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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4764) Parquet file with INT_16, etc. logical types not supported by simple SELECT
Date Fri, 02 Dec 2016 18:34:58 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15715900#comment-15715900

ASF GitHub Bot commented on DRILL-4764:

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

    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/columnreaders/ParquetFixedWidthDictionaryReaders.java
    @@ -56,6 +58,31 @@ protected void readField(long recordsToReadInThisPass) {
    --- End diff --
    What about NullableDictionaryUint types?
    Also, It is probably a good idea to create a single parquet file with columns of all combinations
of these types, 
    Nullable, dictionary encoded, signed and unsigned int2, int4, int8 types and a single
unit test to read that file.

> Parquet file with INT_16, etc. logical types not supported by simple SELECT
> ---------------------------------------------------------------------------
>                 Key: DRILL-4764
>                 URL: https://issues.apache.org/jira/browse/DRILL-4764
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Data Types
>    Affects Versions: 1.6.0
>            Reporter: Paul Rogers
>            Assignee: Parth Chandra
>         Attachments: int_16.parquet, int_8.parquet, uint_16.parquet, uint_32.parquet,
> Create a Parquet file with the following schema:
> message int16Data { required int32 index; required int32 value (INT_16); }
> Store it as int_16.parquet in the local file system. Query it with:
> SELECT * from `local`.`root`.`int_16.parquet`;
> The result, in the web UI, is this error:
> org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR: UnsupportedOperationException:
unsupported type: INT32 INT_16 Fragment 0:0 [Error Id: c63f66b4-e5a9-4a35-9ceb-546b74645dd4
> The INT_16 logical (or "original") type simply tells consumers of the file that the data
is actually a 16-bit signed int. Presumably, this should tell Drill to use the SmallIntVector
(or NullableSmallIntVector) class for storage. Without supporting this annotation, even 16-bit
integers must be stored as 32-bits within Drill.

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