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https://issues.apache.org/jira/browse/DRILL-4862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15714205#comment-15714205
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Khurram Faraaz commented on DRILL-4862:
---------------------------------------

Verified, tests are added here 
framework/resources/Functional/convert/drill_4862*.q

> wrong results - use of convert_from(binary_string(key),'UTF8') in filter 
> results in wrong results
> -------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-4862
>                 URL: https://issues.apache.org/jira/browse/DRILL-4862
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>    Affects Versions: 1.8.0
>         Environment: 4 node cluster CentOS
>            Reporter: Khurram Faraaz
>            Assignee: Chunhui Shi
>             Fix For: 1.9.0
>
>
> These results do not look right, i.e when the predicate has 
> convert_from(binary_string(key),'UTF8')
> Apache drill 1.8.0-SNAPSHOT git commit ID: 57dc9f43
> {noformat}
> [root@centos-0x drill4478]# cat f1.json
> {"key":"\\x30\\x31\\x32\\x33"}
> {"key":"\\x34\\x35\\x36\\x37"}
> {"key":"\\x38\\x39\\x30\\x31"}
> {"key":"\\x30\\x30\\x30\\x30"}
> {"key":"\\x31\\x31\\x31\\x31"}
> {"key":"\\x35\\x35\\x35\\x35"}
> {"key":"\\x38\\x38\\x38\\x38"}
> {"key":"\\x39\\x39\\x39\\x39"}
> {"key":"\\x41\\x42\\x43\\x44"}
> {"key":"\\x45\\x46\\x47\\x48"}
> {"key":"\\x49\\x41\\x44\\x46"}
> {"key":"\\x4a\\x4b\\x4c\\x4d"}
> {"key":"\\x57\\x58\\x59\\x5a"}
> {"key":"\\x4e\\x4f\\x50\\x51"}
> {"key":"\\x46\\x46\\x46\\x46"}
> {noformat}
> results without the predicate - these are correct results
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> select convert_from(binary_string(key),'UTF8') 
> from `f1.json`;
> +---------+
> | EXPR$0  |
> +---------+
> | 0123    |
> | 4567    |
> | 8901    |
> | 0000    |
> | 1111    |
> | 5555    |
> | 8888    |
> | 9999    |
> | ABCD    |
> | EFGH    |
> | IADF    |
> | JKLM    |
> | WXYZ    |
> | NOPQ    |
> | FFFF    |
> +---------+
> 15 rows selected (0.256 seconds)
> {noformat}
> results with a predicate - these results don't look correct
> {noformat}
> 0: jdbc:drill:schema=dfs.tmp> select convert_from(binary_string(key),'UTF8') 
> from `f1.json` where convert_from(binary_string(key),'UTF8') is not null;
> +----------+
> |  EXPR$0  |
> +----------+
> | 0123123  |
> | 4567567  |
> | 8901901  |
> | 0000000  |
> | 1111111  |
> | 5555555  |
> | 8888888  |
> | 9999999  |
> | ABCDBCD  |
> | EFGHFGH  |
> | IADFADF  |
> | JKLMKLM  |
> | WXYZXYZ  |
> | NOPQOPQ  |
> | FFFFFFF  |
> +----------+
> 15 rows selected (0.279 seconds)
> {noformat}



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