[HOTFIX] Fix select query on varchar column with large data fails wit…

…h jvm crash

Problem : When select query fired on varchar column having large data it results in JVM crash because when when we increase the ReusableBuffer by 30% the new size gets gets reduced because requestSize * 30 gets out of range for int which gives a negative value and the total size gets reduced.

Solution : While assigning the size to ByteBuffer we first check if total size less than the requested size then we pass requested size to to the ByteBuffer.

This closes #3104

core/src/main/java/org/apache/carbondata/core/constants/CarbonCommonConstants.java

@@ -1386,6 +1386,13 @@ private CarbonCommonConstants() {
    */
   public static final int CARBON_DYNAMIC_ALLOCATION_SCHEDULER_THREAD_SLEEP_TIME = 250;
 
+  /**
+   * We increment the requested page size by 30% only if the requested size is less than 10MB.
+   * Otherwise we take the original requested page size.This parameter will be used till the
+   * size based page implementation comes in carbon.
+   */
+  public static final int REQUESTED_PAGE_SIZE_MAX = 10485760;
+
   /**
    * It allows queries on hive metastore directly along with filter information, otherwise first
    * fetches all partitions from hive and apply filters on it.

core/src/main/java/org/apache/carbondata/core/datastore/ReusableDataBuffer.java

@@ -19,6 +19,7 @@
 
 import org.apache.carbondata.common.annotations.InterfaceAudience;
 import org.apache.carbondata.common.annotations.InterfaceStability;
+import org.apache.carbondata.core.constants.CarbonCommonConstants;
 
 /**
  * class holds the reusable data buffer based on request it will resize.
@@ -47,7 +48,13 @@ public class ReusableDataBuffer {
    */
   public byte[] getDataBuffer(int requestedSize) {
     if (dataBuffer == null || requestedSize > size) {
-      this.size = requestedSize + ((requestedSize * 30) / 100);
+      // increase by 30% only if the requestedSize less than 10 MB
+      // otherwise take the original requestedSize.
+      if (requestedSize < CarbonCommonConstants.REQUESTED_PAGE_SIZE_MAX) {
+        this.size = requestedSize + ((requestedSize * 30) / 100);
+      } else {
+        this.size = requestedSize;
+      }
       dataBuffer = new byte[size];
     }
     return dataBuffer;