Adds support for compute JSON from dictionary. JSON data can now be computed from its dictionary/ index, with an option to skip storing the raw JSON entirely

processing/src/main/java/org/apache/druid/query/rowsandcols/concrete/ColumnHolderRACColumn.java

@@ -19,14 +19,13 @@
 
 package org.apache.druid.query.rowsandcols.concrete;
 
-import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector;
 import org.apache.druid.query.rowsandcols.column.Column;
 import org.apache.druid.query.rowsandcols.column.ColumnAccessor;
 import org.apache.druid.segment.ColumnValueSelector;
 import org.apache.druid.segment.column.BaseColumn;
 import org.apache.druid.segment.column.BaseColumnHolder;
 import org.apache.druid.segment.column.ColumnType;
-import org.apache.druid.segment.data.ReadableOffset;
+import org.apache.druid.segment.data.AtomicIntegerReadableOffset;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -161,26 +160,4 @@ public BaseColumn getBaseColumn()
     }
     return baseColumn;
   }
-
-  private static class AtomicIntegerReadableOffset implements ReadableOffset
-  {
-    private final AtomicInteger offset;
-
-    public AtomicIntegerReadableOffset(AtomicInteger offset)
-    {
-      this.offset = offset;
-    }
-
-    @Override
-    public int getOffset()
-    {
-      return offset.get();
-    }
-
-    @Override
-    public void inspectRuntimeShape(RuntimeShapeInspector inspector)
-    {
-
-    }
-  }
 }

processing/src/main/java/org/apache/druid/segment/data/AtomicIntegerReadableOffset.java

@@ -0,0 +1,49 @@
+/*
+ * 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.data;
+
+import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * A {@link ReadableOffset} implementation that wraps an AtomicInteger.
+ */
+public class AtomicIntegerReadableOffset implements ReadableOffset
+{
+  private final AtomicInteger offset;
+
+  public AtomicIntegerReadableOffset(AtomicInteger offset)
+  {
+    this.offset = offset;
+  }
+
+  @Override
+  public int getOffset()
+  {
+    return offset.get();
+  }
+
+  @Override
+  public void inspectRuntimeShape(RuntimeShapeInspector inspector)
+  {
+
+  }
+}