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https://issues.apache.org/jira/browse/DRILL-4862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15436495#comment-15436495
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Khurram Faraaz commented on DRILL-4862:
---------------------------------------
Query plan for failing query
{noformat}
0: jdbc:drill:schema=dfs.tmp> explain plan for select
convert_from(binary_string(key),'UTF8') from `f1.json` where
convert_from(binary_string(key),'UTF8') is not null;
+------+------+
| text | json |
+------+------+
| 00-00 Screen
00-01 Project(EXPR$0=[CONVERT_FROMUTF8(BINARY_STRING($0))])
00-02 SelectionVectorRemover
00-03 Filter(condition=[IS NOT NULL(CONVERT_FROM(BINARY_STRING($0),
'UTF8'))])
00-04 Scan(groupscan=[EasyGroupScan
[selectionRoot=maprfs:/tmp/f1.json, numFiles=1, columns=[`key`],
files=[maprfs:///tmp/f1.json]]])
{noformat}
> 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
>
> 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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