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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2022/12/20 07:08:15 UTC
[GitHub] [doris] 924060929 commented on a diff in pull request #14863: [Feature](Nereids) Support bitmap for materialized index.
924060929 commented on code in PR #14863:
URL: https://github.com/apache/doris/pull/14863#discussion_r1052900899
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/logical/CountDistinctRewrite.java:
##########
@@ -0,0 +1,73 @@
+// 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 org.apache.doris.nereids.rules.rewrite.logical;
+
+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.trees.expressions.Expression;
+import org.apache.doris.nereids.trees.expressions.NamedExpression;
+import org.apache.doris.nereids.trees.expressions.functions.agg.BitmapUnionCount;
+import org.apache.doris.nereids.trees.expressions.functions.agg.Count;
+import org.apache.doris.nereids.trees.expressions.visitor.DefaultExpressionRewriter;
+import org.apache.doris.nereids.trees.plans.logical.LogicalAggregate;
+
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+
+/**
+ * Rewrite count distinct for bitmap and hll type value.
+ * <p>
+ * count(distinct bitmap_col) -> bitmap_union_count(bitmap col)
+ * todo: add support for HLL type.
+ */
+public class CountDistinctRewrite extends OneRewriteRuleFactory {
+ @Override
+ public Rule build() {
+ return logicalAggregate().then(agg -> {
+ List<NamedExpression> output = agg.getOutputExpressions()
+ .stream()
+ .map(CountDistinctRewriter::rewrite)
+ .map(NamedExpression.class::cast)
+ .collect(ImmutableList.toImmutableList());
+ return new LogicalAggregate<>(agg.getGroupByExpressions(), output,
+ agg.isDisassembled(), agg.isNormalized(),
+ agg.isFinalPhase(), agg.getAggPhase(), agg.getSourceRepeat(), agg.child());
+ }).toRule(RuleType.COUNT_DISTINCT_REWRITE);
+ }
+
+ private static class CountDistinctRewriter extends DefaultExpressionRewriter<Void> {
+ private static final CountDistinctRewriter INSTANCE = new CountDistinctRewriter();
+
+ public static Expression rewrite(Expression expr) {
+ return expr.accept(INSTANCE, null);
+ }
+
+ @Override
+ public Expression visitCount(Count count, Void context) {
+ if (count.isDistinct()) {
+ Expression child = count.child(0);
Review Comment:
count distinct can support multi columns, like `count(distinct id, value)`, so you should check the arity
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/logical/CountDistinctRewrite.java:
##########
@@ -0,0 +1,73 @@
+// 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 org.apache.doris.nereids.rules.rewrite.logical;
+
+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.trees.expressions.Expression;
+import org.apache.doris.nereids.trees.expressions.NamedExpression;
+import org.apache.doris.nereids.trees.expressions.functions.agg.BitmapUnionCount;
+import org.apache.doris.nereids.trees.expressions.functions.agg.Count;
+import org.apache.doris.nereids.trees.expressions.visitor.DefaultExpressionRewriter;
+import org.apache.doris.nereids.trees.plans.logical.LogicalAggregate;
+
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+
+/**
+ * Rewrite count distinct for bitmap and hll type value.
+ * <p>
+ * count(distinct bitmap_col) -> bitmap_union_count(bitmap col)
+ * todo: add support for HLL type.
+ */
+public class CountDistinctRewrite extends OneRewriteRuleFactory {
+ @Override
+ public Rule build() {
+ return logicalAggregate().then(agg -> {
+ List<NamedExpression> output = agg.getOutputExpressions()
+ .stream()
+ .map(CountDistinctRewriter::rewrite)
+ .map(NamedExpression.class::cast)
+ .collect(ImmutableList.toImmutableList());
+ return new LogicalAggregate<>(agg.getGroupByExpressions(), output,
+ agg.isDisassembled(), agg.isNormalized(),
+ agg.isFinalPhase(), agg.getAggPhase(), agg.getSourceRepeat(), agg.child());
+ }).toRule(RuleType.COUNT_DISTINCT_REWRITE);
+ }
+
+ private static class CountDistinctRewriter extends DefaultExpressionRewriter<Void> {
Review Comment:
a shorter rewriter:
```java
ExpressionUtils.rewriteDownShortCircuit(agg.getOutputExpressions(), expr -> {
if (expr instanceof Count && expr.arity() == 1 && ((Count) expr).isDistinct()
&& expr.child(0).getDataType().isBitmapType()) {
return new BitmapUnionCount(expr.child(0));
}
return expr;
})
```
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/logical/CountDistinctRewrite.java:
##########
@@ -0,0 +1,73 @@
+// 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 org.apache.doris.nereids.rules.rewrite.logical;
+
+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.trees.expressions.Expression;
+import org.apache.doris.nereids.trees.expressions.NamedExpression;
+import org.apache.doris.nereids.trees.expressions.functions.agg.BitmapUnionCount;
+import org.apache.doris.nereids.trees.expressions.functions.agg.Count;
+import org.apache.doris.nereids.trees.expressions.visitor.DefaultExpressionRewriter;
+import org.apache.doris.nereids.trees.plans.logical.LogicalAggregate;
+
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+
+/**
+ * Rewrite count distinct for bitmap and hll type value.
+ * <p>
+ * count(distinct bitmap_col) -> bitmap_union_count(bitmap col)
+ * todo: add support for HLL type.
+ */
+public class CountDistinctRewrite extends OneRewriteRuleFactory {
+ @Override
+ public Rule build() {
+ return logicalAggregate().then(agg -> {
+ List<NamedExpression> output = agg.getOutputExpressions()
+ .stream()
+ .map(CountDistinctRewriter::rewrite)
+ .map(NamedExpression.class::cast)
+ .collect(ImmutableList.toImmutableList());
+ return new LogicalAggregate<>(agg.getGroupByExpressions(), output,
+ agg.isDisassembled(), agg.isNormalized(),
+ agg.isFinalPhase(), agg.getAggPhase(), agg.getSourceRepeat(), agg.child());
Review Comment:
why not invoke `agg.withAggOutput(output)`?
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/Command.java:
##########
@@ -83,6 +83,11 @@ default List<Slot> getOutput() {
throw new RuntimeException("Command do not implement getOutput");
}
+ @Override
+ default List<Slot> getNonUserVisibleOutput() {
+ throw new RuntimeException("Command do not implement getNonUserVisibleOutput");
Review Comment:
why not supply an empty list?
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/util/ExpressionUtils.java:
##########
@@ -234,12 +235,20 @@ public static Slot selectMinimumColumn(List<Slot> slots) {
* Otherwise, return empty optional result.
*/
public static Optional<ExprId> isSlotOrCastOnSlot(Expression expr) {
+ return extractSlotOnCastOnSlot(expr).map(Slot::getExprId);
+ }
+
+ /**
+ * Check whether the input expression is a {@link org.apache.doris.nereids.trees.expressions.Slot}
+ * or at least one {@link Cast} on a {@link org.apache.doris.nereids.trees.expressions.Slot}
+ */
+ public static Optional<Slot> extractSlotOnCastOnSlot(Expression expr) {
Review Comment:
```suggestion
public static Optional<Slot> extractSlotOrCastOnSlot(Expression expr) {
```
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