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https://issues.apache.org/jira/browse/SQOOP-3451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16938609#comment-16938609
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Denes Bodo commented on SQOOP-3451:
-----------------------------------
Thanks for you answers [~mbalakrishnan] and [~fero]. I'll create a proposal
change soon considering your suggestion.
> Importing FLOAT from Oracle to Hive results in INTEGER
> ------------------------------------------------------
>
> Key: SQOOP-3451
> URL: https://issues.apache.org/jira/browse/SQOOP-3451
> Project: Sqoop
> Issue Type: Bug
> Components: codegen, connectors/oracle, hive-integration
> Affects Versions: 1.4.7
> Reporter: Denes Bodo
> Priority: Major
>
> We ran into an issue where there is a table created in Oracle 11g:
> {noformat}
> create table floattest (column1 float(30), column2 number(30,-127), column3
> number(30));
> {noformat}
> We want to import date from Oracle to Hive:
> {noformat}
> sqoop import -D
> mapred.child.java.opts='-Djava.security.egd=file:/dev/../dev/urandom'
> -Dmapreduce.job.queuename=default --connect
> "jdbc:oracle:thin:@DBHOST:1521/xe" --username sqoop --password sqoop --table
> floattest --hcatalog-database default --hcatalog-table floattest
> --create-hcatalog-table --hcatalog-external-table --hcatalog-storage-stanza
> "stored as orc" -m 1 --columns COLUMN1,COLUMN2,COLUMN3 --verbose
> {noformat}
> In Sqoop logs we see the following:
> {noformat}
> 19/09/24 13:51:45 INFO manager.SqlManager: Executing SQL statement: SELECT
> t.* FROM floattest t WHERE 1=0
> 19/09/24 13:51:45 DEBUG manager.SqlManager: Found column COLUMN1 of type [2,
> 30, -127]
> 19/09/24 13:51:45 DEBUG manager.SqlManager: Found column COLUMN2 of type [2,
> 30, -84]
> 19/09/24 13:51:45 DEBUG manager.SqlManager: Found column COLUMN3 of type [2,
> 30, 0]
> 19/09/24 13:51:45 INFO hcat.SqoopHCatUtilities: Database column names
> projected : [COLUMN1, COLUMN2, COLUMN3]
> 19/09/24 13:51:45 INFO hcat.SqoopHCatUtilities: Database column name - info
> map :
> COLUMN3 : [Type : 2,Precision : 30,Scale : 0]
> COLUMN2 : [Type : 2,Precision : 30,Scale : -84]
> COLUMN1 : [Type : 2,Precision : 30,Scale : -127]
> 19/09/24 13:51:45 INFO hcat.SqoopHCatUtilities: Creating HCatalog table
> default.floattest for import
> 19/09/24 13:51:45 INFO hcat.SqoopHCatUtilities: HCatalog Create table
> statement:
> create external table `default`.`floattest` (
> `column1` decimal(30),
> `column2` decimal(30),
> `column3` decimal(30))
> stored as orc
> {noformat}
> From this output we can see that Oracle states about column1 has Type=2 which
> is NUMERIC (regarding to
> https://docs.oracle.com/javase/7/docs/api/constant-values.html#java.sql.Types.FLOAT).
> Sqoop translates NUMERIC to DECIMAL
> (https://github.com/apache/sqoop/blob/trunk/src/java/org/apache/sqoop/mapreduce/hcat/SqoopHCatUtilities.java#L1050L1107).
> Due to Oracle uses {{scale=-127}} to sign about a NUMERIC that it is a FLOAT
> instead of stating {{Type=6}}, Sqoop creates integers (decimal with 0 scale)
> from NUMBER.
> I think it is the fault of Oracle as it does not use Java Type=6 to sign type
> of a float. What do you think?
> ----
> Thank you for the details and investigation to [~mbalakrishnan] and Andrew
> Miller
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