Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20450#discussion_r165242508
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/vectorized/ColumnarMap.java ---
@@ -0,0 +1,53 @@
+/*
+ * 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.spark.sql.vectorized;
+
+import org.apache.spark.sql.catalyst.util.MapData;
+
+/**
+ * Map abstraction in {@link ColumnVector}.
+ */
+public final class ColumnarMap extends MapData {
+ private final ColumnarArray keys;
+ private final ColumnarArray values;
+ private final int length;
+
+ public ColumnarMap(ColumnVector keys, ColumnVector values, int offset,
int length) {
+ this.length = length;
+ this.keys = new ColumnarArray(keys, offset, length);
+ this.values = new ColumnarArray(values, offset, length);
+ }
+
+ @Override
+ public int numElements() { return length; }
--- End diff --
This is a API from parent, we can change it.
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