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https://issues.apache.org/jira/browse/IMPALA-12925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenzhe Zhou updated IMPALA-12925:
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Description:
The data types in unit-test table alltypes do not include decimal. The data
type of column partsupp.ps_supplycost is decimal(12,2).
Create an external JDBC table to query table tpch.partsupp on remote Impala
cluster. Select statement on the JDBC table return wrong values for column
partsupp.ps_supplycost. Lots of returned values are negative.
Decimal type is listed as supported primitive data type in
DataSourceTable.java(https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/catalog/DataSourceTable.java#L153).
But it seems the data type is not handled properly which cause wrong value
returned from DataSourceScanNode.
Another issue is that the decimal data type is not handled in
DataSourceScanNode.java
(https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/planner/DataSourceScanNode.java#L152)
so that decimal type of predicates cannot be pushed down.
was:
The data types in unit-test table alltypes do not include decimal. The data
type of column partsupp.ps_supplycost is decimal(12,2).
Create an external JDBC table to query table tpch.partsupp on remote Impala
cluster. Select statement on the JDBC table return wrong values for column
partsupp.ps_supplycost. Lots of returned values are negative.
Decimal type is listed as supported primitive data type in
DataSourceTable.java(https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/catalog/DataSourceTable.java#L153).
But it seems the data type is not handled properly.
Another issue is that the decimal data type is not handled in
DataSourceScanNode.java
(https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/planner/DataSourceScanNode.java#L152)
so that decimal type of predicates cannot be pushed down.
> Support decimal data type for external JDBC table
> -------------------------------------------------
>
> Key: IMPALA-12925
> URL: https://issues.apache.org/jira/browse/IMPALA-12925
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Reporter: Wenzhe Zhou
> Assignee: gaurav singh
> Priority: Major
>
> The data types in unit-test table alltypes do not include decimal. The data
> type of column partsupp.ps_supplycost is decimal(12,2).
> Create an external JDBC table to query table tpch.partsupp on remote Impala
> cluster. Select statement on the JDBC table return wrong values for column
> partsupp.ps_supplycost. Lots of returned values are negative.
> Decimal type is listed as supported primitive data type in
> DataSourceTable.java(https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/catalog/DataSourceTable.java#L153).
> But it seems the data type is not handled properly which cause wrong value
> returned from DataSourceScanNode.
> Another issue is that the decimal data type is not handled in
> DataSourceScanNode.java
> (https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/planner/DataSourceScanNode.java#L152)
> so that decimal type of predicates cannot be pushed down.
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