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This PR aims to introduce Window functions on MSQ by doing the following:
Introduce a Window querykit for handling window queries along with its factory and a processor for window queries
If a window operator is present with a partition by clause, pushes the partition as a shuffle spec of the previous stage
In presence of empty OVER() clause lets all operators loose on a single rac
In presence of no empty OVER() clause, breaks down each window into individual stages
Associated machinery to handle window functions in MSQ
Introduced a separate hidden engine feature WINDOW_LEAF_OPERATOR which is set only for MSQ engine. In presence of this feature, the planner plans without the leaf operators by creating a window query over an inner scan query. In case of native this is set to false and the planner generates the leafOperators
Guardrails around materialization
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91 changes: 91 additions & 0 deletions
91
...ge-query/src/main/java/org/apache/druid/msq/indexing/error/TooManyRowsInAWindowFault.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.druid.msq.indexing.error; | ||
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| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
| import com.fasterxml.jackson.annotation.JsonTypeName; | ||
| import org.apache.druid.msq.util.MultiStageQueryContext; | ||
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| import java.util.Objects; | ||
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| @JsonTypeName(TooManyRowsInAWindowFault.CODE) | ||
| public class TooManyRowsInAWindowFault extends BaseMSQFault | ||
| { | ||
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| static final String CODE = "TooManyRowsInAWindow"; | ||
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| private final int numRows; | ||
| private final int maxRows; | ||
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| @JsonCreator | ||
| public TooManyRowsInAWindowFault( | ||
| @JsonProperty("numRows") final int numRows, | ||
| @JsonProperty("maxRows") final int maxRows | ||
| ) | ||
| { | ||
| super( | ||
| CODE, | ||
| "Too many rows in a window (requested = %d, max = %d). " | ||
| + " Try creating a window with a higher cardinality column or change the query shape." | ||
| + " Or you can change the max using query context param %s ." | ||
| + " Use it carefully as a higher value can lead to OutOfMemory errors. ", | ||
| numRows, | ||
| maxRows, | ||
| MultiStageQueryContext.MAX_ROWS_MATERIALIZED_IN_WINDOW | ||
| ); | ||
| this.numRows = numRows; | ||
| this.maxRows = maxRows; | ||
| } | ||
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| @JsonProperty | ||
| public int getNumRows() | ||
| { | ||
| return numRows; | ||
| } | ||
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| @JsonProperty | ||
| public int getMaxRows() | ||
| { | ||
| return maxRows; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) | ||
| { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| if (!super.equals(o)) { | ||
| return false; | ||
| } | ||
| TooManyRowsInAWindowFault that = (TooManyRowsInAWindowFault) o; | ||
| return numRows == that.numRows && maxRows == that.maxRows; | ||
| } | ||
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| @Override | ||
| public int hashCode() | ||
| { | ||
| return Objects.hash(super.hashCode(), numRows, maxRows); | ||
| } | ||
| } |
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