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https://issues.apache.org/jira/browse/IMPALA-10350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltán Borók-Nagy updated IMPALA-10350:
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Summary: Impala loses double precision on the write side (was: Impala
loses double precision)
> Impala loses double precision on the write side
> -----------------------------------------------
>
> Key: IMPALA-10350
> URL: https://issues.apache.org/jira/browse/IMPALA-10350
> Project: IMPALA
> Issue Type: Bug
> Reporter: Zoltán Borók-Nagy
> Priority: Major
>
> Impala might loses presision of double values. Reproduction:
> {noformat}
> create table double_tbl (d double) stored as textfile;
> insert into double_tbl values (-0.43149576573887316);
> {noformat}
> Then inspect the data file:
> {noformat}
> $ hdfs dfs -cat
> /test-warehouse/double_tbl/424097c644088674-c55b910100000000_175064830_data.0.txt
> -0.4314957657388731{noformat}
> The same happens if we store our data in Parquet.
> Hive writes don't lose precision. Impala also loses precision on the read
> side even if the data is written by Hive.
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