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https://issues.apache.org/jira/browse/IMPALA-13018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17843304#comment-17843304
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Wenzhe Zhou edited comment on IMPALA-13018 at 5/3/24 6:32 PM:
--------------------------------------------------------------
In TPCDS table 'date_dim', column 'd_date' is defined to save date as string,
like "1900-01-0".
In the where clause of query q80a, 'd_date' is used to compare with timestamp
type of value as:
{code:java}
d_date between cast('2000-08-23' as timestamp) and (cast('2000-08-23' as
timestamp) + interval 30 days )
{code}
This cause RDBMS or remote Impala cluster return wrong data.
When changing the where clause of query q80a as following two formats:
{code:java}
d_date between cast('2000-08-23' as date) and (cast('2000-08-23' as date) +
interval 30 days )
cast(d_date as timestamp) between cast('2000-08-23' as timestamp) and
(cast('2000-08-23' as timestamp) + interval 30 days )
{code}
the query returns correct results.
It seems Impala can implicitly cast 'd_date' as timestamp string for non JDBC
tables.
was (Author: wzhou):
In TPCDS table 'date_dim', column 'd_date' is defined to save date as string,
like "1900-01-0".
In the where clause of query q80a, 'd_date' is used to compare with timestamp
type of value as:
{code:java}
d_date between cast('2000-08-23' as *timestamp*) and (cast('2000-08-23' as
*timestamp*) + interval 30 days )
{code}
This cause RDBMS or remote Impala cluster return wrong data.
When changing the where clause of query q80a as following two formats:
{code:java}
d_date between cast('2000-08-23' as *date*) and (cast('2000-08-23' as *date*) +
interval 30 days )
*cast(d_date as timestamp)* between cast('2000-08-23' as timestamp) and
(cast('2000-08-23' as timestamp) + interval 30 days )
{code}
the query returns correct results.
It seems Impala can implicitly cast 'd_date' as timestamp string for non JDBC
tables.
> Fix
> test_tpcds_queries.py/TestTpcdsQueryForJdbcTables.test_tpcdstpcds-decimal_v2-q80a
> failure
> ---------------------------------------------------------------------------------------------
>
> Key: IMPALA-13018
> URL: https://issues.apache.org/jira/browse/IMPALA-13018
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend, Frontend
> Reporter: Wenzhe Zhou
> Assignee: Pranav Yogi Lodha
> Priority: Major
>
> The returned rows are not matching expected results for some decimal type of
> columns.
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