ExpressionRewrite.java
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//
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package org.apache.doris.nereids.rules.expression;
import org.apache.doris.common.Pair;
import org.apache.doris.nereids.pattern.ExpressionPatternRules;
import org.apache.doris.nereids.pattern.ExpressionPatternTraverseListeners;
import org.apache.doris.nereids.pattern.MatchingContext;
import org.apache.doris.nereids.properties.OrderKey;
import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.rules.rewrite.OneRewriteRuleFactory;
import org.apache.doris.nereids.rules.rewrite.RewriteRuleFactory;
import org.apache.doris.nereids.trees.expressions.And;
import org.apache.doris.nereids.trees.expressions.EqualPredicate;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.NamedExpression;
import org.apache.doris.nereids.trees.expressions.OrderExpression;
import org.apache.doris.nereids.trees.expressions.Slot;
import org.apache.doris.nereids.trees.expressions.SlotReference;
import org.apache.doris.nereids.trees.expressions.functions.Function;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.logical.LogicalAggregate;
import org.apache.doris.nereids.trees.plans.logical.LogicalCTEConsumer;
import org.apache.doris.nereids.trees.plans.logical.LogicalFilter;
import org.apache.doris.nereids.trees.plans.logical.LogicalGenerate;
import org.apache.doris.nereids.trees.plans.logical.LogicalHaving;
import org.apache.doris.nereids.trees.plans.logical.LogicalJoin;
import org.apache.doris.nereids.trees.plans.logical.LogicalOlapTableSink;
import org.apache.doris.nereids.trees.plans.logical.LogicalOneRowRelation;
import org.apache.doris.nereids.trees.plans.logical.LogicalPartitionTopN;
import org.apache.doris.nereids.trees.plans.logical.LogicalProject;
import org.apache.doris.nereids.trees.plans.logical.LogicalRepeat;
import org.apache.doris.nereids.trees.plans.logical.LogicalSetOperation;
import org.apache.doris.nereids.trees.plans.logical.LogicalSink;
import org.apache.doris.nereids.trees.plans.logical.LogicalSort;
import org.apache.doris.nereids.trees.plans.logical.LogicalTopN;
import org.apache.doris.nereids.trees.plans.logical.LogicalWindow;
import org.apache.doris.nereids.util.ExpressionUtils;
import org.apache.doris.nereids.util.Utils;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
/**
* expression of plan rewrite rule.
*/
public class ExpressionRewrite implements RewriteRuleFactory {
protected final ExpressionRuleExecutor rewriter;
public ExpressionRewrite(ExpressionRewriteRule<ExpressionRewriteContext>... rules) {
this.rewriter = new ExpressionRuleExecutor(ImmutableList.copyOf(rules));
}
public ExpressionRewrite(ExpressionRuleExecutor rewriter) {
this.rewriter = Objects.requireNonNull(rewriter, "rewriter is null");
}
public Expression rewrite(Expression expression, ExpressionRewriteContext expressionRewriteContext) {
return rewriter.rewrite(expression, expressionRewriteContext);
}
@Override
public List<Rule> buildRules() {
return ImmutableList.of(
new GenerateExpressionRewrite().build(),
new OneRowRelationExpressionRewrite().build(),
new ProjectExpressionRewrite().build(),
new AggExpressionRewrite().build(),
new FilterExpressionRewrite().build(),
new JoinExpressionRewrite().build(),
new SortExpressionRewrite().build(),
new LogicalRepeatRewrite().build(),
new HavingExpressionRewrite().build(),
new LogicalPartitionTopNExpressionRewrite().build(),
new LogicalTopNExpressionRewrite().build(),
new LogicalSetOperationRewrite().build(),
new LogicalWindowRewrite().build(),
new LogicalCteConsumerRewrite().build(),
new LogicalResultSinkRewrite().build(),
new LogicalFileSinkRewrite().build(),
new LogicalHiveTableSinkRewrite().build(),
new LogicalIcebergTableSinkRewrite().build(),
new LogicalJdbcTableSinkRewrite().build(),
new LogicalOlapTableSinkRewrite().build(),
new LogicalDictionarySinkRewrite().build(),
new LogicalDeferMaterializeResultSinkRewrite().build(),
new LogicalOlapTableSinkExpressionRewrite().build());
}
/** GenerateExpressionRewrite */
public class GenerateExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalGenerate().thenApply(ctx -> {
LogicalGenerate<Plan> generate = ctx.root;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
List<Function> generators = generate.getGenerators();
List<Function> newGenerators = generators.stream()
.map(func -> (Function) rewriter.rewrite(func, context))
.collect(ImmutableList.toImmutableList());
if (generators.equals(newGenerators)) {
return generate;
}
return generate.withGenerators(newGenerators);
}).toRule(RuleType.REWRITE_GENERATE_EXPRESSION);
}
}
/** OneRowRelationExpressionRewrite */
public class OneRowRelationExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalOneRowRelation().thenApply(ctx -> {
LogicalOneRowRelation oneRowRelation = ctx.root;
List<NamedExpression> projects = oneRowRelation.getProjects();
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
Builder<NamedExpression> rewrittenExprs
= ImmutableList.builderWithExpectedSize(projects.size());
boolean changed = false;
for (NamedExpression project : projects) {
NamedExpression newProject = (NamedExpression) rewriter.rewrite(project, context);
if (!changed && !project.deepEquals(newProject)) {
changed = true;
}
rewrittenExprs.add(newProject);
}
return changed
? new LogicalOneRowRelation(oneRowRelation.getRelationId(), rewrittenExprs.build())
: oneRowRelation;
}).toRule(RuleType.REWRITE_ONE_ROW_RELATION_EXPRESSION);
}
}
/** ProjectExpressionRewrite */
public class ProjectExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalProject().thenApply(ctx -> {
LogicalProject<Plan> project = ctx.root;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
List<NamedExpression> projects = project.getProjects();
RewriteResult<NamedExpression> result = rewriteAll(projects, rewriter, context);
if (!result.changed) {
return project;
}
return project.withProjectsAndChild(result.result, project.child());
}).toRule(RuleType.REWRITE_PROJECT_EXPRESSION);
}
}
/** FilterExpressionRewrite */
public class FilterExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalFilter().thenApply(ctx -> {
LogicalFilter<Plan> filter = ctx.root;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
Expression originPredicate = filter.getPredicate();
Expression predicate = rewriter.rewrite(originPredicate, context);
if (predicate == originPredicate && !(predicate instanceof And)) {
return filter;
}
Set<Expression> newConjuncts = Utils.fastToImmutableSet(
ExpressionUtils.extractConjunction(predicate)
);
if (predicate.equals(originPredicate)) {
return filter;
}
return new LogicalFilter<>(newConjuncts, predicate, filter.child());
}).toRule(RuleType.REWRITE_FILTER_EXPRESSION);
}
}
/** OlapTableSinkExpressionRewrite */
public class LogicalOlapTableSinkExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalOlapTableSink().thenApply(ctx -> {
LogicalOlapTableSink<Plan> olapTableSink = ctx.root;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
List<Expression> partitionExprList = olapTableSink.getPartitionExprList();
RewriteResult<Expression> result = rewriteAll(partitionExprList, rewriter, context);
Map<Long, Expression> syncMvWhereClauses = olapTableSink.getSyncMvWhereClauses();
Map<Long, Expression> newSyncMvWhereClauses = new HashMap<>();
for (Map.Entry<Long, Expression> entry : syncMvWhereClauses.entrySet()) {
newSyncMvWhereClauses.put(entry.getKey(), rewriter.rewrite(entry.getValue(), context));
}
if (!result.changed && syncMvWhereClauses.equals(newSyncMvWhereClauses)) {
return olapTableSink;
}
return olapTableSink.withPartitionExprAndMvWhereClause(result.result, newSyncMvWhereClauses);
}).toRule(RuleType.REWRITE_OLAP_TABLE_SINK_EXPRESSION);
}
}
/** AggExpressionRewrite */
public class AggExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalAggregate().thenApply(ctx -> {
LogicalAggregate<Plan> agg = ctx.root;
List<Expression> groupByExprs = agg.getGroupByExpressions();
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
List<Expression> newGroupByExprs = rewriter.rewrite(groupByExprs, context);
List<NamedExpression> outputExpressions = agg.getOutputExpressions();
RewriteResult<NamedExpression> result = rewriteAll(outputExpressions, rewriter, context);
if (!result.changed) {
return agg;
}
return new LogicalAggregate<>(newGroupByExprs, result.result,
agg.isNormalized(), agg.getSourceRepeat(), agg.child());
}).toRule(RuleType.REWRITE_AGG_EXPRESSION);
}
}
/** JoinExpressionRewrite */
public class JoinExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalJoin().thenApply(ctx -> {
LogicalJoin<Plan, Plan> join = ctx.root;
List<Expression> hashJoinConjuncts = join.getHashJoinConjuncts();
List<Expression> otherJoinConjuncts = join.getOtherJoinConjuncts();
List<Expression> markJoinConjuncts = join.getMarkJoinConjuncts();
if (otherJoinConjuncts.isEmpty() && hashJoinConjuncts.isEmpty()
&& markJoinConjuncts.isEmpty()) {
return join;
}
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
Pair<Boolean, List<Expression>> newHashJoinConjuncts = rewriteConjuncts(hashJoinConjuncts, context);
Pair<Boolean, List<Expression>> newOtherJoinConjuncts = rewriteConjuncts(otherJoinConjuncts, context);
Pair<Boolean, List<Expression>> newMarkJoinConjuncts = rewriteConjuncts(markJoinConjuncts, context);
if (!newHashJoinConjuncts.first && !newOtherJoinConjuncts.first
&& !newMarkJoinConjuncts.first) {
return join;
}
return new LogicalJoin<>(join.getJoinType(), newHashJoinConjuncts.second,
newOtherJoinConjuncts.second, newMarkJoinConjuncts.second,
join.getDistributeHint(), join.getMarkJoinSlotReference(), join.children(),
join.getJoinReorderContext());
}).toRule(RuleType.REWRITE_JOIN_EXPRESSION);
}
private Pair<Boolean, List<Expression>> rewriteConjuncts(List<Expression> conjuncts,
ExpressionRewriteContext context) {
boolean isChanged = false;
// some rules will append new conjunct, we need to distinct it
// for example:
// pk = 2 or pk < 0
// after AddMinMax rule:
// (pk = 2 or pk < 0) and pk <= 2
//
// if not distinct it, the pk <= 2 will generate repeat forever
ImmutableSet.Builder<Expression> rewrittenConjuncts = new ImmutableSet.Builder<>();
for (Expression expr : conjuncts) {
Expression newExpr = rewriter.rewrite(expr, context);
newExpr = newExpr.isNullLiteral() && expr instanceof EqualPredicate
? expr.withChildren(rewriter.rewrite(expr.child(0), context),
rewriter.rewrite(expr.child(1), context))
: newExpr;
isChanged = isChanged || !newExpr.equals(expr);
rewrittenConjuncts.addAll(ExpressionUtils.extractConjunction(newExpr));
}
ImmutableList<Expression> newConjuncts = Utils.fastToImmutableList(rewrittenConjuncts.build());
return Pair.of(isChanged && !newConjuncts.equals(conjuncts), newConjuncts);
}
}
/** SortExpressionRewrite */
public class SortExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalSort().thenApply(ctx -> {
LogicalSort<Plan> sort = ctx.root;
List<OrderKey> orderKeys = sort.getOrderKeys();
ImmutableList.Builder<OrderKey> rewrittenOrderKeys
= ImmutableList.builderWithExpectedSize(orderKeys.size());
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
boolean changed = false;
for (OrderKey k : orderKeys) {
Expression expression = rewriter.rewrite(k.getExpr(), context);
changed |= expression != k.getExpr();
rewrittenOrderKeys.add(new OrderKey(expression, k.isAsc(), k.isNullFirst()));
}
return changed ? sort.withOrderKeys(rewrittenOrderKeys.build()) : sort;
}).toRule(RuleType.REWRITE_SORT_EXPRESSION);
}
}
/** HavingExpressionRewrite */
public class HavingExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalHaving().thenApply(ctx -> {
LogicalHaving<Plan> having = ctx.root;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
Set<Expression> newConjuncts = ImmutableSet.copyOf(ExpressionUtils.extractConjunction(
rewriter.rewrite(having.getPredicate(), context)));
if (newConjuncts.equals(having.getConjuncts())) {
return having;
}
return having.withConjuncts(newConjuncts);
}).toRule(RuleType.REWRITE_HAVING_EXPRESSION);
}
}
private class LogicalWindowRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalWindow().thenApply(ctx -> {
LogicalWindow<Plan> window = ctx.root;
List<NamedExpression> windowExpressions = window.getWindowExpressions();
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
RewriteResult<NamedExpression> result = rewriteAll(windowExpressions, rewriter, context);
if (!result.changed) {
return window;
}
return window.withExpressionsAndChild(result.result, window.child());
})
.toRule(RuleType.REWRITE_WINDOW_EXPRESSION);
}
}
private class LogicalSetOperationRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalSetOperation().thenApply(ctx -> {
LogicalSetOperation setOperation = ctx.root;
List<List<SlotReference>> slotsList = setOperation.getRegularChildrenOutputs();
List<List<SlotReference>> newSlotsList = new ArrayList<>();
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
boolean changed = false;
for (List<SlotReference> slots : slotsList) {
RewriteResult<SlotReference> result = rewriteAll(slots, rewriter, context);
changed |= result.changed;
newSlotsList.add(result.result);
}
if (!changed) {
return setOperation;
}
return setOperation.withChildrenAndTheirOutputs(setOperation.children(), newSlotsList);
})
.toRule(RuleType.REWRITE_SET_OPERATION_EXPRESSION);
}
}
private class LogicalTopNExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalTopN().thenApply(ctx -> {
LogicalTopN<Plan> topN = ctx.root;
List<OrderKey> orderKeys = topN.getOrderKeys();
ImmutableList.Builder<OrderKey> rewrittenOrderKeys
= ImmutableList.builderWithExpectedSize(orderKeys.size());
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
boolean changed = false;
for (OrderKey k : orderKeys) {
Expression expression = rewriter.rewrite(k.getExpr(), context);
changed |= expression != k.getExpr();
rewrittenOrderKeys.add(new OrderKey(expression, k.isAsc(), k.isNullFirst()));
}
return changed ? topN.withOrderKeys(rewrittenOrderKeys.build()) : topN;
}).toRule(RuleType.REWRITE_TOPN_EXPRESSION);
}
}
private class LogicalPartitionTopNExpressionRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalPartitionTopN().thenApply(ctx -> {
LogicalPartitionTopN<Plan> partitionTopN = ctx.root;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
List<OrderExpression> newOrderExpressions = new ArrayList<>();
boolean changed = false;
for (OrderExpression orderExpression : partitionTopN.getOrderKeys()) {
OrderKey orderKey = orderExpression.getOrderKey();
Expression expr = rewriter.rewrite(orderKey.getExpr(), context);
changed |= expr != orderKey.getExpr();
OrderKey newOrderKey = new OrderKey(expr, orderKey.isAsc(), orderKey.isNullFirst());
newOrderExpressions.add(new OrderExpression(newOrderKey));
}
RewriteResult<Expression> result = rewriteAll(partitionTopN.getPartitionKeys(),
rewriter, context);
changed |= result.changed;
if (!changed) {
return partitionTopN;
}
return partitionTopN.withPartitionKeysAndOrderKeys(result.result, newOrderExpressions);
}).toRule(RuleType.REWRITE_PARTITION_TOPN_EXPRESSION);
}
}
private class LogicalCteConsumerRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalCTEConsumer().thenApply(ctx -> {
LogicalCTEConsumer consumer = ctx.root;
boolean changed = false;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
ImmutableMap.Builder<Slot, Slot> cToPBuilder = ImmutableMap.builder();
ImmutableMultimap.Builder<Slot, Slot> pToCBuilder = ImmutableMultimap.builder();
for (Map.Entry<Slot, Slot> entry : consumer.getConsumerToProducerOutputMap().entrySet()) {
Slot key = (Slot) rewriter.rewrite(entry.getKey(), context);
Slot value = (Slot) rewriter.rewrite(entry.getValue(), context);
cToPBuilder.put(key, value);
pToCBuilder.put(value, key);
if (!key.equals(entry.getKey()) || !value.equals(entry.getValue())) {
changed = true;
}
}
return changed ? consumer.withTwoMaps(cToPBuilder.build(), pToCBuilder.build()) : consumer;
}).toRule(RuleType.REWRITE_TOPN_EXPRESSION);
}
}
private class LogicalResultSinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalResultSink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private class LogicalFileSinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalFileSink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private class LogicalHiveTableSinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalHiveTableSink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private class LogicalIcebergTableSinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalIcebergTableSink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private class LogicalJdbcTableSinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalJdbcTableSink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private class LogicalOlapTableSinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalOlapTableSink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private class LogicalDictionarySinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalDictionarySink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private class LogicalDeferMaterializeResultSinkRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalDeferMaterializeResultSink().thenApply(ExpressionRewrite.this::applyRewriteToSink)
.toRule(RuleType.REWRITE_SINK_EXPRESSION);
}
}
private LogicalSink<Plan> applyRewriteToSink(MatchingContext<? extends LogicalSink<Plan>> ctx) {
LogicalSink<Plan> sink = ctx.root;
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
List<NamedExpression> outputExprs = sink.getOutputExprs();
RewriteResult<NamedExpression> result = rewriteAll(outputExprs, rewriter, context);
if (!result.changed) {
return sink;
}
return sink.withOutputExprs(result.result);
}
/** LogicalRepeatRewrite */
public class LogicalRepeatRewrite extends OneRewriteRuleFactory {
@Override
public Rule build() {
return logicalRepeat().thenApply(ctx -> {
LogicalRepeat<Plan> repeat = ctx.root;
ImmutableList.Builder<List<Expression>> groupingExprs = ImmutableList.builder();
ExpressionRewriteContext context = new ExpressionRewriteContext(ctx.cascadesContext);
for (List<Expression> expressions : repeat.getGroupingSets()) {
groupingExprs.add(expressions.stream()
.map(expr -> rewriter.rewrite(expr, context))
.collect(ImmutableList.toImmutableList())
);
}
return repeat.withGroupSetsAndOutput(groupingExprs.build(),
repeat.getOutputExpressions().stream()
.map(output -> rewriter.rewrite(output, context))
.map(e -> (NamedExpression) e)
.collect(ImmutableList.toImmutableList()));
}).toRule(RuleType.REWRITE_REPEAT_EXPRESSION);
}
}
/** bottomUp */
public static ExpressionRewriteRule<ExpressionRewriteContext> bottomUp(
ExpressionPatternRuleFactory... ruleFactories) {
ImmutableList.Builder<ExpressionPatternMatchRule> rules = ImmutableList.builder();
ImmutableList.Builder<ExpressionTraverseListenerMapping> listeners = ImmutableList.builder();
for (ExpressionPatternRuleFactory ruleFactory : ruleFactories) {
if (ruleFactory instanceof ExpressionTraverseListenerFactory) {
List<ExpressionListenerMatcher<? extends Expression>> listenersMatcher
= ((ExpressionTraverseListenerFactory) ruleFactory).buildListeners();
for (ExpressionListenerMatcher<? extends Expression> listenerMatcher : listenersMatcher) {
listeners.add(new ExpressionTraverseListenerMapping(listenerMatcher));
}
}
for (ExpressionPatternMatcher<? extends Expression> patternMatcher : ruleFactory.buildRules()) {
rules.add(new ExpressionPatternMatchRule(patternMatcher));
}
}
return new ExpressionBottomUpRewriter(
new ExpressionPatternRules(rules.build()),
new ExpressionPatternTraverseListeners(listeners.build())
);
}
/** rewriteAll */
public static <E extends Expression> RewriteResult<E> rewriteAll(
Collection<E> exprs, ExpressionRuleExecutor rewriter, ExpressionRewriteContext context) {
ImmutableList.Builder<E> result = ImmutableList.builderWithExpectedSize(exprs.size());
boolean changed = false;
for (E expr : exprs) {
Expression rewrite = rewriter.rewrite(expr, context);
if (!rewrite.equals(expr)) {
changed = true;
}
result.add((E) rewrite);
}
return new RewriteResult<>(changed, result.build());
}
/** RewriteResult */
public static class RewriteResult<E> {
public final boolean changed;
public final List<E> result;
public RewriteResult(boolean changed, List<E> result) {
this.changed = changed;
this.result = result;
}
}
}