Github user jinfengni commented on a diff in the pull request:

    https://github.com/apache/drill/pull/805#discussion_r117582970
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScan.java
 ---
    @@ -508,21 +516,32 @@ public void populatePruningVector(ValueVector v, int 
index, SchemaPath column, S
             NullableVarBinaryVector varBinaryVector = 
(NullableVarBinaryVector) v;
             Object s = partitionValueMap.get(f).get(column);
             byte[] bytes;
    -        if (s instanceof Binary) {
    -          bytes = ((Binary) s).getBytes();
    -        } else if (s instanceof String) {
    -          bytes = ((String) s).getBytes();
    -        } else if (s instanceof byte[]) {
    -          bytes = (byte[]) s;
    +        if (s == null) {
    +          varBinaryVector.getMutator().setNull(index);
    +          return;
             } else {
    -          throw new UnsupportedOperationException("Unable to create column 
data for type: " + type);
    +          bytes = getBytes(type, s);
             }
             varBinaryVector.getMutator().setSafe(index, bytes, 0, 
bytes.length);
             return;
           }
           case DECIMAL18: {
             NullableDecimal18Vector decimalVector = (NullableDecimal18Vector) 
v;
    -        Long value = (Long) partitionValueMap.get(f).get(column);
    +        Object s = partitionValueMap.get(f).get(column);
    --- End diff --
    
    If the patch also changes DECIMAL18's partition pruning, please modify the 
title of JIRA to reflect such change. 


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