capistrant commented on code in PR #19579: URL: https://github.com/apache/druid/pull/19579#discussion_r3423219628
########## processing/src/main/java/org/apache/druid/data/input/impl/ClusteredValueGroupsBaseTableProjectionSpec.java: ########## @@ -0,0 +1,345 @@ +/* + * 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.druid.data.input.impl; + +import com.fasterxml.jackson.annotation.JsonCreator; +import com.fasterxml.jackson.annotation.JsonIgnore; +import com.fasterxml.jackson.annotation.JsonInclude; +import com.fasterxml.jackson.annotation.JsonProperty; +import com.fasterxml.jackson.annotation.JsonTypeName; +import com.google.common.collect.Sets; +import org.apache.druid.error.DruidException; +import org.apache.druid.error.InvalidInput; +import org.apache.druid.java.util.common.granularity.Granularities; +import org.apache.druid.query.OrderBy; +import org.apache.druid.query.aggregation.AggregatorFactory; +import org.apache.druid.segment.VirtualColumns; +import org.apache.druid.segment.column.ColumnHolder; +import org.apache.druid.utils.CollectionUtils; + +import javax.annotation.Nullable; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.List; +import java.util.Objects; +import java.util.Set; + +/** + * {@link BaseTableProjectionSpec} for the clustered-value-groups base table mode: rows are partitioned into per-tuple + * "cluster groups" keyed by one or more typed clustering columns, optionally derived from {@link #virtualColumns}. + * Essentially, each group is stored as its own internal sub-segment.. + * <p> + * The operator declares a single ordered {@link #columns} list — the full set of columns in segment order, plus a + * {@link #clusteringColumns} list of NAMES designating the leading prefix of {@link #columns} that rows are + * clustered by. The time position is an explicit positional entry in {@link #columns} (named {@code __time}, or the + * query-granularity column {@link Granularities#GRANULARITY_VIRTUAL_COLUMN_NAME}); clustering by the time column is not + * yet supported, so the time marker must be a non-clustering column. A clustered base table is never rollup and has + * no metric columns. + * <p> + * {@link #getDimensionsSpec()} returns the unified spec built from {@link #columns} in declared order with + * {@code forceSegmentSortByTime=false}; {@link #getOrdering()} is computed as every column of {@link #columns} + * ascending, in list order. + * <p> + * Query granularity, when wanted, is just another entry in {@link #getVirtualColumns()} named + * {@link Granularities#GRANULARITY_VIRTUAL_COLUMN_NAME}; absent that virtual column the query granularity is + * {@code NONE}. Segment granularity and intervals live on the top-level + * {@link org.apache.druid.indexer.granularity.SegmentGranularitySpec}, not here. + */ +@JsonTypeName(ClusteredValueGroupsBaseTableProjectionSpec.TYPE_NAME) +public final class ClusteredValueGroupsBaseTableProjectionSpec implements BaseTableProjectionSpec +{ + public static final String TYPE_NAME = "clusteredValueGroups"; + + private final VirtualColumns virtualColumns; + private final List<DimensionSchema> columns; + private final List<String> clusteringColumns; + private final List<DimensionSchema> clusteringColumnSchemas; + private final List<DimensionSchema> nonClusteringColumnSchemas; + private final DimensionsSpec dimensionsSpec; + private final List<OrderBy> ordering; + + public static Builder builder() + { + return new Builder(); + } + + @JsonCreator + public ClusteredValueGroupsBaseTableProjectionSpec( + @JsonProperty("virtualColumns") @Nullable VirtualColumns virtualColumns, + @JsonProperty("columns") List<DimensionSchema> columns, + @JsonProperty("clusteringColumns") List<String> clusteringColumns + ) + { + validate(columns, clusteringColumns); + this.virtualColumns = virtualColumns == null ? VirtualColumns.EMPTY : virtualColumns; + this.columns = Collections.unmodifiableList(new ArrayList<>(columns)); + this.clusteringColumns = Collections.unmodifiableList(new ArrayList<>(clusteringColumns)); + this.clusteringColumnSchemas = this.columns.subList(0, this.clusteringColumns.size()); + this.nonClusteringColumnSchemas = this.columns.subList(this.clusteringColumns.size(), this.columns.size()); + this.dimensionsSpec = DimensionsSpec.builder() + .setDimensions(this.columns) + .setForceSegmentSortByTime(false) + .build(); + this.ordering = computeOrdering(this.columns); + } + + @Override + @JsonProperty + @JsonInclude(JsonInclude.Include.NON_DEFAULT) + public VirtualColumns getVirtualColumns() + { + return virtualColumns; + } + + /** + * The full, ordered list of columns in segment order; the clustering prefix followed by the remaining + * (non-clustering) columns, with the explicit {@code __time} (or query-granularity) marker at its declared + * position. + */ + @JsonProperty("columns") + public List<DimensionSchema> getColumns() + { + return columns; + } + + /** + * The names of the leading prefix of {@link #getColumns()} that rows are clustered by. + */ + @JsonProperty("clusteringColumns") + public List<String> getClusteringColumnNames() + { + return clusteringColumns; + } + + /** + * The clustering columns as {@link DimensionSchema}s; the leading prefix of {@link #getColumns()}. + */ + @JsonIgnore + public List<DimensionSchema> getClusteringColumns() + { + return clusteringColumnSchemas; + } + + /** + * The non-clustering columns as {@link DimensionSchema}s; the suffix of {@link #getColumns()} after the + * clustering prefix. Includes the explicit time marker. + */ + @JsonIgnore + public List<DimensionSchema> getNonClusteringColumns() + { + return nonClusteringColumnSchemas; + } + + @Override + public AggregatorFactory[] getMetrics() + { + return new AggregatorFactory[0]; + } + + @Override + @JsonIgnore + public List<OrderBy> getOrdering() + { + return ordering; + } + + @Override + @JsonIgnore + public DimensionsSpec getDimensionsSpec() + { + return dimensionsSpec; + } + + private static void validate(List<DimensionSchema> columns, List<String> clusteringColumns) Review Comment: could we eagerly validate clustering dimension types and throw InvalidInput exception using the DimensionSchema in `columns` for the relevant `clusteringColumns`? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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