[GitHub] qiuchenjian commented on a change in pull request #3119: [DOC]Updated the documentation for a varchar scenario and compressor supported.

[GitBox <gi...@apache.org>]

qiuchenjian commented on a change in pull request #3119: [DOC]Updated the documentation for a varchar scenario and compressor supported.
URL: https://github.com/apache/carbondata/pull/3119#discussion_r252231518
 
 

 ##########
 File path: docs/faq.md
 ##########
 @@ -473,5 +474,28 @@ Note : Refrain from using "mvn clean package" without specifying the profile.
   **Procedure**
 
   A single column that can be considered as dimension is mandatory for table creation.
-
+  
+  ## Failed to execute select query on column having varchar datatype
+  
+  **Symptom**
+  
+  Execution fails with following exception
+  
+  ```
+  java.lang.RuntimeException: java.lang.RuntimeException: Cannot reserve additional contiguous bytes in the vectorized reader (requested 1839007356 bytes).
+  at org.apache.carbondata.core.datastore.chunk.impl.DimensionRawColumnChunk.convertToDimColDataChunkAndFillVector(DimensionRawColumnChunk.java:140)
+  at org.apache.carbondata.core.scan.scanner.LazyPageLoader.loadPage(LazyPageLoader.java:74)
+  at org.apache.spark.sql.CarbonVectorProxy$ColumnVectorProxyWithLazyLoad.checkPageLoaded(CarbonVectorProxy.java:511)
+  ```
+  **Possible Cause**
+  
+  JVM not able to reserve the contigous bytes in the the vectorized reader.
 
 Review comment:
   ```suggestion
     JVM  isn't able to reserve the contiguous bytes in the the vectorized reader.
   ```

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