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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/04/29 13:25:00 UTC
[jira] [Work logged] (BEAM-9840) Support for Parameterized Types
when converting from HCatRecords to Rows in HCatalogIO
[ https://issues.apache.org/jira/browse/BEAM-9840?focusedWorklogId=428561&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-428561 ]
ASF GitHub Bot logged work on BEAM-9840:
----------------------------------------
Author: ASF GitHub Bot
Created on: 29/Apr/20 13:24
Start Date: 29/Apr/20 13:24
Worklog Time Spent: 10m
Work Description: rahul8383 opened a new pull request #11569:
URL: https://github.com/apache/beam/pull/11569
…Records to Rows in HCatalogIO
char and varchar types in HcatRecord requires the length of the character sequence to be provided as a parameter.
serdeConstants only specifies the base name of the type. So, serdeConstants cannot be used to convert "char(10)" and "varchar(100)" to Beam Fieldtype.STRING.
This PR converts the FieldSchema to HCatFieldSchema and the Type enum defined in HCatFieldSchema is used to convert the FieldSchema to Beam Schema.
Decimal type can optionally be provided with precision and scale as parameters while defining the type. Using HCatFieldSchema will take care of converting "decimal(30,16)" type to FieldType.DECIMAL type.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 428561)
Remaining Estimate: 0h
Time Spent: 10m
> Support for Parameterized Types when converting from HCatRecords to Rows in HCatalogIO
> --------------------------------------------------------------------------------------
>
> Key: BEAM-9840
> URL: https://issues.apache.org/jira/browse/BEAM-9840
> Project: Beam
> Issue Type: Improvement
> Components: io-java-hcatalog
> Reporter: Rahul Patwari
> Assignee: Rahul Patwari
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In Hive, to use CHAR and VARCHAR as the data type for a column, the types have to be parameterized with the length of the character sequence. Refer [https://github.com/apache/hive/blob/f37c5de6c32b9395d1b34fa3c02ed06d1bfbf6eb/serde/src/test/org/apache/hadoop/hive/serde2/typeinfo/TestTypeInfoUtils.java#L68]
> In addition, for the DECIMAL data type, custom precision and scale can be provided as parameters.
> A user has faced an Exception while reading data from a table created in Hive with a parameterized DECIMAL data type. Refer [https://lists.apache.org/thread.html/r159012fbefce24d734096e3ec24ecd112de5f89b8029e57147d233b0%40%3Cuser.beam.apache.org%3E].
> This ticket is created to support converting from HcatRecords to Rows when the HCatRecords have parameterized types.
> To Support Parameterized data types, we can make use of HcatFieldSchema. Refer [https://github.com/apache/hive/blob/f37c5de6c32b9395d1b34fa3c02ed06d1bfbf6eb/hcatalog/core/src/main/java/org/apache/hive/hcatalog/data/schema/HCatFieldSchema.java#L34]
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