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Subject [GitHub] [druid] gianm commented on a change in pull request #9301: Join filter pushdown initial implementation
Date Wed, 05 Feb 2020 02:31:37 GMT
gianm commented on a change in pull request #9301: Join filter pushdown initial implementation
URL: https://github.com/apache/druid/pull/9301#discussion_r375007877
 
 

 ##########
 File path: processing/src/main/java/org/apache/druid/segment/join/JoinFilterAnalyzer.java
 ##########
 @@ -0,0 +1,743 @@
+/*
+ * 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.segment.join;
+
+import com.google.common.collect.ImmutableList;
+import it.unimi.dsi.fastutil.ints.IntList;
+import org.apache.druid.math.expr.Expr;
+import org.apache.druid.query.dimension.DimensionSpec;
+import org.apache.druid.query.filter.Filter;
+import org.apache.druid.query.filter.InDimFilter;
+import org.apache.druid.query.filter.ValueMatcher;
+import org.apache.druid.segment.ColumnSelectorFactory;
+import org.apache.druid.segment.ColumnValueSelector;
+import org.apache.druid.segment.DimensionSelector;
+import org.apache.druid.segment.NilColumnValueSelector;
+import org.apache.druid.segment.VirtualColumn;
+import org.apache.druid.segment.column.ColumnCapabilities;
+import org.apache.druid.segment.column.ValueType;
+import org.apache.druid.segment.filter.AndFilter;
+import org.apache.druid.segment.filter.Filters;
+import org.apache.druid.segment.filter.InFilter;
+import org.apache.druid.segment.filter.OrFilter;
+import org.apache.druid.segment.filter.SelectorFilter;
+import org.apache.druid.segment.join.lookup.LookupColumnSelectorFactory;
+import org.apache.druid.segment.join.lookup.LookupJoinable;
+import org.apache.druid.segment.join.table.IndexedTable;
+import org.apache.druid.segment.join.table.IndexedTableJoinable;
+import org.apache.druid.segment.virtual.ExpressionVirtualColumn;
+
+import javax.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+
+public class JoinFilterAnalyzer
+{
+  private static final String PUSH_DOWN_VIRTUAL_COLUMN_NAME_BASE = "JOIN-FILTER-PUSHDOWN-VIRTUAL-COLUMN-";
+  private static final ColumnSelectorFactory ALL_NULL_COLUMN_SELECTOR_FACTORY = new AllNullColumnSelectorFactory();
+
+  public static JoinFilterSplit splitFilter(
+      HashJoinSegmentStorageAdapter hashJoinSegmentStorageAdapter,
 
 Review comment:
   Skimming a bit, it seems like this would work if it was given a `List<JoinableClause>`
instead of a `HashJoinSegmentStorageAdapter`. If so, that'd be a good change (it's better
for methods like this to take conceptually smaller objects — unit testing is easier, and
it makes it clearer what the 'real' dependencies are of the computation it is doing).

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