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Posted to issues@spark.apache.org by "Xiao Li (JIRA)" <ji...@apache.org> on 2018/01/09 01:22:00 UTC
[jira] [Reopened] (SPARK-21646) Add new type coercion rules to
compatible with Hive
[ https://issues.apache.org/jira/browse/SPARK-21646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiao Li reopened SPARK-21646:
-----------------------------
> Add new type coercion rules to compatible with Hive
> ---------------------------------------------------
>
> Key: SPARK-21646
> URL: https://issues.apache.org/jira/browse/SPARK-21646
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Yuming Wang
> Attachments: Type_coercion_rules_to_compatible_with_Hive.pdf
>
>
> How to reproduce:
> hive:
> {code:sql}
> $ hive -S
> hive> create table spark_21646(c1 string, c2 string);
> hive> insert into spark_21646 values('92233720368547758071', 'a');
> hive> insert into spark_21646 values('21474836471', 'b');
> hive> insert into spark_21646 values('10', 'c');
> hive> select * from spark_21646 where c1 > 0;
> 92233720368547758071 a
> 10 c
> 21474836471 b
> hive>
> {code}
> spark-sql:
> {code:sql}
> $ spark-sql -S
> spark-sql> select * from spark_21646 where c1 > 0;
> 10 c
> spark-sql> select * from spark_21646 where c1 > 0L;
> 21474836471 b
> 10 c
> spark-sql> explain select * from spark_21646 where c1 > 0;
> == Physical Plan ==
> *Project [c1#14, c2#15]
> +- *Filter (isnotnull(c1#14) && (cast(c1#14 as int) > 0))
> +- *FileScan parquet spark_21646[c1#14,c2#15] Batched: true, Format: Parquet, Location: InMemoryFileIndex[viewfs://cluster4/user/hive/warehouse/spark_21646], PartitionFilters: [], PushedFilters: [IsNotNull(c1)], ReadSchema: struct<c1:string,c2:string>
> spark-sql>
> {code}
> As you can see, spark auto cast c1 to int type, if this value out of integer range, the result is different from Hive.
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