[GitHub] [druid] github-code-scanning[bot] commented on a diff in pull request #13927: Introduce SQL interface for distinct count extension

["github-code-scanning[bot] (via GitHub)" <gi...@apache.org>]

github-code-scanning[bot] commented on code in PR #13927:
URL: https://github.com/apache/druid/pull/13927#discussion_r1139282636


##########
extensions-contrib/distinctcount/src/main/java/org/apache/druid/query/aggregation/distinctcount/sql/SegmentDistinctSqlAggregator.java:
##########
@@ -0,0 +1,157 @@
+/*
+ * 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.query.aggregation.distinctcount.sql;
+
+import org.apache.calcite.rel.core.AggregateCall;
+import org.apache.calcite.rel.core.Project;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rex.RexBuilder;
+import org.apache.calcite.rex.RexNode;
+import org.apache.calcite.sql.SqlAggFunction;
+import org.apache.calcite.sql.SqlFunctionCategory;
+import org.apache.calcite.sql.SqlKind;
+import org.apache.calcite.sql.type.InferTypes;
+import org.apache.calcite.sql.type.OperandTypes;
+import org.apache.calcite.sql.type.ReturnTypes;
+import org.apache.calcite.sql.type.SqlTypeFamily;
+import org.apache.calcite.sql.type.SqlTypeName;
+import org.apache.calcite.util.Optionality;
+import org.apache.druid.java.util.common.ISE;
+import org.apache.druid.query.aggregation.AggregatorFactory;
+import org.apache.druid.query.aggregation.distinctcount.DistinctCountAggregatorFactory;
+import org.apache.druid.query.dimension.DefaultDimensionSpec;
+import org.apache.druid.query.dimension.DimensionSpec;
+import org.apache.druid.segment.column.ColumnType;
+import org.apache.druid.segment.column.RowSignature;
+import org.apache.druid.segment.column.ValueType;
+import org.apache.druid.sql.calcite.aggregation.Aggregation;
+import org.apache.druid.sql.calcite.aggregation.SqlAggregator;
+import org.apache.druid.sql.calcite.expression.DruidExpression;
+import org.apache.druid.sql.calcite.expression.Expressions;
+import org.apache.druid.sql.calcite.planner.Calcites;
+import org.apache.druid.sql.calcite.planner.PlannerContext;
+import org.apache.druid.sql.calcite.rel.VirtualColumnRegistry;
+
+import javax.annotation.Nullable;
+import java.util.List;
+
+
+
+public class SegmentDistinctSqlAggregator implements SqlAggregator
+{
+  private static final SqlAggFunction FUNCTION_INSTANCE = new SegmentDistinctAggFunction();
+  private static final String NAME = "SEGMENT_DISTINCT";
+
+  @Override
+  public SqlAggFunction calciteFunction()
+  {
+    return FUNCTION_INSTANCE;
+  }
+
+  @Nullable
+  @Override
+  public Aggregation toDruidAggregation(
+          PlannerContext plannerContext,
+          RowSignature rowSignature,
+          VirtualColumnRegistry virtualColumnRegistry,
+          RexBuilder rexBuilder,
+          String name,
+          AggregateCall aggregateCall,
+          Project project,
+          List<Aggregation> list,
+          boolean finalizeAggregations)
+  {
+
+    // Don't use Aggregations.getArgumentsForSimpleAggregator, since it won't let us use direct column access
+    // for string columns.
+    final RexNode columnRexNode = Expressions.fromFieldAccess(
+        rowSignature,
+        project,
+        aggregateCall.getArgList().get(0)
+    );

Review Comment:
   ## Deprecated method or constructor invocation
   
   Invoking [Expressions.fromFieldAccess](1) should be avoided because it has been deprecated.
   
   [Show more details](https://github.com/apache/druid/security/code-scanning/4400)



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