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From "Ramana Inukonda Nagaraj (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2267) Parquet writer with dictionary encoding results in corrupted varchar columns
Date Wed, 18 Feb 2015 21:24:11 GMT
Ramana Inukonda Nagaraj created DRILL-2267:
----------------------------------------------

             Summary: Parquet writer with dictionary encoding results in corrupted varchar
columns
                 Key: DRILL-2267
                 URL: https://issues.apache.org/jira/browse/DRILL-2267
             Project: Apache Drill
          Issue Type: Bug
          Components: Storage - Parquet
            Reporter: Ramana Inukonda Nagaraj
            Assignee: Steven Phillips


Using CTAS created a parquet file through drill having the varchar datatype.

Created parquet file looks like this through parquet-tools 
VARCHAR_col:         OPTIONAL BINARY O:UTF8 R:0 D:1
VAR16CHAR_col:       OPTIONAL BINARY O:UTF8 R:0 D:1

VARCHAR_col:          BINARY SNAPPY DO:0 FPO:894307 SZ:16344/231716/14.18 VC:378624 ENC:RLE,PLAIN_DICTIONARY,BIT_PACKED
VAR16CHAR_col:        BINARY SNAPPY DO:0 FPO:910651 SZ:25830/381493/14.77 VC:378624 ENC:RLE,PLAIN_DICTIONARY,BIT_PACKED

On querying the file several records show up having corrupted data for these fields.

| VAR16CHAR_col |
+---------------+
| ������������  |
|               |
| ��������      |
| �����         |
| ��   |
|          |
|           |
| ��        |
| ������������  |
|               |
| ��������      |
| �����         |
| ��   |
|          |
|           |
| ��        |
| ������������  |
|               |
| ��������      |
| �����         |
| ��   |
|          |
|           |
| ��        |
| ������������  |
|               |
| ��������      |
| �����         |
| ��   |
|          |
|           |
| ��        |
| ������������  |
|               |
| ��������      |
| �����         |
| ��   |

If dictionary encoding is turned off the resultant file can be read without these issues.





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