName()) {
case TIMESTAMP:
ts = TimestampString.fromCalendarFields(calendar);
p = operand.getType().getPrecision();
return rexBuilder.makeTimestampLiteral(ts, p);
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
ts = TimestampString.fromCalendarFields(calendar);
final TimeZone tz = TimeZone.getTimeZone(this.timeZone);
final TimestampString localTs =
new TimestampWithTimeZoneString(ts, tz)
.withTimeZone(DateTimeUtils.UTC_ZONE)
.getLocalTimestampString();
p = operand.getType().getPrecision();
return rexBuilder.makeTimestampWithLocalTimeZoneLiteral(localTs, p);
case DATE:
final DateString d = DateString.fromCalendarFields(calendar);
return rexBuilder.makeDateLiteral(d);
default:
throw Util.unexpected(operand.getType().getSqlTypeName());
}
}
private Range extractRange(TimeUnitRange timeUnit, SqlKind comparison,
Calendar c) {
switch (comparison) {
case EQUALS:
return Range.closedOpen(round(c, timeUnit, true),
round(c, timeUnit, false));
case LESS_THAN:
return Range.lessThan(round(c, timeUnit, true));
case LESS_THAN_OR_EQUAL:
return Range.lessThan(round(c, timeUnit, false));
case GREATER_THAN:
return Range.atLeast(round(c, timeUnit, false));
case GREATER_THAN_OR_EQUAL:
return Range.atLeast(round(c, timeUnit, true));
default:
throw new AssertionError(comparison);
}
}
/** Returns a copy of a calendar, optionally rounded up to the next time
* unit. */
private Calendar round(Calendar c, TimeUnitRange timeUnit, boolean down) {
c = (Calendar) c.clone();
if (!down) {
final Integer code = TIME_UNIT_CODES.get(timeUnit);
final int v = c.get(code);
c.set(code, v + 1);
}
return c;
}
private RexNode compareFloorCeil(SqlKind comparison, RexNode operand,
RexLiteral timeLiteral, TimeUnitRange timeUnit, boolean floor) {
RangeSet rangeSet = operandRanges.get(operand);
if (rangeSet == null) {
rangeSet = ImmutableRangeSet.of().complement();
}
final RangeSet s2 = TreeRangeSet.create();
final Calendar c = timestampValue(timeLiteral);
final Range range = floor
? floorRange(timeUnit, comparison, c)
: ceilRange(timeUnit, comparison, c);
s2.add(range);
// Intersect old range set with new.
s2.removeAll(rangeSet.complement());
operandRanges.put(operand, ImmutableRangeSet.copyOf(s2));
if (range.isEmpty()) {
return rexBuilder.makeLiteral(false);
}
return toRex(operand, range);
}
private Calendar timestampValue(RexLiteral timeLiteral) {
switch (timeLiteral.getTypeName()) {
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
final TimeZone tz = TimeZone.getTimeZone(this.timeZone);
return Util.calendar(
SqlFunctions.timestampWithLocalTimeZoneToTimestamp(
timeLiteral.getValueAs(Long.class), tz));
case TIMESTAMP:
return Util.calendar(timeLiteral.getValueAs(Long.class));
case DATE:
// Cast date to timestamp with local time zone
final DateString d = timeLiteral.getValueAs(DateString.class);
return Util.calendar(d.getMillisSinceEpoch());
default:
throw Util.unexpected(timeLiteral.getTypeName());
}
}
private Range floorRange(TimeUnitRange timeUnit, SqlKind comparison,
Calendar c) {
Calendar floor = floor(c, timeUnit);
boolean boundary = floor.equals(c);
switch (comparison) {
case EQUALS:
return Range.closedOpen(floor, boundary ? increment(floor, timeUnit) : floor);
case LESS_THAN:
return boundary ? Range.lessThan(floor) : Range.lessThan(increment(floor, timeUnit));
case LESS_THAN_OR_EQUAL:
return Range.lessThan(increment(floor, timeUnit));
case GREATER_THAN:
return Range.atLeast(increment(floor, timeUnit));
case GREATER_THAN_OR_EQUAL:
return boundary ? Range.atLeast(floor) : Range.atLeast(increment(floor, timeUnit));
default:
throw Util.unexpected(comparison);
}
}
private Range ceilRange(TimeUnitRange timeUnit, SqlKind comparison,
Calendar c) {
final Calendar ceil = ceil(c, timeUnit);
boolean boundary = ceil.equals(c);
switch (comparison) {
case EQUALS:
return Range.openClosed(boundary ? decrement(ceil, timeUnit) : ceil, ceil);
case LESS_THAN:
return Range.atMost(decrement(ceil, timeUnit));
case LESS_THAN_OR_EQUAL:
return boundary ? Range.atMost(ceil) : Range.atMost(decrement(ceil, timeUnit));
case GREATER_THAN:
return boundary ? Range.greaterThan(ceil) : Range.greaterThan(decrement(ceil, timeUnit));
case GREATER_THAN_OR_EQUAL:
return Range.greaterThan(decrement(ceil, timeUnit));
default:
throw Util.unexpected(comparison);
}
}
boolean isFloorCeilCall(RexNode e) {
switch (e.getKind()) {
case FLOOR:
case CEIL:
final RexCall call = (RexCall) e;
return call.getOperands().size() == 2;
default:
return false;
}
}
private Calendar increment(Calendar c, TimeUnitRange timeUnit) {
c = (Calendar) c.clone();
c.add(TIME_UNIT_CODES.get(timeUnit), 1);
return c;
}
private Calendar decrement(Calendar c, TimeUnitRange timeUnit) {
c = (Calendar) c.clone();
c.add(TIME_UNIT_CODES.get(timeUnit), -1);
return c;
}
private Calendar ceil(Calendar c, TimeUnitRange timeUnit) {
Calendar floor = floor(c, timeUnit);
return floor.equals(c) ? floor : increment(floor, timeUnit);
}
/**
* Computes floor of a calendar to a given time unit.
*
* @return returns a copy of calendar, floored to the given time unit
*/
private Calendar floor(Calendar c, TimeUnitRange timeUnit) {
c = (Calendar) c.clone();
switch (timeUnit) {
case YEAR:
c.set(TIME_UNIT_CODES.get(TimeUnitRange.MONTH), Calendar.JANUARY);
// fall through; need to zero out lower time units
case MONTH:
c.set(TIME_UNIT_CODES.get(TimeUnitRange.DAY), 1);
// fall through; need to zero out lower time units
case DAY:
c.set(TIME_UNIT_CODES.get(TimeUnitRange.HOUR), 0);
// fall through; need to zero out lower time units
case HOUR:
c.set(TIME_UNIT_CODES.get(TimeUnitRange.MINUTE), 0);
// fall through; need to zero out lower time units
case MINUTE:
c.set(TIME_UNIT_CODES.get(TimeUnitRange.SECOND), 0);
// fall through; need to zero out lower time units
case SECOND:
c.set(TIME_UNIT_CODES.get(TimeUnitRange.MILLISECOND), 0);
}
return c;
}
}
}